fix(fleet): propagate roster git identity (#1073)

Co-authored-by: be-coder-06 <[email protected]>

packages/mosaic/framework/systemd/user/test-fleet-units.sh

@@ -112,6 +112,7 @@ EOF
   chmod 700 "$AGENT_HOME/fleet/agents"
   cat > "$AGENT_HOME/fleet/agents/$AGENT_NAME.env.generated" <<EOF
 MOSAIC_AGENT_NAME=$AGENT_NAME
+MOSAIC_GIT_IDENTITY=$AGENT_NAME
 MOSAIC_AGENT_CLASS=code
 MOSAIC_AGENT_RUNTIME=pi
 MOSAIC_AGENT_MODEL=

packages/mosaic/framework/tools/fleet/start-agent-session.sh

@@ -97,7 +97,7 @@ is_sensitive_key() {
 
 is_generated_key() {
   case "$1" in
-    MOSAIC_AGENT_NAME|MOSAIC_AGENT_CLASS|MOSAIC_AGENT_RUNTIME|MOSAIC_AGENT_MODEL|MOSAIC_AGENT_REASONING|MOSAIC_AGENT_TOOL_POLICY|MOSAIC_AGENT_WORKDIR|MOSAIC_TMUX_SOCKET) return 0 ;;
+    MOSAIC_AGENT_NAME|MOSAIC_GIT_IDENTITY|MOSAIC_AGENT_CLASS|MOSAIC_AGENT_RUNTIME|MOSAIC_AGENT_MODEL|MOSAIC_AGENT_REASONING|MOSAIC_AGENT_TOOL_POLICY|MOSAIC_AGENT_WORKDIR|MOSAIC_TMUX_SOCKET) return 0 ;;
     *) return 1 ;;
   esac
 }
@@ -114,6 +114,7 @@ validate_generated_value() {
   local value="$2"
   case "$key" in
     MOSAIC_AGENT_NAME) safe_agent_name "$value" || fail_env unsafe-agent-name "$key" "$value" ;;
+    MOSAIC_GIT_IDENTITY) safe_agent_name "$value" || fail_env unsafe-git-identity "$key" "$value" ;;
     MOSAIC_AGENT_CLASS) safe_policy_name "$value" || fail_env unsafe-class "$key" "$value" ;;
     MOSAIC_AGENT_RUNTIME)
       case "$value" in claude|codex|opencode|pi) ;; *) fail_env unsupported-runtime "$key" "$value" ;; esac
@@ -175,7 +176,7 @@ load_environment_file() {
 
 load_environment_file "$GENERATED_ENV" generated
 for required_key in \
-  MOSAIC_AGENT_NAME MOSAIC_AGENT_CLASS MOSAIC_AGENT_RUNTIME MOSAIC_AGENT_MODEL \
+  MOSAIC_AGENT_NAME MOSAIC_GIT_IDENTITY MOSAIC_AGENT_CLASS MOSAIC_AGENT_RUNTIME MOSAIC_AGENT_MODEL \
   MOSAIC_AGENT_REASONING MOSAIC_AGENT_TOOL_POLICY MOSAIC_AGENT_WORKDIR MOSAIC_TMUX_SOCKET; do
   [ -n "${GENERATED_VALUES[$required_key]+set}" ] || fail_env missing-key "$required_key" ''
 done
@@ -183,12 +184,15 @@ load_environment_file "$LOCAL_ENV" local
 
 [ "${GENERATED_VALUES[MOSAIC_AGENT_NAME]}" = "$AGENT_NAME" ] || \
   fail_env agent-name-mismatch MOSAIC_AGENT_NAME "${GENERATED_VALUES[MOSAIC_AGENT_NAME]}"
+[ "${GENERATED_VALUES[MOSAIC_GIT_IDENTITY]}" = "$AGENT_NAME" ] || \
+  fail_env git-identity-mismatch MOSAIC_GIT_IDENTITY "${GENERATED_VALUES[MOSAIC_GIT_IDENTITY]}"
 
 MOSAIC_TMUX_SOCKET=${GENERATED_VALUES[MOSAIC_TMUX_SOCKET]}
 MOSAIC_AGENT_RUNTIME=${GENERATED_VALUES[MOSAIC_AGENT_RUNTIME]}
 MOSAIC_AGENT_MODEL=${GENERATED_VALUES[MOSAIC_AGENT_MODEL]}
 MOSAIC_AGENT_REASONING=${GENERATED_VALUES[MOSAIC_AGENT_REASONING]}
 MOSAIC_AGENT_WORKDIR=${GENERATED_VALUES[MOSAIC_AGENT_WORKDIR]}
+MOSAIC_GIT_IDENTITY=${GENERATED_VALUES[MOSAIC_GIT_IDENTITY]}
 MOSAIC_AGENT_CLASS=${GENERATED_VALUES[MOSAIC_AGENT_CLASS]}
 MOSAIC_AGENT_TOOL_POLICY=${GENERATED_VALUES[MOSAIC_AGENT_TOOL_POLICY]}
 MOSAIC_RUNTIME_BIN=${LOCAL_VALUES[MOSAIC_RUNTIME_BIN]:-}
@@ -343,6 +347,7 @@ LAUNCH_ENV=(
   "PATH=$PANE_PATH"
   "MOSAIC_HOME=$MOSAIC_HOME"
   "MOSAIC_AGENT_NAME=$AGENT_NAME"
+  "MOSAIC_GIT_IDENTITY=$MOSAIC_GIT_IDENTITY"
   "MOSAIC_AGENT_CLASS=$MOSAIC_AGENT_CLASS"
   "MOSAIC_AGENT_RUNTIME=$MOSAIC_AGENT_RUNTIME"
   "MOSAIC_AGENT_MODEL=$MOSAIC_AGENT_MODEL"

packages/mosaic/framework/tools/fleet/test-start-agent-session.sh

@@ -62,6 +62,19 @@ env -0 > "${MOSAIC_HOME:?}/fleet/pane-environment"
 SHIM
 chmod +x "$FAKE_BIN/mosaic"
 
+# Freeze numeric epoch reads only when a test arm supplies an observation bound.
+# Formatting reads still use the real BusyBox/POSIX date implementation.
+cat > "$FAKE_BIN/date" <<'SHIM'
+#!/usr/bin/env bash
+set -euo pipefail
+if [ -n "${MOSAIC_TEST_FIXED_EPOCH:-}" ] && [ "${1:-}" = '+%s' ]; then
+  printf '%s\n' "$MOSAIC_TEST_FIXED_EPOCH"
+  exit 0
+fi
+exec /bin/date "$@"
+SHIM
+chmod +x "$FAKE_BIN/date"
+
 write_generated() {
   local home="$1"
   local agent="$2"
@@ -71,6 +84,7 @@ write_generated() {
   chmod 600 "$home/fleet/run/holder-owner"
   cat > "$home/fleet/agents/$agent.env.generated" <<EOF
 MOSAIC_AGENT_NAME=$agent
+MOSAIC_GIT_IDENTITY=$agent
 MOSAIC_AGENT_CLASS=code
 MOSAIC_AGENT_RUNTIME=pi
 MOSAIC_AGENT_MODEL=openai-codex/gpt-5.6-sol
@@ -88,6 +102,7 @@ run_start() {
   local agent="$2"
   HOME="$home" PATH="$FAKE_BIN:$PATH" MOSAIC_TEST_TMUX_CALLS="$TMUX_CALLS" \
     MOSAIC_TEST_PANE_PID="${MOSAIC_TEST_PANE_PID:-}" \
+    MOSAIC_TEST_FIXED_EPOCH="${MOSAIC_TEST_FIXED_EPOCH:-}" \
     MOSAIC_TEST_HOME="$home" \
     MOSAIC_TEST_FLEET_OWNER=123e4567-e89b-12d3-a456-426614174000 \
     MOSAIC_HOME="$home" "$START" "$agent"
@@ -114,6 +129,42 @@ fi
 echo "$valid_args" | grep -qxF '/usr/bin/env' || fail "pane does not use absolute env"
 echo "$valid_args" | grep -qxF -- '-i' || fail "pane environment is not cleared"
 
+# Git identity is generated authority, not an optional or independently mutable
+# local value. Each invalid form must fail before fake tmux receives a call.
+assert_git_identity_rejected() {
+  local case_name="$1"
+  local expected_code="$2"
+  local home="$ROOT/git-identity-$case_name"
+  local agent="coder-git-identity-$case_name"
+  local generated="$home/fleet/agents/$agent.env.generated"
+  write_generated "$home" "$agent"
+
+  case "$case_name" in
+    missing) grep -v '^MOSAIC_GIT_IDENTITY=' "$generated" > "$generated.next" && mv "$generated.next" "$generated" ;;
+    unsafe) sed -i 's|^MOSAIC_GIT_IDENTITY=.*$|MOSAIC_GIT_IDENTITY=bad/identity|' "$generated" ;;
+    mismatch) sed -i 's|^MOSAIC_GIT_IDENTITY=.*$|MOSAIC_GIT_IDENTITY=other-agent|' "$generated" ;;
+    local-shadow)
+      printf 'MOSAIC_GIT_IDENTITY=%s\n' "$agent" > "$home/fleet/agents/$agent.env.local"
+      chmod 600 "$home/fleet/agents/$agent.env.local"
+      ;;
+    *) fail "unknown Git identity rejection case: $case_name" ;;
+  esac
+  chmod 600 "$generated"
+
+  : > "$TMUX_CALLS"
+  if output=$(run_start "$home" "$agent" 2>&1); then
+    fail "Git identity case $case_name was accepted"
+  fi
+  [ ! -s "$TMUX_CALLS" ] || fail "tmux ran before Git identity $case_name rejection"
+  echo "$output" | grep -qF "code=$expected_code" || \
+    fail "Git identity $case_name diagnostic omitted code $expected_code"
+}
+
+assert_git_identity_rejected missing missing-key
+assert_git_identity_rejected unsafe unsafe-git-identity
+assert_git_identity_rejected mismatch git-identity-mismatch
+assert_git_identity_rejected local-shadow generated-key-shadow
+
 # The generated-file parent is a security boundary too: even a private regular
 # file is untrusted if its parent can be replaced or written by another user.
 # Validation must happen before fake tmux receives even a has-session call.
@@ -274,6 +325,18 @@ after_pane_env=$(printf '%s\n' "$pane_args" | grep -n -m1 -F '/usr/bin/env' | cu
 printf '%s\n' "$pane_args" | tail -n +"$after_pane_env" | grep -qxF -- '-i' || \
   fail "pane command did not clear its environment"
 pane_environment=$(tr '\0' '\n' < "$HOME_PANE_BOUNDARY/fleet/pane-environment")
+# Exercise the repository launcher at $START, not the independently installed
+# host copy. Set-compare every declared generated projection entry with the
+# launched process environment so a newly declared identity cannot be omitted
+# by a hand-maintained per-variable assertion.
+declared_generated_environment=$(sort "$HOME_PANE_BOUNDARY/fleet/agents/coder-pane-boundary.env.generated")
+missing_or_changed_generated_environment=$(comm -23 \
+  <(printf '%s\n' "$declared_generated_environment") \
+  <(printf '%s\n' "$pane_environment" | sort))
+if [ -n "$missing_or_changed_generated_environment" ]; then
+  missing_or_changed_keys=$(printf '%s\n' "$missing_or_changed_generated_environment" | cut -d= -f1 | paste -sd, -)
+  fail "runtime pane omitted or changed generated environment keys: $missing_or_changed_keys"
+fi
 echo "$pane_environment" | grep -qxF "HOME=$PANE_TRUSTED_HOME" || \
   fail "runtime pane did not receive trusted HOME"
 echo "$pane_environment" | grep -qF "$PANE_STALE_PATH" && fail "runtime pane received stale PATH"
@@ -290,6 +353,7 @@ write_interaction_generated() {
   chmod 600 "$home/fleet/run/holder-owner"
   cat > "$home/fleet/agents/$agent.env.generated" <<EOF
 MOSAIC_AGENT_NAME=$agent
+MOSAIC_GIT_IDENTITY=$agent
 MOSAIC_AGENT_CLASS=operator-interaction
 MOSAIC_AGENT_RUNTIME=pi
 MOSAIC_AGENT_MODEL=openai/gpt-5.6-sol
@@ -352,8 +416,12 @@ write_generated "$HOME_NATIVE_STALE" "coder-native-stale"
 write_heartbeat_local "$HOME_NATIVE_STALE" "coder-native-stale"
 STALE_HB="$HOME_NATIVE_STALE/run/coder-native-stale.hb"
 printf 'ts=native\npid=1\nstatus=busy\nmodel=stale-model\n' > "$STALE_HB"
-touch -d '10 seconds ago' "$STALE_HB.native"
-MOSAIC_TEST_PANE_PID=$$ run_start "$HOME_NATIVE_STALE" coder-native-stale
+touch -t 200001010000.00 "$STALE_HB.native"
+# Hold the sidecar's observation epoch constant: assertion runtime must not age
+# a fresh-marker mutant into the stale state that this fixture must distinguish.
+STALE_OBSERVATION_EPOCH=$(date +%s)
+MOSAIC_TEST_FIXED_EPOCH="$STALE_OBSERVATION_EPOCH" \
+  MOSAIC_TEST_PANE_PID=$$ run_start "$HOME_NATIVE_STALE" coder-native-stale
 wait_for_sidecar_status "$STALE_HB"
 
 HOME_NATIVE_ABSENT="$ROOT/native-absent"
@@ -381,7 +449,7 @@ echo "$output" | grep -qF 'code=unknown-key' || fail "interaction did not use sh
 : > "$TMUX_CALLS"
 HOME_INTERACTION_POLICY="$ROOT/interaction-policy"
 write_interaction_generated "$HOME_INTERACTION_POLICY" "interaction-policy"
-perl -0pi -e 's/MOSAIC_AGENT_RUNTIME=pi/MOSAIC_AGENT_RUNTIME=codex/' \
+sed -i 's|^MOSAIC_AGENT_RUNTIME=pi$|MOSAIC_AGENT_RUNTIME=codex|' \
   "$HOME_INTERACTION_POLICY/fleet/agents/interaction-policy.env.generated"
 if output=$(run_interaction "$HOME_INTERACTION_POLICY" interaction-policy 2>&1); then
   fail "interaction wrapper accepted a policy-incompatible projection"

packages/mosaic/framework/tools/quality/test-enumeration-exclusions.txt

@@ -32,7 +32,6 @@ packages/mosaic/framework/tools/tmux/test-send-message-socket.sh | requires a re
 packages/mosaic/framework/tools/tmux/test-send-message-verdict.sh | requires real tmux-pane fixtures on a throwaway socket; CI image ships no tmux; #1017 burndown (same condition as its sibling)
 
 # --- single-suite directories: unmeasured in CI ---
-packages/mosaic/framework/tools/fleet/test-start-agent-session.sh | unmeasured in CI image; stubs tmux via a fake bin dir, likely CI-fit; #1017 burndown
 packages/mosaic/framework/tools/glpi/test-list-http-status.sh | unmeasured in CI image; stub-based (#807 regression harness), likely CI-fit; #1017 burndown
 packages/mosaic/framework/tools/orchestrator/test-board-roll.sh | unmeasured in CI image; file-fixture based, likely CI-fit; #1017 burndown
 packages/mosaic/framework/tools/woodpecker/test-ci-wait-exit-matrix.sh | unmeasured in CI image; drives ci-wait.sh against a stub pipeline-status.sh, likely CI-fit; #1017 burndown

packages/mosaic/package.json

@@ -25,7 +25,7 @@
     "lint": "eslint src",
     "typecheck": "tsc --noEmit",
     "test": "vitest run --passWithNoTests && pnpm run test:framework-shell",
-    "test:framework-shell": "bash framework/tools/quality/scripts/check-test-enumeration.sh && bash framework/tools/quality/scripts/test-check-test-enumeration.sh && python3 src/lease-broker/daemon_deadline_unittest.py && python3 src/lease-broker/normative_fragments_unittest.py && python3 src/lease-broker/receipt_challenge_unittest.py && python3 src/lease-broker/context_recovery_unittest.py && python3 src/lease-broker/recovery_runtime_unittest.py && python3 src/lease-broker/recovery_b1_adversarial_unittest.py && python3 src/lease-broker/framework_skill_portability_unittest.py && python3 src/mutator-gate/runtime_tools_unittest.py && python3 src/mutator-gate/runtime_launch_guard_unittest.py && python3 src/mutator-gate/version_coupling_unittest.py && python3 framework/tools/lease-broker/check-runtime-launches.py --root ../.. && bash framework/tools/codex/test-pr-diff-context.sh && bash framework/tools/qa/test-deps-preflight.sh && bash framework/tools/git/test-pr-review-gitea-comment.sh && bash framework/tools/git/test-pr-review-repo-host-override.sh && bash framework/tools/git/test-ci-queue-wait-branch-absent.sh && bash framework/tools/git/test-ci-queue-wait-tristate.sh && bash framework/tools/git/test-ci-queue-wait-github-checks.sh && bash framework/tools/git/test-pr-merge-queue-branch.sh && bash framework/tools/git/test-pr-merge-head-pin.sh && bash framework/tools/git/test-pr-merge-message-field.sh && bash framework/tools/git/test-git-credential-mosaic.sh && bash framework/tools/git/test-gitea-token-identity.sh && bash framework/tools/git/test-explain-diagnostic-status-neutral.sh && bash framework/tools/git/test-detect-platform-outside-repo.sh && bash framework/tools/woodpecker/test-terminal-green-contract.sh && bash framework/tools/_scripts/test-install-ordering-guard.sh && bash framework/tools/tmux/agent-send.test.sh && bash framework/tools/wake/test-wake-store-ack.sh && bash framework/tools/wake/test-wake-store-enqueue-race.sh && bash framework/tools/wake/test-wake-digest-hmac.sh && bash framework/tools/wake/test-wake-digest-quarantine.sh && bash framework/tools/wake/test-wake-detector.sh && bash framework/tools/wake/test-wake-fn-oracle.sh && bash framework/tools/wake/test-wake-reconcile.sh && bash framework/tools/wake/test-wake-beacon.sh && bash framework/tools/wake/test-wake-preimage.sh && bash framework/tools/wake/test-wake-install.sh"
+    "test:framework-shell": "bash framework/tools/quality/scripts/check-test-enumeration.sh && bash framework/tools/quality/scripts/test-check-test-enumeration.sh && bash framework/tools/fleet/test-start-agent-session.sh && bash framework/systemd/user/test-fleet-units.sh && python3 src/lease-broker/daemon_deadline_unittest.py && python3 src/lease-broker/normative_fragments_unittest.py && python3 src/lease-broker/receipt_challenge_unittest.py && python3 src/lease-broker/context_recovery_unittest.py && python3 src/lease-broker/recovery_runtime_unittest.py && python3 src/lease-broker/recovery_b1_adversarial_unittest.py && python3 src/lease-broker/framework_skill_portability_unittest.py && python3 src/mutator-gate/runtime_tools_unittest.py && python3 src/mutator-gate/runtime_launch_guard_unittest.py && python3 src/mutator-gate/version_coupling_unittest.py && python3 framework/tools/lease-broker/check-runtime-launches.py --root ../.. && bash framework/tools/codex/test-pr-diff-context.sh && bash framework/tools/qa/test-deps-preflight.sh && bash framework/tools/git/test-pr-review-gitea-comment.sh && bash framework/tools/git/test-pr-review-repo-host-override.sh && bash framework/tools/git/test-ci-queue-wait-branch-absent.sh && bash framework/tools/git/test-ci-queue-wait-tristate.sh && bash framework/tools/git/test-ci-queue-wait-github-checks.sh && bash framework/tools/git/test-pr-merge-queue-branch.sh && bash framework/tools/git/test-pr-merge-head-pin.sh && bash framework/tools/git/test-pr-merge-message-field.sh && bash framework/tools/git/test-git-credential-mosaic.sh && bash framework/tools/git/test-gitea-token-identity.sh && bash framework/tools/git/test-explain-diagnostic-status-neutral.sh && bash framework/tools/git/test-detect-platform-outside-repo.sh && bash framework/tools/woodpecker/test-terminal-green-contract.sh && bash framework/tools/_scripts/test-install-ordering-guard.sh && bash framework/tools/tmux/agent-send.test.sh && bash framework/tools/wake/test-wake-store-ack.sh && bash framework/tools/wake/test-wake-store-enqueue-race.sh && bash framework/tools/wake/test-wake-digest-hmac.sh && bash framework/tools/wake/test-wake-digest-quarantine.sh && bash framework/tools/wake/test-wake-detector.sh && bash framework/tools/wake/test-wake-fn-oracle.sh && bash framework/tools/wake/test-wake-reconcile.sh && bash framework/tools/wake/test-wake-beacon.sh && bash framework/tools/wake/test-wake-preimage.sh && bash framework/tools/wake/test-wake-install.sh"
   },
   "dependencies": {
     "@mosaicstack/brain": "workspace:*",

packages/mosaic/src/commands/fleet-regen-command.spec.ts

@@ -131,13 +131,14 @@ async function exists(path: string): Promise<boolean> {
 }
 
 describe('projectRosterV2AgentGeneratedEnv', (): void => {
-  it('maps a roster-v2 agent to exactly the eight generated projection keys', (): void => {
+  it('maps a roster-v2 agent to exactly the nine generated projection keys', (): void => {
     const roster = parseRosterV2(rosterYaml, 'yaml');
     const agent = roster.agents.find((candidate) => candidate.name === 'coder0');
     expect(agent).toBeDefined();
     const values = projectRosterV2AgentGeneratedEnv(roster, agent!);
     expect(values).toEqual({
       MOSAIC_AGENT_NAME: 'coder0',
+      MOSAIC_GIT_IDENTITY: 'coder0',
       MOSAIC_AGENT_CLASS: 'code',
       MOSAIC_AGENT_RUNTIME: 'pi',
       MOSAIC_AGENT_MODEL: 'gpt-5.6-sol',

packages/mosaic/src/commands/fleet.spec.ts

@@ -422,6 +422,7 @@ describe('fleet roster parsing', () => {
     expect(generateAgentEnv(roster, getRosterAgent(roster, 'coder0'))).toBe(
       [
         'MOSAIC_AGENT_NAME=coder0',
+        'MOSAIC_GIT_IDENTITY=coder0',
         // Reflects the roster's canonicalized compatibility class (A3a).
         'MOSAIC_AGENT_CLASS=code',
         'MOSAIC_AGENT_RUNTIME=codex',
@@ -3799,6 +3800,7 @@ describe('fleet add command', () => {
       'utf8',
     );
     expect(envContent).toContain('MOSAIC_AGENT_NAME=coder0');
+    expect(envContent).toContain('MOSAIC_GIT_IDENTITY=coder0');
     expect(envContent).toContain('MOSAIC_AGENT_RUNTIME=codex');
   });
 

packages/mosaic/src/commands/fleet.ts

@@ -484,6 +484,7 @@ function generateAgentEnvValues(
   const workingDirectory = agent.workingDirectory ?? roster.defaults.workingDirectory;
   return {
     MOSAIC_AGENT_NAME: agent.name,
+    MOSAIC_GIT_IDENTITY: agent.name,
     MOSAIC_AGENT_CLASS: agent.className,
     MOSAIC_AGENT_RUNTIME: agent.runtime,
     MOSAIC_AGENT_MODEL: agent.modelHint ?? '',

packages/mosaic/src/fleet/fleet-agent-crud.ts

@@ -358,6 +358,7 @@ function generatedValues(
 ): Readonly<Record<string, string>> {
   return {
     MOSAIC_AGENT_NAME: agent.name,
+    MOSAIC_GIT_IDENTITY: agent.name,
     MOSAIC_AGENT_CLASS: agent.className,
     MOSAIC_AGENT_RUNTIME: agent.runtime,
     MOSAIC_AGENT_MODEL: agent.model,

packages/mosaic/src/fleet/fleet-documentation.spec.ts

@@ -380,7 +380,7 @@ const COMMAND_RECORDS: Readonly<Record<string, RegExp>> = {
 
 const DATA_PROFILE_BODIES: Readonly<Record<string, string>> = {
   'DATA.DOTENV.FLEET_LAUNCH':
-    'MOSAIC_AGENT_NAME=<roster name>\nMOSAIC_AGENT_CLASS=<roster class>\nMOSAIC_AGENT_RUNTIME=<roster runtime>\nMOSAIC_AGENT_MODEL=<roster model hint>\nMOSAIC_AGENT_REASONING=<roster reasoning>\nMOSAIC_AGENT_TOOL_POLICY=<roster tool policy>\nMOSAIC_AGENT_WORKDIR=<absolute roster work directory>\nMOSAIC_TMUX_SOCKET=<roster socket or empty>',
+    'MOSAIC_AGENT_NAME=<roster name>\nMOSAIC_GIT_IDENTITY=<roster name>\nMOSAIC_AGENT_CLASS=<roster class>\nMOSAIC_AGENT_RUNTIME=<roster runtime>\nMOSAIC_AGENT_MODEL=<roster model hint>\nMOSAIC_AGENT_REASONING=<roster reasoning>\nMOSAIC_AGENT_TOOL_POLICY=<roster tool policy>\nMOSAIC_AGENT_WORKDIR=<absolute roster work directory>\nMOSAIC_TMUX_SOCKET=<roster socket or empty>',
   'DATA.TEXT_TABLE.FLEET_TASKS':
     '| W-FLEET | in-progress | Fleet (agent-session execution layer) | Phase 2/5 | docs/fleet/TASKS.md | observability dogfooded on live stub fleet; control plane rides federation (W1) |',
   'DATA.TEXT_DIAGRAM.BACKLOG_FLOW':
@@ -406,7 +406,7 @@ const DATA_PROFILE_BODIES: Readonly<Record<string, string>> = {
   'DATA.JSON.MUTATION_RESULT':
     '{\n  "applied": false,\n  "authoritativeRoster": "committed",\n  "projections": "incomplete",\n  "recovery": {\n    "code": "projection-apply-failed",\n    "action": "regenerate-projections-from-roster"\n  }\n}',
   'DATA.DOTENV.GENERATED_ENV':
-    'MOSAIC_AGENT_NAME=<roster name>\nMOSAIC_AGENT_CLASS=<roster class>\nMOSAIC_AGENT_RUNTIME=<roster runtime>\nMOSAIC_AGENT_MODEL=<roster model hint>\nMOSAIC_AGENT_REASONING=<roster reasoning>\nMOSAIC_AGENT_TOOL_POLICY=<roster tool policy>\nMOSAIC_AGENT_WORKDIR=<absolute roster work directory>\nMOSAIC_TMUX_SOCKET=<roster socket or empty>',
+    'MOSAIC_AGENT_NAME=<roster name>\nMOSAIC_GIT_IDENTITY=<roster name>\nMOSAIC_AGENT_CLASS=<roster class>\nMOSAIC_AGENT_RUNTIME=<roster runtime>\nMOSAIC_AGENT_MODEL=<roster model hint>\nMOSAIC_AGENT_REASONING=<roster reasoning>\nMOSAIC_AGENT_TOOL_POLICY=<roster tool policy>\nMOSAIC_AGENT_WORKDIR=<absolute roster work directory>\nMOSAIC_TMUX_SOCKET=<roster socket or empty>',
   'DATA.YAML.ROSTER_FIELDS':
     'version: 2\ngeneration: 1\ntransport: tmux\ntmux:\n  socket_name: mosaic-fleet\n  holder_session: _holder\ndefaults:\n  working_directory: ~/src\n  runtime: pi\nruntimes:\n  pi:\n    reset_command: /new\nagents:\n  - name: coder0\n    alias: Coder 0\n    class: code\n    runtime: pi\n    provider: openai\n    model: gpt-5.6-sol\n    reasoning: high\n    tool_policy: code\n    working_directory: ~/src\n    persistent_persona: false\n    reset_between_tasks: true\n    lifecycle:\n      enabled: true\n      desired_state: stopped\n    launch:\n      yolo: true',
 };
@@ -922,8 +922,8 @@ describe('fleet operator documentation', (): void => {
     );
     expect(
       surfaces.filter((surface): boolean => surface.category === 'InlineLiteral'),
-    ).toHaveLength(858);
-    expect(surfaces).toHaveLength(882);
+    ).toHaveLength(863);
+    expect(surfaces).toHaveLength(887);
 
     const rosterSource = await readFile(join(fleetDocs, 'examples', 'roster-v2.yaml'), 'utf8');
     const auxiliary: CodeSurface = {

packages/mosaic/src/fleet/fleet-reconciler.ts

@@ -597,6 +597,7 @@ export function projectRosterV2AgentGeneratedEnv(
 ): Readonly<Record<string, string>> {
   return {
     MOSAIC_AGENT_NAME: agent.name,
+    MOSAIC_GIT_IDENTITY: agent.name,
     MOSAIC_AGENT_CLASS: agent.className,
     MOSAIC_AGENT_RUNTIME: agent.runtime,
     MOSAIC_AGENT_MODEL: agent.model,

packages/mosaic/src/fleet/generated-env-boundary.spec.ts

@@ -22,6 +22,7 @@ import {
 
 const generatedValues = {
   MOSAIC_AGENT_NAME: 'coder0',
+  MOSAIC_GIT_IDENTITY: 'coder0',
   MOSAIC_AGENT_CLASS: 'code',
   MOSAIC_AGENT_RUNTIME: 'pi',
   MOSAIC_AGENT_MODEL: 'openai-codex/gpt-5.6-sol',
@@ -45,6 +46,7 @@ describe('generated fleet agent environment boundary', (): void => {
     expect(renderGeneratedAgentEnvironment(generatedValues)).toBe(
       [
         'MOSAIC_AGENT_NAME=coder0',
+        'MOSAIC_GIT_IDENTITY=coder0',
         'MOSAIC_AGENT_CLASS=code',
         'MOSAIC_AGENT_RUNTIME=pi',
         'MOSAIC_AGENT_MODEL=openai-codex/gpt-5.6-sol',
@@ -78,6 +80,22 @@ describe('generated fleet agent environment boundary', (): void => {
     expect(String(error)).toMatch(/key=.*sha256=/);
   });
 
+  it.each([
+    ['unsafe-git-identity', 'other/identity'],
+    ['git-identity-mismatch', 'reviewer0'],
+  ])('rejects %s before any launch consumer can use it', (code: string, identity: string): void => {
+    expect((): void => {
+      renderGeneratedAgentEnvironment({
+        ...generatedValues,
+        MOSAIC_GIT_IDENTITY: identity,
+      });
+    }).toThrow(
+      expect.objectContaining({
+        diagnostic: expect.objectContaining({ code, key: 'MOSAIC_GIT_IDENTITY' }),
+      }),
+    );
+  });
+
   it('rejects unsafe generated paths before any launch consumer can use them', (): void => {
     expect((): void => {
       renderGeneratedAgentEnvironment({

packages/mosaic/src/fleet/generated-env-boundary.ts

@@ -73,6 +73,7 @@ export class AgentEnvBoundaryError extends Error {
 
 export const GENERATED_AGENT_ENV_KEYS = [
   'MOSAIC_AGENT_NAME',
+  'MOSAIC_GIT_IDENTITY',
   'MOSAIC_AGENT_CLASS',
   'MOSAIC_AGENT_RUNTIME',
   'MOSAIC_AGENT_MODEL',
@@ -402,6 +403,7 @@ function assertGeneratedValues(values: Readonly<Record<string, string>>): void {
     if (value === undefined) throw new AgentEnvBoundaryError('missing-key', key, '');
   }
   const name = requiredGeneratedValue(values, 'MOSAIC_AGENT_NAME');
+  const gitIdentity = requiredGeneratedValue(values, 'MOSAIC_GIT_IDENTITY');
   const className = requiredGeneratedValue(values, 'MOSAIC_AGENT_CLASS');
   const runtime = requiredGeneratedValue(values, 'MOSAIC_AGENT_RUNTIME');
   const model = requiredGeneratedValue(values, 'MOSAIC_AGENT_MODEL');
@@ -412,6 +414,12 @@ function assertGeneratedValues(values: Readonly<Record<string, string>>): void {
 
   if (!AGENT_NAME.test(name))
     throw new AgentEnvBoundaryError('unsafe-agent-name', 'MOSAIC_AGENT_NAME', name);
+  if (!AGENT_NAME.test(gitIdentity)) {
+    throw new AgentEnvBoundaryError('unsafe-git-identity', 'MOSAIC_GIT_IDENTITY', gitIdentity);
+  }
+  if (gitIdentity !== name) {
+    throw new AgentEnvBoundaryError('git-identity-mismatch', 'MOSAIC_GIT_IDENTITY', gitIdentity);
+  }
   if (!POLICY_NAME.test(className)) {
     throw new AgentEnvBoundaryError('unsafe-class', 'MOSAIC_AGENT_CLASS', className);
   }

packages/mosaic/src/fleet/v1-v2-migration.ts

@@ -1405,6 +1405,7 @@ function generatedValues(
 ): Readonly<Record<string, string>> {
   return {
     MOSAIC_AGENT_NAME: agent.name,
+    MOSAIC_GIT_IDENTITY: agent.name,
     MOSAIC_AGENT_CLASS: agent.className,
     MOSAIC_AGENT_RUNTIME: agent.runtime,
     MOSAIC_AGENT_MODEL: agent.model,