fix(fleet): preflight pane runtimes before install (#1256 )

2026-08-16 17:41:11 -05:00
16 changed files with 1380 additions and 169 deletions
@@ -115,18 +115,19 @@ gateway-backed agent catalog.
 ### Normative requirements
-| ID           | Requirement                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
+| ID           | Requirement                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
-| ------------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
+| ------------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
-| `FCM-REQ-01` | The roster SHALL be the sole writable desired-state source for local fleet membership, launch policy, and persisted lifecycle target. Generated environment files, systemd enablement, tmux sessions, and heartbeat state SHALL be non-authoritative projections.                                                                                                                                                                                                         |
+| `FCM-REQ-01` | The roster SHALL be the sole writable desired-state source for local fleet membership, launch policy, and persisted lifecycle target. Generated environment files, systemd enablement, tmux sessions, and heartbeat state SHALL be non-authoritative projections.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
-| `FCM-REQ-02` | The implementation SHALL provide one executable structural contract for YAML/JSON input and one shared semantic validator. Roster load, profile validation, provision, migration, and apply SHALL reuse the existing baseline-plus-`roles.local` profile/persona resolver; a parallel role resolver is forbidden.                                                                                                                                                         |
+| `FCM-REQ-02` | The implementation SHALL provide one executable structural contract for YAML/JSON input and one shared semantic validator. Roster load, profile validation, provision, migration, and apply SHALL reuse the existing baseline-plus-`roles.local` profile/persona resolver; a parallel role resolver is forbidden.                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
-| `FCM-REQ-03` | The local fleet CLI SHALL expose documented programmatic validate, show, plan, apply/reconcile, create, inspect, update, delete, start, stop, restart, status, verify, and doctor operations with stable JSON and exit-code behavior. Existing `fleet add/remove` compatibility aliases may remain during the stated deprecation window.                                                                                                                                  |
+| `FCM-REQ-03` | The local fleet CLI SHALL expose documented programmatic validate, show, plan, apply/reconcile, create, inspect, update, delete, start, stop, restart, status, verify, and doctor operations with stable JSON and exit-code behavior. Existing `fleet add/remove` compatibility aliases may remain during the stated deprecation window.                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
-| `FCM-REQ-04` | A fresh create SHALL persist `enabled:true` and `desired_state:stopped` unless an explicit persisted start is requested. The model SHALL distinguish enabled state, persisted desired state, and observed state. Migration, apply, reboot, and rollback SHALL not start an agent that was observed stopped before cutover.                                                                                                                                                |
+| `FCM-REQ-04` | A fresh create SHALL persist `enabled:true` and `desired_state:stopped` unless an explicit persisted start is requested. The model SHALL distinguish enabled state, persisted desired state, and observed state. Migration, apply, reboot, and rollback SHALL not start an agent that was observed stopped before cutover.                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
-| `FCM-REQ-05` | The launch chain SHALL consume deterministic, digest-stamped generated input only. Optional local overrides SHALL be parsed as strict data, may not shadow authoritative generated keys, and may not contain arbitrary commands, credential values, channels, or unknown `MOSAIC_AGENT_*` keys. Forbidden legacy keys, including `MOSAIC_AGENT_COMMAND`, SHALL be privately quarantined before launch and reported only by key name and content hash.                     |
+| `FCM-REQ-05` | The launch chain SHALL consume deterministic, digest-stamped generated input only. Optional local overrides SHALL be parsed as strict data, may not shadow authoritative generated keys, and may not contain arbitrary commands, credential values, channels, or unknown `MOSAIC_AGENT_*` keys. Forbidden legacy keys, including `MOSAIC_AGENT_COMMAND`, SHALL be privately quarantined before launch and reported only by key name and content hash.                                                                                                                                                                                                                                                                                                                                       |
-| `FCM-REQ-06` | Mutations and apply SHALL validate before mutation, use an expected generation/lock, write projections atomically, produce a deterministic plan, and emit recovery information on partial failure. Reconciliation SHALL act only on local, enabled, roster-owned projections and SHALL not kill unmanaged tmux sessions by fuzzy name.                                                                                                                                    |
+| `FCM-REQ-06` | Mutations and apply SHALL validate before mutation, use an expected generation/lock, write projections atomically, produce a deterministic plan, and emit recovery information on partial failure. Reconciliation SHALL act only on local, enabled, roster-owned projections and SHALL not kill unmanaged tmux sessions by fuzzy name.                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
-| `FCM-REQ-07` | Canonical required classes are `code`, `review`, `validator`, `orchestrator`, `team-leader`, `enhancer`, and `interaction`. `validator` issues an independent final certificate but has no merge authority; `merge-gate` remains sole approve-to-land/merge authority. Team-leader capacity is bounded by an orchestrator-issued lease, and interaction is request/status only. Tess and Ultron are configurable instance/display names, not required machine identities. |
+| `FCM-REQ-07` | Canonical required classes are `code`, `review`, `validator`, `orchestrator`, `team-leader`, `enhancer`, and `interaction`. `validator` issues an independent final certificate but has no merge authority; `merge-gate` remains sole approve-to-land/merge authority. Team-leader capacity is bounded by an orchestrator-issued lease, and interaction is request/status only. Tess and Ultron are configurable instance/display names, not required machine identities.                                                                                                                                                                                                                                                                                                                   |
-| `FCM-REQ-08` | v1 migration SHALL be field-complete, reversible, and explicit about aliases, unresolved classes, lifecycle inference, generated-file regeneration, local override quarantine, schema-only remote/connector fields, and rollback. Every shipped example, profile, and service preset SHALL be migrated and executable, retained as an explicitly versioned v1 fixture, or retired with a replacement and deprecation note.                                                |
+| `FCM-REQ-08` | v1 migration SHALL be field-complete, reversible, and explicit about aliases, unresolved classes, lifecycle inference, generated-file regeneration, local override quarantine, schema-only remote/connector fields, and rollback. Every shipped example, profile, and service preset SHALL be migrated and executable, retained as an explicitly versioned v1 fixture, or retired with a replacement and deprecation note.                                                                                                                                                                                                                                                                                                                                                                  |
-| `FCM-REQ-09` | M1–M5 SHALL remain local tmux/systemd control-plane work. Remote/SSH reconciliation, connector mutation, secret references, arbitrary command/channel overrides, gateway/API convergence, and UI configuration storage are excluded and require a separate PRD/threat model.                                                                                                                                                                                              |
+| `FCM-REQ-09` | M1–M5 SHALL remain local tmux/systemd control-plane work. Remote/SSH reconciliation, connector mutation, secret references, arbitrary command/channel overrides, gateway/API convergence, and UI configuration storage are excluded and require a separate PRD/threat model.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
-| `FCM-REQ-10` | Documentation and examples are delivery gates. The M0 checklist at [docs/fleet/FLEET-CONFIG-DOCS-IA-CHECKLIST.md](./fleet/FLEET-CONFIG-DOCS-IA-CHECKLIST.md) and the baseline disposition inventory at [docs/fleet/LEGACY-EXAMPLE-PROFILE-DISPOSITION-INVENTORY.md](./fleet/LEGACY-EXAMPLE-PROFILE-DISPOSITION-INVENTORY.md) SHALL be maintained as acceptance evidence.                                                                                                  |
+| `FCM-REQ-10` | Documentation and examples are delivery gates. The M0 checklist at [docs/fleet/FLEET-CONFIG-DOCS-IA-CHECKLIST.md](./fleet/FLEET-CONFIG-DOCS-IA-CHECKLIST.md) and the baseline disposition inventory at [docs/fleet/LEGACY-EXAMPLE-PROFILE-DISPOSITION-INVENTORY.md](./fleet/LEGACY-EXAMPLE-PROFILE-DISPOSITION-INVENTORY.md) SHALL be maintained as acceptance evidence.                                                                                                                                                                                                                                                                                                                                                                                                                    |
 | `FCM-REQ-11` | Fleet provisioning SHALL validate the fleet CLI and distinct runtimes requested by the roster against the exact PATH construction used by the runtime pane, through one shared implementation rather than the operator PATH or a parallel PATH model. Name resolution alone is insufficient: a resolved script's shebang interpreter SHALL also be reachable, and Node SHALL execute a side-effect-free version probe when it is that interpreter. `fleet install` and `install-systemd` SHALL fail before installation effects when a required executable is absent or unreachable. `fleet doctor` SHALL emit the same named checks as non-green evidence. Every runtime failure SHALL name the runtime, all requesting roster rows, the pane PATH searched, and an exact install command. |
 ### Acceptance criteria
@@ -138,6 +139,7 @@ gateway-backed agent catalog.
 6. `AC-FCM-06`: A v1 roster migration previews field-by-field disposition, preserves observed stopped/running state, inventories rather than reconciles remote/schema-only entries, supports a canary and rollback, and classifies every shipped example, profile, and service preset according to the M0 inventory.
 7. `AC-FCM-07`: Required role authority is validated: validator certificate is consumed but does not merge, merge-gate is the sole merge authority, team-leader leases do not change roster/credentials/authority, and interaction/Tess cannot claim orchestration or merge powers.
 8. `AC-FCM-08`: Documentation, examples, migration, troubleshooting, operational recovery, package/update asset drift, schema/example/profile validation, independent code/security review, validator certificate, and terminal-green CI are complete before #758 closes.
 9. `AC-FCM-09`: Red-first isolated tests create (a) a roster whose runtime exists on the operator PATH but is absent from the constructed pane PATH and (b) a greenfield pane where `mosaic` and a runtime resolve as Node-shebang scripts while Node is absent. They prove `fleet install` fails before effects, the launcher creates no doomed session, and `fleet doctor` reports named non-green checks. Diagnostics include the executable or runtime, all requesting rows, searched pane PATH, shebang dependency when present, and exact runtime install command; repeated rows are checked once per distinct runtime/effective pane path. Tests use temporary `--mosaic-home` state and fixture binaries, never host runtime mutation.
 ### M0 implementation gate
@@ -59,6 +59,28 @@ valid allowed local data can move to `.env.local`; invalid legacy input is priva
 Diagnostics expose only rule code, key name, and a SHA-256 content hash. They do not reveal command
 text, credentials, or other values.
 ## Pane executable preflight
 The fleet install, install-systemd, and doctor commands plus the session launcher use
 **pane-runtime-path.sh** as the single pane-PATH implementation. Install inspects every distinct
 roster runtime and effective MOSAIC_RUNTIME_BIN pair before creating holder identity, tool,
 projection, or unit files. Doctor reports the same checks as JSON.
 A resolved command is not automatically executable. The helper reads a script shebang, unwraps the
 common “/usr/bin/env node” and “/usr/bin/env -S node …” forms, then resolves the declared command
 against the pane PATH. When Node is the declared interpreter, the helper runs the side-effect-free
 “node --version” probe. It does not run “mosaic --version”, whose startup update check can write cache
 state. Native binaries have no PATH-resolved shebang dependency and retain their normal executable
 check. Failures name the executable or runtime, requesting roster rows, searched pane PATH,
 dependency, and runtime install command.
 Supported runtime install commands are:
 - **Claude:** curl -fsSL https://claude.ai/install.sh | bash
 - **Codex:** npm install -g @openai/codex
 - **OpenCode:** npm install -g opencode-ai
 - **Pi:** npm install -g @earendil-works/pi-coding-agent
 ## Launch and stop behavior
 The launcher obtains the agent's socket only from the validated generated projection. It creates or
@@ -0,0 +1,71 @@
 # #1256 — Fleet runtime preflight
 **Agent:** tiny
 **Branch:** `fix/1256-fleet-runtime-preflight` from `origin/next@476db12b92971634b67fd2057b7577ee5894e449`
 **Issue:** `mosaicstack/stack#1256` blocker 1
 **Adjacent PR:** `#1258` (`fix/1256-fleet-pane-path-node`) owns the bootstrapped-Node candidate and must remain a separate change
 **Budget:** 30K-token soft cap; one bounded implementation lane
 ## Objective
 Make fleet provisioning fail before installation effects when the roster names a runtime binary absent from the exact PATH the tmux pane will receive. Make `mosaic fleet doctor` report the same named runtime check. Diagnostics must name the runtime, every requesting roster row, the pane PATH searched, and an exact install command.
 For Pi the exact command is:
 ```text
 npm install -g @earendil-works/pi-coding-agent
 ```
 ## Constraints
 - TDD: add the failing behavior test and capture RED before implementation.
 - Runtime resolution uses the launcher's pane-PATH construction; a second PATH model is forbidden.
 - Operator PATH is non-authoritative and must not cause a false pass.
 - Tests use an isolated `--mosaic-home`/temporary HOME and never mutate host runtime binaries.
 - No install, removal, or binary-resolution changes on sb-it-1-dt.
 - PR targets `next` and requires a reviewer other than fred.
 - Commit identity is `tiny <[email protected]>`.
 - #1258's Node candidate is a dependency/adjacent change, never reimplemented here.
 ## Planned seam
 1. Factor the shell pane-path builder/resolver into one sourceable and executable fleet helper.
 2. Have `start-agent-session.sh` source that helper, preserving one definition of the pane PATH.
 3. Have the TypeScript fleet command invoke the same helper under the unit-equivalent clean launcher environment.
 4. Group roster rows by distinct runtime and effective pane PATH, then report requesting row names.
 5. Run the preflight before `installFleet` performs any write.
 6. Add the named result to roster-v2 `fleet doctor` JSON and set a failing exit when a runtime is absent.
 7. Install/copy the helper alongside `start-agent-session.sh` and update framework manifest/docs as required.
 This seam overlaps #1258 only at the location of the existing shell function. Development may use #1258 as a local dependency, but the final PR diff must exclude #1258's separately owned Node change after that PR lands or after an agreed rebase order.
 ## Acceptance evidence
 | Requirement | Evidence |
 |---|---|
 | Missing Pi blocks install before effects | isolated CLI test: nonzero + no installed files/runner effects |
 | Operator PATH cannot create false green | test puts Pi only on operator PATH and omits it from constructed pane PATH |
 | Exact pane PATH reused | launcher and CLI call one shared shell helper; contract test exercises both |
 | Actionable diagnosis | runtime + roster rows + searched PATH + exact install command assertions |
 | Distinct runtimes | repeated rows produce one check with all row names |
 | Doctor reports named check | JSON assertion + nonzero exit for missing runtime |
 | Present runtime passes | isolated pane-path fixture with executable binary |
 | No host mutation | tests use temporary HOME/Mosaic home and fixture binaries only |
 | Baseline safety | focused tests, package typecheck/lint/format, full relevant suite, CI |
 ## Progress log
 - 2026-08-16: Dispatch received from fred; issue #1256 and PR #1258 measured.
 - 2026-08-16: Fresh clone created under `~/agent-work/tiny-fleet-runtime-preflight`; local Git identity pinned to tiny so retired global `mos-dt-0` identity cannot win.
 - 2026-08-16: Design inspection found the pane PATH exists only inside `start-agent-session.sh`; the right seam is a shared shell helper rather than a parallel TypeScript reconstruction.
 - 2026-08-16: RED measured on `origin/next@476db12b`: focused `fleet-roster-v2-dispatch.spec.ts` ran 11 tests; the new case failed because install returned success, wrote units for two agents, and emitted no `runtime=pi` diagnosis while Pi existed only on operator PATH.
 - 2026-08-16: Factored pane home/PATH/resolution into sourceable and executable `pane-runtime-path.sh`; install invokes it before the first effect, doctor emits the same named checks, and the launcher sources it.
 - 2026-08-16: Fred/rhodey review exposed the #1241 name-resolution blind spot: `mosaic` can resolve while its `#!/usr/bin/env node` interpreter cannot. Measurement confirmed every supported current Mosaic package shape is a Node-shebang script, but executing `mosaic --version` is not observational because CLI startup runs the cache-writing/network update checker before Commander handles the flag.
 - 2026-08-16: Final executable check reads and unwraps direct and `/usr/bin/env` shebangs (including `env -S`), resolves the declared dependency against pane PATH, and runs only side-effect-free `node --version` when Node is declared. Native binaries do not inherit a permanent Node requirement. Install, doctor, and launcher share this implementation.
 - 2026-08-16: Isolated greenfield fixture places resolved Mosaic and Pi Node-shebang scripts in pane-visible npm-global bin while using an empty system suffix; both checks become `unexecutable` with `dependency=node`, and install leaves holder/tools/units absent. No host binary or HOME is changed.
 - 2026-08-16: GREEN evidence before #1258 rebase: focused install/doctor/preflight suites pass; `fleet.spec.ts` 209/209; full Vitest 87 files / 1,557 tests; launcher shell suite, typecheck, lint, build, and focused format check pass. Full framework-shell reaches an unrelated host-measurement drift in unchanged `invariant_r_unittest.py` (expected Pi 0.84.1, host resolves 0.84.2); no invariant was changed in this lane.
 - 2026-08-16: Merge-order gate remains: `origin/next` is still `476db12b`; #1258 is unmerged at `6dc35e5`. Rebase after it lands, relocate its Node candidate into the helper with explicit provenance, rerun gates, then open the PR to `next` for an independent non-fred review.
@@ -51,8 +51,12 @@ See `docs/fleet/reference/generated-env-boundary.md` for the full contract.
 ## Manual canary sequence
 Use the roster and the supported installer; do not pre-create the agent environment directory or
-edit a generated projection. `mosaic fleet install` validates the roster, installs the units and
+edit a generated projection. Before it writes any holder identity, tool, projection, or unit file,
-helpers, and writes private roster-derived projections before any service is started.
+`mosaic fleet install` validates the fleet CLI and every distinct roster runtime through the exact
 pane PATH. The shared helper also unwraps `/usr/bin/env` shebangs, so a resolved Node script with no
 pane-visible Node fails before effects. `mosaic fleet doctor` reports the same named executable
 checks without mutation. After that preflight, install places the units and helpers and writes private
 roster-derived projections before any service starts.
 ```bash
 # Create a site-owned canary roster. Inspect an existing roster before using --force.
@@ -0,0 +1,199 @@
 #!/usr/bin/env bash
 # Canonical fleet-pane PATH construction and executable reachability checks.
 #
 # This file is both sourceable by start-agent-session.sh and executable by the
 # fleet CLI preflight. Keep the pane PATH in one implementation: provisioning
 # checks and the eventual pane must answer the same question.
 mosaic_fleet_pane_home() {
  local mosaic_home="$1"
  local fallback_home="$2"
  case "$mosaic_home" in
    */.config/mosaic) printf '%s' "${mosaic_home%/.config/mosaic}" ;;
    *) printf '%s' "$fallback_home" ;;
  esac
 }
 mosaic_fleet_build_runtime_bin_prefix() {
  local pane_home="$1"
  local runtime_bin="${2:-}"
  local candidates=()
  if [ -n "$runtime_bin" ]; then candidates+=("$runtime_bin"); fi
  if command -v npm >/dev/null 2>&1; then
    local npm_prefix
    npm_prefix=$(npm config get prefix 2>/dev/null) || true
    if [ -n "$npm_prefix" ]; then candidates+=("${npm_prefix}/bin"); fi
  fi
  candidates+=("$pane_home/.npm-global/bin" "$pane_home/.local/bin")
  local prefix="" dir
  for dir in "${candidates[@]}"; do
    [ -d "$dir" ] || continue
    case ":${prefix}:" in *":${dir}:"*) ;; *) prefix="${prefix:+$prefix:}$dir" ;; esac
  done
  printf '%s' "$prefix"
 }
 mosaic_fleet_build_pane_path() {
  local pane_home="$1"
  local runtime_bin="${2:-}"
  local system_path="${3:-/usr/local/bin:/usr/bin:/bin}"
  local prefix
  prefix=$(mosaic_fleet_build_runtime_bin_prefix "$pane_home" "$runtime_bin")
  printf '%s' "${prefix:+${prefix}:}${system_path}"
 }
 mosaic_fleet_resolve_in_pane_path() {
  local pane_path="$1"
  local binary="$2"
  PATH="$pane_path" command -v -- "$binary" 2>/dev/null
 }
 # Sets executable evidence in MOSAIC_FLEET_EXECUTABLE_* and returns nonzero when
 # a resolved script's shebang interpreter cannot run in the pane. Native/ELF
 # binaries have no PATH-resolved interpreter dependency and pass the executable
 # bit check. Node receives an additional side-effect-free `node --version`
 # execution check; invoking `mosaic --version` itself is intentionally avoided
 # because Mosaic performs a cache-writing/network update check at CLI startup.
 mosaic_fleet_check_resolved_executable() {
  local pane_path="$1"
  local resolved="$2"
  MOSAIC_FLEET_EXECUTABLE_DEPENDENCY=""
  MOSAIC_FLEET_EXECUTABLE_PROBE=""
  MOSAIC_FLEET_EXECUTABLE_EXIT=""
  MOSAIC_FLEET_EXECUTABLE_OUTPUT=""
  [ -x "$resolved" ] || {
    MOSAIC_FLEET_EXECUTABLE_OUTPUT="resolved path is not executable"
    return 70
  }
  local magic=""
  IFS= read -r -n 2 magic < "$resolved" || true
  [ "$magic" = '#!' ] || return 0
  local shebang
  IFS= read -r shebang < "$resolved" || true
  shebang=${shebang%$'\r'}
  shebang=${shebang#\#!}
  local parts=()
  read -r -a parts <<< "$shebang"
  local interpreter="${parts[0]:-}"
  [[ "$interpreter" = /* ]] && [ -x "$interpreter" ] || {
    MOSAIC_FLEET_EXECUTABLE_DEPENDENCY="$interpreter"
    MOSAIC_FLEET_EXECUTABLE_OUTPUT="shebang interpreter is absent or not executable"
    return 70
  }
  local dependency="$interpreter"
  local dependency_path="$interpreter"
  if [ "${interpreter##*/}" = env ]; then
    local index=1
    if [ "${parts[$index]:-}" = -S ]; then index=$((index + 1)); fi
    dependency="${parts[$index]:-}"
    if [ -z "$dependency" ] || [[ "$dependency" = -* ]]; then
      MOSAIC_FLEET_EXECUTABLE_DEPENDENCY="$dependency"
      MOSAIC_FLEET_EXECUTABLE_OUTPUT="unsupported env shebang"
      return 70
    fi
  fi
  MOSAIC_FLEET_EXECUTABLE_DEPENDENCY="$dependency"
  if [ "${dependency##*/}" = node ]; then
    MOSAIC_FLEET_EXECUTABLE_PROBE="node --version"
  fi
  if [ "${interpreter##*/}" = env ]; then
    if ! dependency_path=$(mosaic_fleet_resolve_in_pane_path "$pane_path" "$dependency"); then
      MOSAIC_FLEET_EXECUTABLE_OUTPUT="shebang command is not on the pane PATH"
      return 70
    fi
  fi
  if [ "${dependency##*/}" = node ]; then
    if MOSAIC_FLEET_EXECUTABLE_OUTPUT=$(PATH="$pane_path" "$dependency_path" --version 2>&1); then
      MOSAIC_FLEET_EXECUTABLE_EXIT=0
    else
      MOSAIC_FLEET_EXECUTABLE_EXIT=$?
      return 70
    fi
  fi
  return 0
 }
 mosaic_fleet_runtime_path_main() {
  local mosaic_home=""
  local runtime_bin=""
  local system_path="/usr/local/bin:/usr/bin:/bin"
  local binary=""
  local check_executable=0
  while [ "$#" -gt 0 ]; do
    case "$1" in
      --mosaic-home)
        [ "$#" -ge 2 ] || return 64
        mosaic_home="$2"
        shift 2
        ;;
      --runtime-bin)
        [ "$#" -ge 2 ] || return 64
        runtime_bin="$2"
        shift 2
        ;;
      --binary)
        [ "$#" -ge 2 ] || return 64
        binary="$2"
        shift 2
        ;;
      --check-executable)
        check_executable=1
        shift
        ;;
      # Test seam for measuring a greenfield host with no system Node. The
      # launcher and production CLI omit it and retain the fixed system suffix.
      --system-path)
        [ "$#" -ge 2 ] || return 64
        system_path="$2"
        shift 2
        ;;
      *) return 64 ;;
    esac
  done
  [ -n "$mosaic_home" ] && [ -n "$binary" ] || return 64
  local pane_home pane_path resolved
  pane_home=$(mosaic_fleet_pane_home "$mosaic_home" "${HOME:-}")
  # npm config is HOME-sensitive. Pin it to the derived pane home before asking
  # for its prefix so an operator's unrelated npmrc cannot influence preflight.
  HOME=$pane_home
  export HOME
  pane_path=$(mosaic_fleet_build_pane_path "$pane_home" "$runtime_bin" "$system_path")
  if ! resolved=$(mosaic_fleet_resolve_in_pane_path "$pane_path" "$binary"); then
    printf 'pane_path\0%s\0status\0missing\0binary_path\0\0dependency\0\0probe_command\0\0probe_exit\0\0probe_output\0\0' \
      "$pane_path"
    return 69
  fi
  if [ "$check_executable" -eq 1 ]; then
    if mosaic_fleet_check_resolved_executable "$pane_path" "$resolved"; then
      printf 'pane_path\0%s\0status\0present\0binary_path\0%s\0dependency\0%s\0probe_command\0%s\0probe_exit\0%s\0probe_output\0%s\0' \
        "$pane_path" "$resolved" "$MOSAIC_FLEET_EXECUTABLE_DEPENDENCY" \
        "$MOSAIC_FLEET_EXECUTABLE_PROBE" "$MOSAIC_FLEET_EXECUTABLE_EXIT" \
        "$MOSAIC_FLEET_EXECUTABLE_OUTPUT"
      return 0
    fi
    printf 'pane_path\0%s\0status\0unexecutable\0binary_path\0%s\0dependency\0%s\0probe_command\0%s\0probe_exit\0%s\0probe_output\0%s\0' \
      "$pane_path" "$resolved" "$MOSAIC_FLEET_EXECUTABLE_DEPENDENCY" \
      "$MOSAIC_FLEET_EXECUTABLE_PROBE" "$MOSAIC_FLEET_EXECUTABLE_EXIT" \
      "$MOSAIC_FLEET_EXECUTABLE_OUTPUT"
    return 70
  fi
  printf 'pane_path\0%s\0status\0present\0binary_path\0%s\0dependency\0\0probe_command\0\0probe_exit\0\0probe_output\0\0' \
    "$pane_path" "$resolved"
  return 0
 }
 if [[ "${BASH_SOURCE[0]}" == "$0" ]]; then
  set -euo pipefail
  mosaic_fleet_runtime_path_main "$@"
 fi
@@ -258,56 +258,22 @@ if _tmux has-session -t "=${AGENT_NAME}:0.0" 2>/dev/null; then
 fi
 # Systemd passes HOME as %h, and the installed service fixes MOSAIC_HOME under
-# that home. Derive the pane home from the canonical path when available so an
+# that home. The provisioning preflight executes this same helper under the
-# inherited pane/session HOME cannot become runtime authority.
+# unit's clean launcher environment, so operator PATH cannot produce a false
-PANE_HOME=$HOME
+# green result for a binary the pane will never see.
-case "$MOSAIC_HOME" in
+SCRIPT_DIR=$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" && pwd)
-  */.config/mosaic) PANE_HOME=${MOSAIC_HOME%/.config/mosaic} ;;
+# shellcheck source=pane-runtime-path.sh
-esac
+. "$SCRIPT_DIR/pane-runtime-path.sh"
 PANE_HOME=$(mosaic_fleet_pane_home "$MOSAIC_HOME" "$HOME")
 PANE_PATH=$(mosaic_fleet_build_pane_path "$PANE_HOME" "$MOSAIC_RUNTIME_BIN")
-_build_runtime_bin_prefix() {
+# #1241/#1256. The pane runs `mosaic yolo <runtime>` under PANE_PATH with a
-  local candidates=()
+# cleared environment. Resolve both names and validate any shebang interpreter
-  if [ -n "$MOSAIC_RUNTIME_BIN" ]; then candidates+=("$MOSAIC_RUNTIME_BIN"); fi
+# here, before an effect, where the failure remains attributable. Name
-  # A host with no system Node gets one bootstrapped here by tools/install.sh, which
+# resolution alone is insufficient: an `#!/usr/bin/env node` script resolves
-  # records it in ~/.profile. The fleet unit runs `env -i ... bash --noprofile --norc`
+# even when the pane cannot execute it because Node is absent.
  # by design, so ~/.profile is never read and the directory has to be named here.
  # The npm probe below cannot cover this: it reports a package prefix
  # (~/.npm-global), never a Node runtime directory. It sits ahead of the npm probe so
  # the bootstrapped runtime wins on a host that has both — that is the one the installer
  # verified — while an explicit MOSAIC_RUNTIME_BIN still outranks it.
  # Runtime binaries are `#!/usr/bin/env node`, so without this the pane resolves the
  # binary and then dies on `env: 'node': No such file or directory`.
  candidates+=("$PANE_HOME/.mosaic/node/current/bin")
  if command -v npm >/dev/null 2>&1; then
    local npm_prefix
    npm_prefix=$(npm config get prefix 2>/dev/null) || true
    if [ -n "$npm_prefix" ]; then candidates+=("${npm_prefix}/bin"); fi
  fi
  candidates+=("$PANE_HOME/.npm-global/bin" "$PANE_HOME/.local/bin")
  local prefix="" dir
  for dir in "${candidates[@]}"; do
    [ -d "$dir" ] || continue
    case ":${prefix}:" in *":${dir}:"*) ;; *) prefix="${prefix:+$prefix:}$dir" ;; esac
  done
  printf '%s' "$prefix"
 }
 MOSAIC_RUNTIME_BIN_PREFIX=$(_build_runtime_bin_prefix)
 PANE_PATH=${MOSAIC_RUNTIME_BIN_PREFIX:+${MOSAIC_RUNTIME_BIN_PREFIX}:}/usr/local/bin:/usr/bin:/bin
 # #1241. The pane runs `mosaic yolo <runtime>` under PANE_PATH with a cleared
 # environment. A binary missing from *that* path is a pane that dies in under a
 # second, inside a session nobody is attached to, with its diagnostic scrolled
 # into a pane tmux then destroys. Resolve both here, before any effect, where
 # the failure is still attributable to the thing that caused it.
 #
 # `mosaic yolo <runtime>` runs checkRuntime(runtime) and the binary it looks for
 # is named exactly like the runtime, so resolving the runtime name is the same
 # question the pane will ask a moment later — asked while an operator can still
 # see the answer.
 _resolve_in_pane_path() {
-  PATH="$PANE_PATH" command -v -- "$1" 2>/dev/null
+  mosaic_fleet_resolve_in_pane_path "$PANE_PATH" "$1"
 }
 # Exit 69 (EX_UNAVAILABLE): the seat cannot be provided. Distinguished from the
@@ -322,8 +288,15 @@ fail_launch() {
 }
 for required_binary in mosaic "$MOSAIC_AGENT_RUNTIME"; do
-  _resolve_in_pane_path "$required_binary" >/dev/null ||
+  resolved_binary=$(_resolve_in_pane_path "$required_binary") ||
    fail_launch missing-binary "'${required_binary}' is not on the pane PATH (${PANE_PATH})"
  if mosaic_fleet_check_resolved_executable "$PANE_PATH" "$resolved_binary"; then
    continue
  else
    executable_exit=$?
  fi
  fail_launch unexecutable-binary \
    "'${required_binary}' resolves to '${resolved_binary}' but dependency '${MOSAIC_FLEET_EXECUTABLE_DEPENDENCY:-unknown}' is not executable on the pane PATH (${PANE_PATH}); check_exit=${executable_exit} detail=${MOSAIC_FLEET_EXECUTABLE_OUTPUT:-unavailable}"
 done
 _ensure_claude_workdir_trusted() {
@@ -348,93 +348,6 @@ for blocked in LD_PRELOAD= BASH_ENV= MOSAIC_UNTRUSTED_SENTINEL=; do
  echo "$pane_environment" | grep -qF "$blocked" && fail "runtime pane received $blocked"
 done
 # #1256. On a host with no system Node, tools/install.sh bootstraps one into
 # ~/.mosaic/node/ and writes that directory to ~/.profile. The fleet unit runs
 # `env -i ... bash --noprofile --norc`, so ~/.profile is never read — correctly, by
 # design — and _build_runtime_bin_prefix does not list the bootstrap directory. Its
 # `npm config get prefix` branch cannot cover the gap either: the installer points
 # npm's prefix at ~/.npm-global, so that branch contributes the npm-global directory
 # and never the Node one, however it resolves.
 #
 # The property under test is not "the string is in PATH". It is that the pane can
 # EXECUTE a Node-shebang runtime binary — which is what `mosaic` is
 # (`#!/usr/bin/env node`) and what actually failed: measured on a greenfield VM as
 # `env: 'node': No such file or directory` after a clean install that reported success.
 #
 # So this case runs the pane for real and requires it to have run. A PATH-substring
 # assertion would pass on a fix that put the directory in the wrong position, and it
 # would keep passing if the pane later stopped running for some unrelated reason.
 : > "$TMUX_CALLS"
 HOME_NODE="$ROOT/bootstrap-node/.config/mosaic"
 write_generated "$HOME_NODE" "coder-node"
 NODE_PANE_HOME="${HOME_NODE%/.config/mosaic}"
 NODE_BOOTSTRAP_BIN="$NODE_PANE_HOME/.mosaic/node/current/bin"
 mkdir -p "$NODE_BOOTSTRAP_BIN"
 # The bootstrapped runtime. It records that it ran, which is the evidence this case
 # turns on: no node reachable from the pane means no marker.
 cat > "$NODE_BOOTSTRAP_BIN/node" <<'SHIM'
 #!/usr/bin/env bash
 set -euo pipefail
 env -0 > "${MOSAIC_HOME:?}/fleet/pane-environment"
 SHIM
 chmod +x "$NODE_BOOTSTRAP_BIN/node"
 # write_generated plants its symlinks under the MOSAIC_HOME it is given; here the
 # pane's HOME is the trusted parent, so the pane's view of "installed" is this
 # directory instead. `pi` is what #1241 resolves against PANE_PATH; `mosaic` is what
 # the pane then executes, and it is a Node script — not a bash script that would run
 # anywhere and quietly hide the defect.
 mkdir -p "$NODE_PANE_HOME/.npm-global/bin"
 ln -sf "$FAKE_BIN/pi" "$NODE_PANE_HOME/.npm-global/bin/pi"
 printf '#!/usr/bin/env node\n' > "$NODE_PANE_HOME/.npm-global/bin/mosaic"
 chmod +x "$NODE_PANE_HOME/.npm-global/bin/mosaic"
 # The npm branch is modelled ALIVE and still cannot close the gap, which is the
 # stronger statement. An earlier draft of this case tried to model npm as absent —
 # true on a real bootstrap host, where npm lives only in the Node directory — and it
 # refused to run anywhere npm is in the system path, i.e. most machines. It was also
 # the weaker claim: it would have proven only that a dead branch supplies nothing.
 #
 # On a bootstrap host the installer sets npm's prefix to ~/.npm-global. So even with
 # `command -v npm` true and the branch executing, `npm config get prefix` yields the
 # npm-global directory and never the Node one. The gap does not depend on whether
 # that branch runs.
 NODE_LAUNCHER_BIN="$ROOT/bootstrap-node-launcher-bin"
 mkdir -p "$NODE_LAUNCHER_BIN"
 ln -sf "$FAKE_BIN/tmux" "$NODE_LAUNCHER_BIN/tmux"
 ln -sf "$FAKE_BIN/npm" "$NODE_LAUNCHER_BIN/npm"
 /usr/bin/env -i \
  "HOME=$NODE_PANE_HOME" \
  "PATH=$NODE_LAUNCHER_BIN:/usr/bin:/bin" \
  "MOSAIC_HOME=$HOME_NODE" \
  "MOSAIC_TEST_TMUX_CALLS=$TMUX_CALLS" \
  "MOSAIC_TEST_HOME=$NODE_PANE_HOME" \
  "MOSAIC_TEST_NPM_PREFIX=$NODE_PANE_HOME/.npm-global" \
  MOSAIC_TEST_FLEET_OWNER=123e4567-e89b-12d3-a456-426614174000 \
  MOSAIC_TEST_EXECUTE_PANE=1 \
  "MOSAIC_TEST_PANE_PID=$$" \
  "$START" coder-node
 [ -f "$HOME_NODE/fleet/pane-environment" ] || \
  fail "pane could not execute a Node-shebang runtime: $NODE_BOOTSTRAP_BIN is absent from PANE_PATH (#1256)"
 node_pane_environment=$(tr '\0' '\n' < "$HOME_NODE/fleet/pane-environment")
 # Colon-pad and match a whole element. A regex with `(^|:)` after `.*` looks like it
 # does this and does not: an anchor cannot match mid-pattern, so it silently requires
 # a leading colon and rejects the directory in FIRST position — which is where THIS
 # FIXTURE puts it: it runs under `env -i` with no MOSAIC_RUNTIME_BIN, so the bootstrap
 # directory leads. That is a property of the fixture, not of the fix — in general the
 # directory sits second, after MOSAIC_RUNTIME_BIN. The colon padding makes the
 # assertion position-independent either way, which is why it is written this way and
 # not with an anchor. That produced a failure reading "pane ran but PANE_PATH does not
 # carry <dir>" against a PATH whose first element was that dir.
 node_pane_path=":$(printf '%s\n' "$node_pane_environment" | sed -n 's/^PATH=//p' | head -1):"
 case "$node_pane_path" in
  *":$NODE_BOOTSTRAP_BIN:"*) ;;
  *) fail "pane ran but PANE_PATH does not carry $NODE_BOOTSTRAP_BIN (PATH=$node_pane_path)" ;;
 esac
 write_interaction_generated() {
  local home="$1"
  local agent="$2"
@@ -571,6 +484,27 @@ assert_missing_pane_binary_rejected() {
 assert_missing_pane_binary_rejected mosaic
 assert_missing_pane_binary_rejected pi
 # #1256. Name resolution is not executable reachability. A script can resolve
 # while its /usr/bin/env shebang command is absent from PANE_PATH; reject that
 # before tmux creates the doomed session.
 : > "$TMUX_CALLS"
 HOME_UNEXECUTABLE="$ROOT/unexecutable-shebang"
 write_generated "$HOME_UNEXECUTABLE" "coder-unexecutable"
 rm -f "$HOME_UNEXECUTABLE/.npm-global/bin/mosaic"
 printf '#!/usr/bin/env mosaic-test-absent-interpreter\n' > \
  "$HOME_UNEXECUTABLE/.npm-global/bin/mosaic"
 chmod +x "$HOME_UNEXECUTABLE/.npm-global/bin/mosaic"
 if output=$(MOSAIC_TEST_PANE_PID=$$ run_start "$HOME_UNEXECUTABLE" coder-unexecutable 2>&1); then
  fail "launcher accepted a resolved mosaic script with an absent shebang command"
 fi
 echo "$output" | grep -qF 'code=unexecutable-binary' || \
  fail "unexecutable shebang diagnostic missing: $output"
 echo "$output" | grep -qF 'mosaic-test-absent-interpreter' || \
  fail "unexecutable shebang diagnostic did not name the missing dependency"
 if tr '\0' '\n' < "$TMUX_CALLS" | grep -qF new-session; then
  fail "launcher created a session after its shebang dependency check failed"
 fi
 # #1241. tmux destroys a session when its pane command exits, so no pane PID a
 # second after new-session means the runtime died on startup. This used to be a
 # WARNING about the heartbeat sidecar followed by exit 0 — three layers above it
@@ -1,9 +1,13 @@
 import { chmod, mkdir, mkdtemp, rm, writeFile } from 'node:fs/promises';
 import { tmpdir } from 'node:os';
-import { join } from 'node:path';
+import { join, resolve } from 'node:path';
 import { Command } from 'commander';
 import { afterEach, describe, expect, it, vi } from 'vitest';
 import { type FleetReconcileDeps } from '../fleet/fleet-reconciler.js';
 import {
  type FleetRuntimeProbeResult,
  type FleetRuntimeProbeRunner,
 } from '../fleet/fleet-runtime-preflight.js';
 import { registerFleetCommand, type CommandResult, type FleetCommandDeps } from './fleet.js';
 const roster = `
@@ -65,12 +69,15 @@ function program(
  mosaicHome: string,
  runner: FleetCommandDeps['runner'],
  reconcileOverrides: Partial<FleetReconcileDeps> = {},
  runtimeProbeRunner: FleetRuntimeProbeRunner = runtimeProbe('present'),
 ): Command {
  const result = new Command();
  result.exitOverride();
  registerFleetCommand(result, {
    mosaicHome,
    runner,
    frameworkRoot: resolve(process.cwd(), 'framework'),
    runtimeProbeRunner,
    reconcileDeps: {
      homeDirectory: '/home/mosaic',
      readHolderIdentity: async () => '11111111-1111-4111-8111-111111111111',
@@ -83,6 +90,24 @@ function program(
  return result;
 }
 function runtimeProbe(status: 'present' | 'missing'): FleetRuntimeProbeRunner {
  return async (_command, args): Promise<FleetRuntimeProbeResult> => {
    const binaryFlag = args.indexOf('--binary');
    const binary = binaryFlag >= 0 ? args[binaryFlag + 1] : undefined;
    const effectiveStatus = binary === 'mosaic' ? 'present' : status;
    return {
      stdout:
        `pane_path\u0000/fixture/runtime-bin:/usr/bin:/bin\u0000status\u0000${effectiveStatus}\u0000` +
        `binary_path\u0000${effectiveStatus === 'present' ? `/fixture/runtime-bin/${binary ?? 'unknown'}` : ''}\u0000` +
        `dependency\u0000${effectiveStatus === 'present' ? 'node' : ''}\u0000` +
        `probe_command\u0000${effectiveStatus === 'present' ? 'node --version' : ''}\u0000` +
        `probe_exit\u0000${effectiveStatus === 'present' ? '0' : ''}\u0000probe_output\u0000\u0000`,
      stderr: '',
      exitCode: effectiveStatus === 'present' ? 0 : 69,
    };
  };
 }
 function capture(): string[] {
  const lines: string[] = [];
  vi.spyOn(console, 'log').mockImplementation((value: string): void => {
@@ -152,13 +177,64 @@ describe('mosaic fleet reconciler commands', (): void => {
    expect(lines.map((line: string): unknown => JSON.parse(line))).toMatchObject([
      { applied: false, lifecycle: 'not-applied' },
-      { applied: false, lifecycle: 'not-applied' },
+      {
        applied: false,
        lifecycle: 'not-applied',
        checks: {
          fleetCliExecutable: [
            {
              check: 'fleet-cli-executable',
              status: 'ok',
              requestedBy: ['coder0'],
              dependency: 'node',
              probeCommand: 'node --version',
            },
          ],
          fleetRuntimeAvailability: [
            {
              check: 'fleet-runtime-available',
              runtime: 'pi',
              status: 'ok',
              requestedBy: ['coder0'],
            },
          ],
        },
      },
    ]);
    expect(
      calls.every((call: string[]): boolean => call[0] !== 'systemctl' || call[2] === 'show'),
    ).toBe(true);
  });
  it('reports a missing roster runtime as a named non-green doctor check', async (): Promise<void> => {
    const home = await fleetHome();
    const lines = capture();
    await program(home, ownedRunner([]), {}, runtimeProbe('missing')).parseAsync([
      'node',
      'mosaic',
      'fleet',
      'doctor',
    ]);
    expect(JSON.parse(lines.pop() ?? '')).toMatchObject({
      applied: false,
      checks: {
        fleetRuntimeAvailability: [
          {
            check: 'fleet-runtime-available',
            runtime: 'pi',
            status: 'missing',
            requestedBy: ['coder0'],
            panePath: '/fixture/runtime-bin:/usr/bin:/bin',
            installCommand: 'npm install -g @earendil-works/pi-coding-agent',
          },
        ],
      },
    });
    expect(process.exitCode).toBe(1);
  });
  it.each(['start', 'stop', 'restart'] as const)(
    'uses exact roster-owned systemd targeting for %s',
    async (operation: 'start' | 'stop' | 'restart'): Promise<void> => {
@@ -8,10 +8,18 @@ import {
  type FleetReconcileCommand,
  type FleetReconcileDeps,
 } from '../fleet/fleet-reconciler.js';
 import {
  inspectFleetRuntimeAvailability,
  type FleetRuntimeInspection,
  type FleetRuntimePreflightCheck,
  type FleetRuntimeProbeRunner,
 } from '../fleet/fleet-runtime-preflight.js';
 import { parseRosterV2 } from '../fleet/roster-v2.js';
 export interface FleetReconcilerCommandDeps {
  readonly runner: CommandRunner;
  readonly runtimeProbeRunner?: FleetRuntimeProbeRunner;
  readonly frameworkRoot?: string;
  readonly mosaicHome?: string;
  readonly reconcileDeps?: Omit<FleetReconcileDeps, 'runner' | 'mosaicHome'>;
 }
@@ -71,6 +79,10 @@ export async function executeReconcilerCommand(
  const mosaicHome = resolveMosaicHome(fleetCommand, deps);
  const rosterPath = resolveRosterPath(fleetCommand, mosaicHome);
  const roster = parseRosterV2(await readFile(rosterPath, 'utf8'), 'yaml');
  const runtimeInspection =
    operation === 'doctor'
      ? await inspectRuntimeAvailability(roster.agents, mosaicHome, deps)
      : undefined;
  const mutating = operation === 'apply' || operation === 'reconcile' || isLifecycle(operation);
  const expectedGeneration = mutating
    ? parseExpectedGeneration(opts.expectedGeneration)
@@ -90,8 +102,31 @@ export async function executeReconcilerCommand(
      ...(deps.reconcileDeps ?? {}),
    },
  });
-  printJson(result);
+  printJson(operation === 'doctor' ? { ...result, checks: runtimeInspection } : result);
-  process.exitCode = result.recovery === undefined && result.cleanup === undefined ? 0 : 1;
+  const executableFailure =
    runtimeInspection !== undefined &&
    [...runtimeInspection.fleetCliExecutable, ...runtimeInspection.fleetRuntimeAvailability].some(
      (check: FleetRuntimePreflightCheck): boolean => check.status !== 'ok',
    );
  process.exitCode =
    result.recovery === undefined && result.cleanup === undefined && !executableFailure ? 0 : 1;
 }
 async function inspectRuntimeAvailability(
  agents: readonly { readonly name: string; readonly runtime: string }[],
  mosaicHome: string,
  deps: FleetReconcilerCommandDeps,
 ): Promise<FleetRuntimeInspection> {
  if (deps.frameworkRoot === undefined || deps.runtimeProbeRunner === undefined) {
    throw new Error('Fleet doctor runtime preflight dependencies are unavailable.');
  }
  return inspectFleetRuntimeAvailability({
    mosaicHome,
    agentEnvDir: join(mosaicHome, 'fleet', 'agents'),
    helperPath: join(deps.frameworkRoot, 'tools', 'fleet', 'pane-runtime-path.sh'),
    agents,
    runner: deps.runtimeProbeRunner,
  });
 }
 function isLifecycle(operation: FleetReconcileCommand): boolean {
@@ -4,6 +4,7 @@ import { tmpdir } from 'node:os';
 import { join, resolve } from 'node:path';
 import { Command } from 'commander';
 import { afterEach, describe, expect, it, vi } from 'vitest';
 import type { FleetRuntimeProbeRunner } from '../fleet/fleet-runtime-preflight.js';
 import { registerFleetCommand, type CommandResult, type CommandRunner } from './fleet.js';
 /**
@@ -69,6 +70,7 @@ agents:
 let tempHome: string | undefined;
 const savedHome = process.env.HOME;
 const savedMosaicHome = process.env.MOSAIC_HOME;
 const savedPath = process.env.PATH;
 afterEach(async (): Promise<void> => {
  vi.restoreAllMocks();
@@ -77,6 +79,8 @@ afterEach(async (): Promise<void> => {
  else process.env.HOME = savedHome;
  if (savedMosaicHome === undefined) delete process.env.MOSAIC_HOME;
  else process.env.MOSAIC_HOME = savedMosaicHome;
  if (savedPath === undefined) delete process.env.PATH;
  else process.env.PATH = savedPath;
  if (tempHome) await rm(tempHome, { recursive: true, force: true });
  tempHome = undefined;
 });
@@ -85,7 +89,7 @@ afterEach(async (): Promise<void> => {
 * A HOME with a roster-v2 fleet and nothing else — the greenfield shape, before
 * anything has been installed, applied or started.
 */
-async function v2Home(): Promise<string> {
+async function v2Home(options: { withPaneRuntime?: boolean } = {}): Promise<string> {
  tempHome = await mkdtemp(join(tmpdir(), 'mosaic-fleet-v2-dispatch-'));
  process.env.HOME = tempHome;
  delete process.env.MOSAIC_HOME;
@@ -97,6 +101,12 @@ async function v2Home(): Promise<string> {
  await writeFile(join(mosaicHome, 'fleet', 'roles', 'code.md'), '`class: code`\n\n# code\n', {
    mode: 0o600,
  });
  const runtimeDir = join(tempHome, '.npm-global', 'bin');
  await mkdir(runtimeDir, { recursive: true });
  await writeFile(join(runtimeDir, 'mosaic'), '#!/bin/sh\nexit 0\n', { mode: 0o755 });
  if (options.withPaneRuntime !== false) {
    await writeFile(join(runtimeDir, 'pi'), '#!/bin/sh\nexit 0\n', { mode: 0o755 });
  }
  return mosaicHome;
 }
@@ -113,10 +123,17 @@ const greenfieldRunner: CommandRunner = async (command): Promise<CommandResult>
  return { stdout: '', stderr: '', exitCode: 1 };
 };
-function program(runner: CommandRunner = greenfieldRunner): Command {
+function program(
  runner: CommandRunner = greenfieldRunner,
  runtimeProbeRunner?: FleetRuntimeProbeRunner,
 ): Command {
  const result = new Command();
  result.exitOverride();
-  registerFleetCommand(result, { runner, frameworkRoot: resolve(process.cwd(), 'framework') });
+  registerFleetCommand(result, {
    runner,
    frameworkRoot: resolve(process.cwd(), 'framework'),
    ...(runtimeProbeRunner === undefined ? {} : { runtimeProbeRunner }),
  });
  return result;
 }
@@ -166,6 +183,93 @@ describe('mosaic fleet ps — roster v2', (): void => {
 });
 describe('mosaic fleet install — roster v2', (): void => {
  it('rejects a roster runtime missing from the pane PATH before installing any files', async (): Promise<void> => {
    const mosaicHome = await v2Home({ withPaneRuntime: false });
    const operatorBin = join(tempHome!, 'operator-bin');
    await mkdir(operatorBin, { recursive: true });
    await writeFile(join(operatorBin, 'pi'), '#!/bin/sh\nexit 0\n', { mode: 0o755 });
    process.env.PATH = `${operatorBin}:${savedPath ?? '/usr/bin:/bin'}`;
    let message = '';
    try {
      await program().parseAsync([
        'node',
        'mosaic',
        'fleet',
        '--mosaic-home',
        mosaicHome,
        'install',
        '--no-enable',
      ]);
    } catch (error: unknown) {
      message = error instanceof Error ? error.message : String(error);
    }
    expect(message).toContain('runtime=pi');
    expect(message).toContain('requested_by=coder0,coder1');
    expect(message).toContain('pane_path=');
    expect(message).toContain('npm install -g @earendil-works/pi-coding-agent');
    expect(message).not.toContain(operatorBin);
    expect(
      await exists(join(tempHome!, '.config', 'systemd', 'user', '[email protected]')),
    ).toBe(false);
    expect(await exists(join(mosaicHome, 'fleet', 'holder.id'))).toBe(false);
    expect(await exists(join(mosaicHome, 'tools'))).toBe(false);
  });
  it('rejects resolved Node-shebang commands when Node is absent from the pane PATH', async (): Promise<void> => {
    const mosaicHome = await v2Home();
    const runtimeDir = join(tempHome!, '.npm-global', 'bin');
    const nodeScript = '#!/usr/bin/env node\nconsole.log("should-not-run");\n';
    await writeFile(join(runtimeDir, 'mosaic'), nodeScript, { mode: 0o755 });
    await writeFile(join(runtimeDir, 'pi'), nodeScript, { mode: 0o755 });
    await writeFile(join(tempHome!, '.npmrc'), `prefix=${join(tempHome!, 'absent-prefix')}\n`);
    const isolatedSystemPath = join(tempHome!, 'system-bin');
    await mkdir(isolatedSystemPath, { recursive: true });
    const isolatedProbeRunner: FleetRuntimeProbeRunner = async (
      command,
      args,
    ): Promise<CommandResult> =>
      new Promise((settle) => {
        const child = execFile(
          command,
          [...args, '--system-path', isolatedSystemPath],
          { encoding: 'utf8' },
          (error, stdout, stderr) => {
            settle({
              stdout,
              stderr,
              exitCode: child.exitCode ?? (error === null ? 0 : 1),
            });
          },
        );
      });
    let message = '';
    try {
      await program(greenfieldRunner, isolatedProbeRunner).parseAsync([
        'node',
        'mosaic',
        'fleet',
        '--mosaic-home',
        mosaicHome,
        'install',
        '--no-enable',
      ]);
    } catch (error: unknown) {
      message = error instanceof Error ? error.message : String(error);
    }
    expect(message).toContain('check=fleet-cli-executable');
    expect(message).toContain('binary=mosaic');
    expect(message).toContain('dependency=node');
    expect(message).toContain('check=fleet-runtime-available');
    expect(message).toContain('runtime=pi');
    expect(message).not.toContain('/usr/bin');
    expect(await exists(join(mosaicHome, 'fleet', 'holder.id'))).toBe(false);
    expect(await exists(join(mosaicHome, 'tools'))).toBe(false);
  });
  it('places the tool files and unit templates', async (): Promise<void> => {
    const mosaicHome = await v2Home();
    capture();
@@ -183,9 +287,11 @@ describe('mosaic fleet install — roster v2', (): void => {
    ]) {
      expect(await exists(join(systemdUserDir, unit))).toBe(true);
    }
-    const launcher = join(mosaicHome, 'tools', 'fleet', 'start-agent-session.sh');
+    for (const tool of ['start-agent-session.sh', 'pane-runtime-path.sh']) {
-    expect(await exists(launcher)).toBe(true);
+      const toolPath = join(mosaicHome, 'tools', 'fleet', tool);
-    expect((await stat(launcher)).mode & 0o777).toBe(0o755);
+      expect(await exists(toolPath)).toBe(true);
      expect((await stat(toolPath)).mode & 0o777).toBe(0o755);
    }
  });
  it('writes NO generated env — that file belongs to the reconciler (#791)', async (): Promise<void> => {
@@ -1277,6 +1277,10 @@ describe('fleet command construction', () => {
    const home = await tempDir();
    process.env.HOME = home;
    delete process.env.MOSAIC_HOME;
    const runtimeDir = join(home, '.npm-global', 'bin');
    await mkdir(runtimeDir, { recursive: true });
    await writeFile(join(runtimeDir, 'pi'), '#!/bin/sh\nexit 0\n', { mode: 0o755 });
    await writeFile(join(runtimeDir, 'mosaic'), '#!/bin/sh\nexit 0\n', { mode: 0o755 });
    const mosaicHome = join(home, '.config', 'mosaic');
    const program = new Command();
    program.exitOverride();
@@ -1315,6 +1319,10 @@ describe('fleet command construction', () => {
    const originalHome = process.env.HOME;
    const home = await tempDir();
    process.env.HOME = home;
    const runtimeDir = join(home, '.npm-global', 'bin');
    await mkdir(runtimeDir, { recursive: true });
    await writeFile(join(runtimeDir, 'pi'), '#!/bin/sh\nexit 0\n', { mode: 0o755 });
    await writeFile(join(runtimeDir, 'mosaic'), '#!/bin/sh\nexit 0\n', { mode: 0o755 });
    const mosaicHome = join(home, '.config', 'mosaic');
    const agentEnvDir = join(mosaicHome, 'fleet', 'agents');
    const fleetDir = join(mosaicHome, 'fleet');
@@ -60,6 +60,12 @@ import {
  writeAgentEnvironmentProjection,
  writeManagedFleetRoster,
 } from '../fleet/generated-env-boundary.js';
 import {
  assertFleetRuntimeAvailability,
  FleetRuntimePreflightError,
  inspectFleetRuntimeAvailability,
  type FleetRuntimeProbeRunner,
 } from '../fleet/fleet-runtime-preflight.js';
 import { registerFleetBacklogCommand } from './fleet-backlog.js';
 import { registerFleetPersonaCommand } from './fleet-personas.js';
 import { registerFleetProfileCommand } from './fleet-profiles.js';
@@ -89,6 +95,8 @@ export type SleepFn = (ms: number) => Promise<void>;
 export interface FleetCommandDeps {
  runner?: CommandRunner;
  /** Executes the pane-PATH helper under a clean launcher environment. */
  runtimeProbeRunner?: FleetRuntimeProbeRunner;
  /** Injectable interactive runner for commands needing inherited TTY (e.g., `tmux attach`). */
  interactiveRunner?: InteractiveRunner;
  /**
@@ -1429,6 +1437,10 @@ export function isSendAccepted(capturedOutput: string): SendVerifyResult {
 export function registerFleetCommand(program: Command, deps: FleetCommandDeps = {}): Command {
  const runner = deps.runner ?? runCommand;
  const runtimeProbeRunner: FleetRuntimeProbeRunner =
    deps.runtimeProbeRunner ??
    (async (command: string, args: readonly string[]): Promise<CommandResult> =>
      runCommand(command, [...args]));
  const sleepFn = deps.sleepFn ?? defaultSleep;
  const paths = resolveFleetPaths(deps.mosaicHome);
  const frameworkRoot = deps.frameworkRoot ?? resolveFrameworkRoot();
@@ -1527,7 +1539,7 @@ export function registerFleetCommand(program: Command, deps: FleetCommandDeps =
    .description('Install local fleet tools and user systemd units')
    .option('--no-enable', 'Skip enabling units for boot-survival')
    .action(async (opts: { enable?: boolean }) => {
-      await installFleet(cmd, frameworkRoot);
+      await installFleet(cmd, frameworkRoot, runtimeProbeRunner);
      // Unit enablement needs agent names only, so it reads either version.
      const roster = await loadRosterReadModel(cmd);
      await enableFleetUnits(runner, roster, opts);
@@ -1538,7 +1550,7 @@ export function registerFleetCommand(program: Command, deps: FleetCommandDeps =
    .description('Install local fleet tools and user systemd units')
    .option('--no-enable', 'Skip enabling units for boot-survival')
    .action(async (opts: { enable?: boolean }) => {
-      await installFleet(cmd, frameworkRoot);
+      await installFleet(cmd, frameworkRoot, runtimeProbeRunner);
      // Unit enablement needs agent names only, so it reads either version.
      const roster = await loadRosterReadModel(cmd);
      await enableFleetUnits(runner, roster, opts);
@@ -2084,6 +2096,8 @@ export function registerFleetCommand(program: Command, deps: FleetCommandDeps =
  });
  registerFleetReconcilerCommands(cmd, {
    runner,
    runtimeProbeRunner,
    frameworkRoot,
    mosaicHome: deps.mosaicHome,
    reconcileDeps: deps.reconcileDeps,
  });
@@ -2349,18 +2363,68 @@ export function registerFleetAgentCommands(
    });
 }
-async function installFleet(cmd: Command, frameworkRoot: string): Promise<void> {
+async function installFleet(
  cmd: Command,
  frameworkRoot: string,
  runtimeProbeRunner: FleetRuntimeProbeRunner,
 ): Promise<void> {
  const activePaths = resolveFleetPaths(cmd.opts<{ mosaicHome: string }>().mosaicHome);
  assertDefaultMosaicHomeForSystemd(activePaths.mosaicHome);
-  // Read model first: every file this function places is roster-independent, and
+  // Read and preflight before the first mkdir/copy/chmod/write. A successful
-  // the v1 parser would reject a v2 roster before any of them were written.
+  // install must mean every roster runtime is executable in the eventual pane,
  // not merely visible to the operator who invoked this command.
  const roster = await loadRosterReadModel(cmd);
  const v1Roster = roster.version === 1 ? await loadRosterForCommand(cmd) : undefined;
  const preflightV1Projections =
    v1Roster === undefined
      ? []
      : await Promise.all(
          v1Roster.agents.map((agent: FleetAgent) =>
            prepareAgentEnvironmentProjection({
              mosaicHome: activePaths.mosaicHome,
              agentEnvDir: activePaths.agentEnvDir,
              agentName: agent.name,
              generated: generateAgentEnvValues(v1Roster, agent),
            }),
          ),
        );
  const preflightAgents =
    v1Roster === undefined
      ? roster.agents
      : v1Roster.agents.map((agent: FleetAgent, index: number) => {
          const prepared = preflightV1Projections[index];
          if (prepared === undefined) {
            throw new Error(`Missing prepared environment projection for ${agent.name}.`);
          }
          const local = parseAgentEnvironment(prepared.local, 'local');
          return {
            name: agent.name,
            runtime: agent.runtime,
            runtimeBin: local['MOSAIC_RUNTIME_BIN'] ?? '',
          };
        });
  const runtimeInspection = await inspectFleetRuntimeAvailability({
    mosaicHome: activePaths.mosaicHome,
    agentEnvDir: activePaths.agentEnvDir,
    helperPath: join(frameworkRoot, 'tools', 'fleet', 'pane-runtime-path.sh'),
    agents: preflightAgents,
    runner: runtimeProbeRunner,
  });
  try {
    assertFleetRuntimeAvailability(runtimeInspection);
  } catch (error: unknown) {
    if (error instanceof FleetRuntimePreflightError) {
      cmd.error(error.message, { code: 'fleet.runtime-preflight', exitCode: 1 });
    }
    throw error;
  }
  await ensureFleetHolderIdentity(activePaths.mosaicHome);
  await mkdir(activePaths.fleetToolsDir, { recursive: true });
  await mkdir(activePaths.tmuxToolsDir, { recursive: true });
  await mkdir(activePaths.systemdUserDir, { recursive: true });
  const startAgentSessionPath = join(activePaths.fleetToolsDir, 'start-agent-session.sh');
  const paneRuntimePath = join(activePaths.fleetToolsDir, 'pane-runtime-path.sh');
  const startInteractionServicePath = join(
    activePaths.fleetToolsDir,
    'start-interaction-service.sh',
@@ -2374,6 +2438,7 @@ async function installFleet(cmd: Command, frameworkRoot: string): Promise<void>
  const agentSendPath = join(activePaths.tmuxToolsDir, 'agent-send.sh');
  const executableToolPaths = [
    startAgentSessionPath,
    paneRuntimePath,
    startInteractionServicePath,
    startTmuxHolderPath,
    printInteractionPolicyPath,
@@ -2384,6 +2449,7 @@ async function installFleet(cmd: Command, frameworkRoot: string): Promise<void>
    join(frameworkRoot, 'tools', 'fleet', 'start-agent-session.sh'),
    startAgentSessionPath,
  );
  await copyFile(join(frameworkRoot, 'tools', 'fleet', 'pane-runtime-path.sh'), paneRuntimePath);
  await copyFile(
    join(frameworkRoot, 'tools', 'fleet', 'start-interaction-service.sh'),
    startInteractionServicePath,
@@ -2427,7 +2493,9 @@ async function installFleet(cmd: Command, frameworkRoot: string): Promise<void>
    return;
  }
-  const v1Roster = await loadRosterForCommand(cmd);
+  if (v1Roster === undefined) {
    throw new Error('Roster version changed while installing fleet files.');
  }
  for (const agent of v1Roster.agents) {
    await writeAgentEnvironmentProjection({
      mosaicHome: activePaths.mosaicHome,
@@ -0,0 +1,328 @@
 import { spawn } from 'node:child_process';
 import { chmod, mkdir, mkdtemp, rm, writeFile } from 'node:fs/promises';
 import { tmpdir } from 'node:os';
 import { join, resolve } from 'node:path';
 import { afterEach, describe, expect, it } from 'vitest';
 import {
  inspectFleetRuntimeAvailability,
  type FleetRuntimeProbeResult,
  type FleetRuntimeProbeRunner,
 } from './fleet-runtime-preflight.js';
 const helperPath = resolve(process.cwd(), 'framework', 'tools', 'fleet', 'pane-runtime-path.sh');
 let cleanup: string | undefined;
 afterEach(async (): Promise<void> => {
  if (cleanup !== undefined) await rm(cleanup, { recursive: true, force: true });
  cleanup = undefined;
 });
 interface FleetFixture {
  readonly root: string;
  readonly mosaicHome: string;
  readonly agentEnvDir: string;
  readonly runtimeDir: string;
 }
 async function fleetHome(): Promise<FleetFixture> {
  const root = await mkdtemp(join(tmpdir(), 'mosaic-fleet-runtime-preflight-'));
  cleanup = root;
  const mosaicHome = join(root, '.config', 'mosaic');
  const agentEnvDir = join(mosaicHome, 'fleet', 'agents');
  const runtimeDir = join(root, '.npm-global', 'bin');
  await mkdir(agentEnvDir, { recursive: true, mode: 0o700 });
  await mkdir(runtimeDir, { recursive: true });
  for (const directory of [mosaicHome, join(mosaicHome, 'fleet'), agentEnvDir]) {
    await chmod(directory, 0o700);
  }
  await writeExecutable(runtimeDir, 'mosaic', '#!/bin/sh\nexit 0\n');
  return { root, mosaicHome, agentEnvDir, runtimeDir };
 }
 async function writeExecutable(directory: string, name: string, content: string): Promise<void> {
  await mkdir(directory, { recursive: true });
  await writeFile(join(directory, name), content, { mode: 0o755 });
 }
 const processRunner: FleetRuntimeProbeRunner = async (
  command: string,
  args: readonly string[],
 ): Promise<FleetRuntimeProbeResult> =>
  new Promise((settle) => {
    const child = spawn(command, [...args], { stdio: ['ignore', 'pipe', 'pipe'] });
    let stdout = '';
    let stderr = '';
    child.stdout.setEncoding('utf8');
    child.stderr.setEncoding('utf8');
    child.stdout.on('data', (chunk: string): void => {
      stdout += chunk;
    });
    child.stderr.on('data', (chunk: string): void => {
      stderr += chunk;
    });
    child.on('error', (error: Error): void => {
      settle({ stdout, stderr: `${stderr}${error.message}`, exitCode: 127 });
    });
    child.on('close', (code: number | null): void => {
      settle({ stdout, stderr, exitCode: code ?? 1 });
    });
  });
 describe('fleet runtime preflight', (): void => {
  it('executes one distinct pane runtime and aggregates every requesting roster row', async (): Promise<void> => {
    const fixture = await fleetHome();
    await writeExecutable(fixture.runtimeDir, 'pi', '#!/bin/sh\nexit 0\n');
    let probes = 0;
    const inspection = await inspectFleetRuntimeAvailability({
      mosaicHome: fixture.mosaicHome,
      agentEnvDir: fixture.agentEnvDir,
      helperPath,
      agents: [
        { name: 'coder1', runtime: 'pi' },
        { name: 'coder0', runtime: 'pi' },
      ],
      runner: async (command, args): Promise<FleetRuntimeProbeResult> => {
        probes += 1;
        return processRunner(command, args);
      },
    });
    expect(probes).toBe(2);
    expect(inspection.fleetCliExecutable).toEqual([
      expect.objectContaining({
        check: 'fleet-cli-executable',
        status: 'ok',
        requestedBy: ['coder0', 'coder1'],
        binaryPath: join(fixture.runtimeDir, 'mosaic'),
        dependency: '/bin/sh',
      }),
    ]);
    expect(inspection.fleetRuntimeAvailability).toEqual([
      expect.objectContaining({
        check: 'fleet-runtime-available',
        runtime: 'pi',
        status: 'ok',
        requestedBy: ['coder0', 'coder1'],
        binaryPath: join(fixture.runtimeDir, 'pi'),
        dependency: '/bin/sh',
        installCommand: 'npm install -g @earendil-works/pi-coding-agent',
      }),
    ]);
    expect(inspection.fleetRuntimeAvailability[0]?.panePath).toContain(fixture.runtimeDir);
  });
  it('returns an actionable non-green check when the pane PATH lacks the runtime', async (): Promise<void> => {
    const fixture = await fleetHome();
    const inspection = await inspectFleetRuntimeAvailability({
      mosaicHome: fixture.mosaicHome,
      agentEnvDir: fixture.agentEnvDir,
      helperPath,
      agents: [{ name: 'coder0', runtime: 'pi' }],
      runner: processRunner,
    });
    expect(inspection.fleetCliExecutable[0]?.status).toBe('ok');
    expect(inspection.fleetRuntimeAvailability).toEqual([
      expect.objectContaining({
        check: 'fleet-runtime-available',
        runtime: 'pi',
        status: 'missing',
        requestedBy: ['coder0'],
        installCommand: 'npm install -g @earendil-works/pi-coding-agent',
      }),
    ]);
    expect(inspection.fleetRuntimeAvailability[0]?.panePath).not.toContain(
      process.env['PATH'] ?? 'operator-path-absent',
    );
  });
  it('executes the side-effect-free Node version probe for Node-shebang commands', async (): Promise<void> => {
    const fixture = await fleetHome();
    const nodeScript = '#!/usr/bin/env node\nconsole.log("should-not-run");\n';
    await writeExecutable(fixture.runtimeDir, 'mosaic', nodeScript);
    await writeExecutable(fixture.runtimeDir, 'pi', nodeScript);
    await writeExecutable(
      fixture.runtimeDir,
      'node',
      '#!/bin/sh\n[ "$1" = --version ] || exit 9\nprintf "v-fixture-node\\n"\n',
    );
    const inspection = await inspectFleetRuntimeAvailability({
      mosaicHome: fixture.mosaicHome,
      agentEnvDir: fixture.agentEnvDir,
      helperPath,
      agents: [{ name: 'coder0', runtime: 'pi' }],
      runner: processRunner,
    });
    for (const check of [
      ...inspection.fleetCliExecutable,
      ...inspection.fleetRuntimeAvailability,
    ]) {
      expect(check).toMatchObject({
        status: 'ok',
        dependency: 'node',
        probeCommand: 'node --version',
        probeExit: 0,
        probeOutput: 'v-fixture-node',
      });
    }
  });
  it('reddens when resolved Node-shebang commands cannot execute without pane Node', async (): Promise<void> => {
    const fixture = await fleetHome();
    const isolatedSystemPath = join(fixture.root, 'system-bin');
    await mkdir(isolatedSystemPath, { recursive: true });
    await writeFile(
      join(fixture.root, '.npmrc'),
      `prefix=${join(fixture.root, 'absent-prefix')}\n`,
    );
    const nodeScript = '#!/usr/bin/env node\nconsole.log("should-not-run");\n';
    await writeExecutable(fixture.runtimeDir, 'mosaic', nodeScript);
    await writeExecutable(fixture.runtimeDir, 'pi', nodeScript);
    const inspection = await inspectFleetRuntimeAvailability({
      mosaicHome: fixture.mosaicHome,
      agentEnvDir: fixture.agentEnvDir,
      helperPath,
      agents: [{ name: 'coder0', runtime: 'pi' }],
      runner: processRunner,
      systemPath: isolatedSystemPath,
    });
    expect(inspection.fleetCliExecutable).toEqual([
      expect.objectContaining({
        check: 'fleet-cli-executable',
        status: 'unexecutable',
        binaryPath: join(fixture.runtimeDir, 'mosaic'),
        dependency: 'node',
        probeCommand: 'node --version',
      }),
    ]);
    expect(inspection.fleetRuntimeAvailability).toEqual([
      expect.objectContaining({
        check: 'fleet-runtime-available',
        runtime: 'pi',
        status: 'unexecutable',
        binaryPath: join(fixture.runtimeDir, 'pi'),
        dependency: 'node',
        probeCommand: 'node --version',
      }),
    ]);
    expect(inspection.fleetCliExecutable[0]?.probeOutput).toBe(
      'shebang command is not on the pane PATH',
    );
    expect(inspection.fleetCliExecutable[0]?.panePath).not.toContain('/usr/bin');
  });
  it('keeps distinct effective local runtime-bin paths as distinct checks', async (): Promise<void> => {
    const fixture = await fleetHome();
    const firstBin = join(fixture.root, 'first-bin');
    const secondBin = join(fixture.root, 'second-bin');
    for (const override of [
      { agent: 'coder0', runtimeBin: firstBin },
      { agent: 'coder1', runtimeBin: secondBin },
    ]) {
      await writeExecutable(override.runtimeBin, 'pi', '#!/bin/sh\nexit 0\n');
      await writeFile(
        join(fixture.agentEnvDir, `${override.agent}.env.local`),
        `MOSAIC_RUNTIME_BIN=${override.runtimeBin}\n`,
        { mode: 0o600 },
      );
    }
    const inspection = await inspectFleetRuntimeAvailability({
      mosaicHome: fixture.mosaicHome,
      agentEnvDir: fixture.agentEnvDir,
      helperPath,
      agents: [
        { name: 'coder0', runtime: 'pi' },
        { name: 'coder1', runtime: 'pi' },
      ],
      runner: processRunner,
    });
    expect(inspection.fleetCliExecutable).toHaveLength(2);
    expect(inspection.fleetRuntimeAvailability).toHaveLength(2);
    expect(inspection.fleetRuntimeAvailability.map((check) => check.requestedBy)).toEqual([
      ['coder0'],
      ['coder1'],
    ]);
    expect(inspection.fleetRuntimeAvailability.map((check) => check.binaryPath)).toEqual([
      join(firstBin, 'pi'),
      join(secondBin, 'pi'),
    ]);
  });
  it('reports each distinct roster runtime with its exact install command', async (): Promise<void> => {
    const fixture = await fleetHome();
    let probes = 0;
    const inspection = await inspectFleetRuntimeAvailability({
      mosaicHome: fixture.mosaicHome,
      agentEnvDir: fixture.agentEnvDir,
      helperPath,
      agents: [
        { name: 'pi-seat', runtime: 'pi' },
        { name: 'claude-seat', runtime: 'claude' },
        { name: 'codex-seat', runtime: 'codex' },
        { name: 'opencode-seat', runtime: 'opencode' },
      ],
      runner: async (): Promise<FleetRuntimeProbeResult> => {
        probes += 1;
        return {
          stdout:
            'pane_path\u0000/fixture/bin:/usr/bin:/bin\u0000status\u0000missing\u0000' +
            'binary_path\u0000\u0000probe_exit\u0000\u0000probe_output\u0000\u0000',
          stderr: '',
          exitCode: 69,
        };
      },
    });
    expect(probes).toBe(5);
    expect(
      inspection.fleetRuntimeAvailability.map((check) => ({
        runtime: check.runtime,
        installCommand: check.installCommand,
      })),
    ).toEqual([
      {
        runtime: 'claude',
        installCommand: 'curl -fsSL https://claude.ai/install.sh | bash',
      },
      {
        runtime: 'codex',
        installCommand: 'npm install -g @openai/codex',
      },
      {
        runtime: 'opencode',
        installCommand: 'npm install -g opencode-ai',
      },
      {
        runtime: 'pi',
        installCommand: 'npm install -g @earendil-works/pi-coding-agent',
      },
    ]);
  });
  it('fails closed when the shared helper returns malformed evidence', async (): Promise<void> => {
    const fixture = await fleetHome();
    await expect(
      inspectFleetRuntimeAvailability({
        mosaicHome: fixture.mosaicHome,
        agentEnvDir: fixture.agentEnvDir,
        helperPath,
        agents: [{ name: 'coder0', runtime: 'pi' }],
        runner: async (): Promise<FleetRuntimeProbeResult> => ({
          stdout: 'not-a-field-protocol',
          stderr: '',
          exitCode: 0,
        }),
      }),
    ).rejects.toThrow('malformed field output');
  });
 });
@@ -0,0 +1,362 @@
 import { homedir } from 'node:os';
 import { getInstallInstructions } from '../runtime/detector.js';
 import type { RuntimeName } from '../types.js';
 import { compareCodePoints } from './deterministic-order.js';
 import {
  GENERATED_AGENT_ENV_SUPPORTED_RUNTIMES,
  readAgentLocalEnvironment,
 } from './generated-env-boundary.js';
 const RUNTIME_SET = new Set<string>(GENERATED_AGENT_ENV_SUPPORTED_RUNTIMES);
 export interface FleetRuntimeRequestedAgent {
  readonly name: string;
  readonly runtime: string;
  /** Planned effective local override, when provisioning has already prepared it. */
  readonly runtimeBin?: string;
 }
 export interface FleetRuntimeProbeResult {
  readonly stdout: string;
  readonly stderr: string;
  readonly exitCode: number;
 }
 export type FleetRuntimeProbeRunner = (
  command: string,
  args: readonly string[],
 ) => Promise<FleetRuntimeProbeResult>;
 export interface FleetRuntimePreflightOptions {
  readonly mosaicHome: string;
  readonly agentEnvDir: string;
  readonly helperPath: string;
  readonly agents: readonly FleetRuntimeRequestedAgent[];
  readonly runner: FleetRuntimeProbeRunner;
  /** Test-only system suffix; production and the launcher use the helper default. */
  readonly systemPath?: string;
 }
 export type FleetExecutableStatus = 'ok' | 'missing' | 'unexecutable';
 interface FleetExecutableEvidence {
  readonly status: FleetExecutableStatus;
  readonly panePath: string;
  readonly binaryPath?: string;
  readonly dependency?: string;
  readonly probeCommand?: string;
  readonly probeExit?: number;
  readonly probeOutput?: string;
 }
 export interface FleetCliExecutableCheck extends FleetExecutableEvidence {
  readonly check: 'fleet-cli-executable';
  readonly binary: 'mosaic';
  readonly requestedBy: readonly string[];
 }
 export interface FleetRuntimeCheck extends FleetExecutableEvidence {
  readonly check: 'fleet-runtime-available';
  readonly runtime: RuntimeName;
  readonly requestedBy: readonly string[];
  readonly installCommand: string;
 }
 export type FleetRuntimePreflightCheck = FleetCliExecutableCheck | FleetRuntimeCheck;
 export interface FleetRuntimeInspection {
  readonly fleetCliExecutable: readonly FleetCliExecutableCheck[];
  readonly fleetRuntimeAvailability: readonly FleetRuntimeCheck[];
 }
 interface EffectiveAgent {
  readonly name: string;
  readonly runtime: RuntimeName;
  readonly runtimeBin: string;
 }
 interface PaneProbeGroup {
  readonly runtimeBin: string;
  readonly requestedBy: string[];
 }
 interface RuntimeProbeGroup extends PaneProbeGroup {
  readonly runtime: RuntimeName;
 }
 interface BinaryProbeRequest {
  readonly binary: string;
  readonly runtimeBin: string;
 }
 export class FleetRuntimePreflightError extends Error {
  readonly checks: readonly FleetRuntimePreflightCheck[];
  constructor(checks: readonly FleetRuntimePreflightCheck[]) {
    super(formatFleetRuntimePreflightError(checks));
    this.name = FleetRuntimePreflightError.name;
    this.checks = checks;
  }
 }
 export class FleetRuntimeProbeError extends Error {
  constructor(message: string) {
    super(message);
    this.name = FleetRuntimeProbeError.name;
  }
 }
 /**
 * Proves the fleet CLI and every distinct runtime/effective-bin pair resolve
 * with an executable shebang interpreter through the eventual pane PATH. The
 * helper runs under the unit's clean launcher environment, so operator PATH can
 * neither create a false green nor provide a hidden interpreter.
 */
 export async function inspectFleetRuntimeAvailability(
  options: FleetRuntimePreflightOptions,
 ): Promise<FleetRuntimeInspection> {
  const agents = await resolveEffectiveAgents(options);
  const paneGroups = groupPaneRequests(agents);
  const runtimeGroups = groupRuntimeRequests(agents);
  const fleetCliExecutable: FleetCliExecutableCheck[] = [];
  for (const group of paneGroups) {
    const evidence = await probeBinary(options, {
      binary: 'mosaic',
      runtimeBin: group.runtimeBin,
    });
    fleetCliExecutable.push({
      check: 'fleet-cli-executable',
      binary: 'mosaic',
      requestedBy: sortedRequestedBy(group.requestedBy),
      ...evidence,
    });
  }
  const fleetRuntimeAvailability: FleetRuntimeCheck[] = [];
  for (const group of runtimeGroups) {
    const evidence = await probeBinary(options, {
      binary: group.runtime,
      runtimeBin: group.runtimeBin,
    });
    fleetRuntimeAvailability.push({
      check: 'fleet-runtime-available',
      runtime: group.runtime,
      requestedBy: sortedRequestedBy(group.requestedBy),
      installCommand: getInstallInstructions(group.runtime),
      ...evidence,
    });
  }
  return Object.freeze({
    fleetCliExecutable: Object.freeze(fleetCliExecutable),
    fleetRuntimeAvailability: Object.freeze(fleetRuntimeAvailability),
  });
 }
 export function assertFleetRuntimeAvailability(inspection: FleetRuntimeInspection): void {
  const checks: FleetRuntimePreflightCheck[] = [
    ...inspection.fleetCliExecutable,
    ...inspection.fleetRuntimeAvailability,
  ];
  const failures = checks.filter(
    (check: FleetRuntimePreflightCheck): boolean => check.status !== 'ok',
  );
  if (failures.length > 0) throw new FleetRuntimePreflightError(failures);
 }
 export function formatFleetRuntimePreflightError(
  checks: readonly FleetRuntimePreflightCheck[],
 ): string {
  const lines = ['Fleet runtime preflight failed:'];
  for (const check of checks) {
    const dependency = check.dependency === undefined ? '' : ` dependency=${check.dependency}`;
    const probe = check.probeCommand === undefined ? '' : ` dependency_probe=${check.probeCommand}`;
    const execution =
      check.status === 'unexecutable'
        ? ` probe_exit=${check.probeExit?.toString() ?? 'not-run'} ` +
          `probe_output=${JSON.stringify(check.probeOutput ?? '')}`
        : '';
    if (check.check === 'fleet-cli-executable') {
      lines.push(
        `check=${check.check} binary=${check.binary} ` +
          `requested_by=${check.requestedBy.join(',')} pane_path=${check.panePath}` +
          `${dependency}${probe}${execution} ` +
          'action=repair the Mosaic installation until its pane dependencies resolve',
      );
      continue;
    }
    lines.push(
      `check=${check.check} runtime=${check.runtime} ` +
        `requested_by=${check.requestedBy.join(',')} pane_path=${check.panePath}` +
        `${dependency}${probe}${execution} install_command=${check.installCommand}`,
    );
  }
  return lines.join('\n');
 }
 async function resolveEffectiveAgents(
  options: FleetRuntimePreflightOptions,
 ): Promise<readonly EffectiveAgent[]> {
  const agents: EffectiveAgent[] = [];
  for (const agent of options.agents) {
    if (!isRuntimeName(agent.runtime)) {
      throw new FleetRuntimeProbeError(`Unsupported fleet runtime: ${agent.runtime}`);
    }
    const runtimeBin =
      agent.runtimeBin ??
      (
        await readAgentLocalEnvironment({
          mosaicHome: options.mosaicHome,
          agentEnvDir: options.agentEnvDir,
          agentName: agent.name,
        })
      )['MOSAIC_RUNTIME_BIN'] ??
      '';
    agents.push({ name: agent.name, runtime: agent.runtime, runtimeBin });
  }
  return agents;
 }
 function groupPaneRequests(agents: readonly EffectiveAgent[]): readonly PaneProbeGroup[] {
  const groups = new Map<string, PaneProbeGroup>();
  for (const agent of agents) {
    const current = groups.get(agent.runtimeBin);
    if (current === undefined) {
      groups.set(agent.runtimeBin, { runtimeBin: agent.runtimeBin, requestedBy: [agent.name] });
    } else {
      current.requestedBy.push(agent.name);
    }
  }
  return [...groups.values()].sort((left, right): number =>
    compareCodePoints(left.runtimeBin, right.runtimeBin),
  );
 }
 function groupRuntimeRequests(agents: readonly EffectiveAgent[]): readonly RuntimeProbeGroup[] {
  const groups = new Map<string, RuntimeProbeGroup>();
  for (const agent of agents) {
    const key = JSON.stringify([agent.runtime, agent.runtimeBin]);
    const current = groups.get(key);
    if (current === undefined) {
      groups.set(key, {
        runtime: agent.runtime,
        runtimeBin: agent.runtimeBin,
        requestedBy: [agent.name],
      });
    } else {
      current.requestedBy.push(agent.name);
    }
  }
  return [...groups.values()].sort((left, right): number =>
    compareCodePoints(
      `${left.runtime}\u0000${left.runtimeBin}`,
      `${right.runtime}\u0000${right.runtimeBin}`,
    ),
  );
 }
 async function probeBinary(
  options: FleetRuntimePreflightOptions,
  probe: BinaryProbeRequest,
 ): Promise<FleetExecutableEvidence> {
  const args = [
    '-i',
    `HOME=${process.env['HOME'] ?? homedir()}`,
    'PATH=/usr/bin:/bin',
    `MOSAIC_HOME=${options.mosaicHome}`,
    '/bin/bash',
    '--noprofile',
    '--norc',
    options.helperPath,
    '--mosaic-home',
    options.mosaicHome,
    '--binary',
    probe.binary,
    '--check-executable',
  ];
  if (probe.runtimeBin !== '') args.push('--runtime-bin', probe.runtimeBin);
  if (options.systemPath !== undefined) args.push('--system-path', options.systemPath);
  const result = await options.runner('/usr/bin/env', args);
  const fields = parseNulFields(result.stdout);
  const panePath = requiredField(fields, 'pane_path');
  const status = requiredField(fields, 'status');
  if (result.exitCode === 0 && status === 'present') {
    return executableEvidence('ok', panePath, fields);
  }
  if (result.exitCode === 69 && status === 'missing') {
    return { status: 'missing', panePath };
  }
  if (result.exitCode === 70 && status === 'unexecutable') {
    return executableEvidence('unexecutable', panePath, fields);
  }
  throw new FleetRuntimeProbeError(
    `Fleet executable probe failed: binary=${probe.binary} exit=${result.exitCode.toString()} ` +
      `stderr=${JSON.stringify(result.stderr.trim())}`,
  );
 }
 function executableEvidence(
  status: 'ok' | 'unexecutable',
  panePath: string,
  fields: ReadonlyMap<string, string>,
 ): FleetExecutableEvidence {
  const dependency = requiredField(fields, 'dependency');
  const probeCommand = requiredField(fields, 'probe_command');
  const probeExit = requiredField(fields, 'probe_exit');
  const probeOutput = requiredField(fields, 'probe_output');
  return {
    status,
    panePath,
    binaryPath: requiredField(fields, 'binary_path'),
    ...(dependency === '' ? {} : { dependency }),
    ...(probeCommand === '' ? {} : { probeCommand }),
    ...(probeExit === '' ? {} : { probeExit: parseProbeExit(probeExit) }),
    ...(probeOutput === '' ? {} : { probeOutput }),
  };
 }
 function sortedRequestedBy(requestedBy: readonly string[]): readonly string[] {
  return Object.freeze(
    [...requestedBy].sort((left: string, right: string): number => compareCodePoints(left, right)),
  );
 }
 function parseNulFields(source: string): ReadonlyMap<string, string> {
  const parts = source.split('\u0000');
  if (parts.at(-1) === '') parts.pop();
  if (parts.length % 2 !== 0) {
    throw new FleetRuntimeProbeError('Fleet runtime probe returned malformed field output.');
  }
  const fields = new Map<string, string>();
  for (let index = 0; index < parts.length; index += 2) {
    const key = parts[index];
    const value = parts[index + 1];
    if (key === undefined || value === undefined || key === '' || fields.has(key)) {
      throw new FleetRuntimeProbeError('Fleet runtime probe returned malformed field output.');
    }
    fields.set(key, value);
  }
  return fields;
 }
 function requiredField(fields: ReadonlyMap<string, string>, key: string): string {
  const value = fields.get(key);
  if (value === undefined) {
    throw new FleetRuntimeProbeError(`Fleet runtime probe omitted ${key}.`);
  }
  return value;
 }
 function parseProbeExit(value: string): number {
  const exitCode = Number(value);
  if (!Number.isSafeInteger(exitCode) || exitCode < 0) {
    throw new FleetRuntimeProbeError('Fleet runtime probe returned an invalid execution status.');
  }
  return exitCode;
 }
 function isRuntimeName(value: string): value is RuntimeName {
  return RUNTIME_SET.has(value);
 }
@@ -25,6 +25,12 @@ export interface AgentGeneratedProjectionDeletionOptions {
  readonly agentName: string;
 }
 export interface AgentLocalEnvironmentReadOptions {
  readonly mosaicHome: string;
  readonly agentEnvDir: string;
  readonly agentName: string;
 }
 export interface AgentEnvironmentProjectionResult {
  readonly generatedPath: string;
  readonly localPath: string;
@@ -145,6 +151,23 @@ export function parseAgentEnvironment(
  return Object.freeze(values);
 }
 /**
 * Reads one agent's optional local overrides through the same path, file-type,
 * permission, key, and value boundary used by projection/launch handling.
 */
 export async function readAgentLocalEnvironment(
  options: AgentLocalEnvironmentReadOptions,
 ): Promise<Readonly<Record<string, string>>> {
  if (!AGENT_NAME.test(options.agentName)) {
    throw new AgentEnvBoundaryError('unsafe-agent-name', 'MOSAIC_AGENT_NAME', options.agentName);
  }
  await validatePrivateProjectionDirectory(options.mosaicHome, options.agentEnvDir);
  const source = await readOptionalPrivateFile(
    join(options.agentEnvDir, `${options.agentName}.env.local`),
  );
  return source === undefined ? Object.freeze({}) : parseAgentEnvironment(source, 'local');
 }
 /** Renders the roster-derived generated projection in a stable, complete key order. */
 export function renderGeneratedAgentEnvironment(values: Readonly<Record<string, string>>): string {
  const normalized = normalizeGeneratedValues(values);
@@ -19,7 +19,7 @@ const RUNTIME_DEFS: Record<
    label: 'Claude Code',
    command: 'claude',
    versionFlag: '--version',
-    installHint: 'npm install -g @anthropic-ai/claude-code',
+    installHint: 'curl -fsSL https://claude.ai/install.sh | bash',
  },
  codex: {
    label: 'Codex',
@@ -31,13 +31,13 @@ const RUNTIME_DEFS: Record<
    label: 'OpenCode',
    command: 'opencode',
    versionFlag: 'version',
-    installHint: 'See https://opencode.ai for install instructions',
+    installHint: 'npm install -g opencode-ai',
  },
  pi: {
    label: 'Pi',
    command: 'pi',
    versionFlag: '--version',
-    installHint: 'curl -fsSL https://pi.dev/install.sh | sh',
+    installHint: 'npm install -g @earendil-works/pi-coding-agent',
  },
 };