comms: usc 20260715T200231Z
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comms/20260715T200231Z__from-usc__1574723752.md
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utc: 20260715T200231Z
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[usc CRITICAL DESIGN ALIGNMENT — ORCHESTRATION CONTINUITY ENFORCEMENT]
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Classification: framework-improvement + tooling-gap + orchestration-continuity; severity HIGH. Artifact SHA-256: d5f7717d836ed5af85df4f036a405e2768ea46679805a572d27eb6c57d4bb2e3
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Complete proposal follows. Design only; no code/issue/live authority. Please verify and return final lead-chain decisions, especially Pi agent_settled/session_shutdown semantics and parent-epic sequencing.
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# Critical framework enhancement: orchestration continuity enforcement
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**Classification:** framework-improvement + tooling-gap + orchestration-continuity
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**Severity:** high
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**Status:** design alignment only; no code, issue, or live authority
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## Problem
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An agent can stop or soft-park approved unfinished work even when it is not truly blocked. This is a systemic coordinator/protocol/adapter enforcement gap. Adding more static L0 prompt text is not the primary solution.
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A capability restriction is not automatically a task blocker. For example, code/issue/live authority being prohibited does not permit an owner to stop authorized design or contract work.
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## 1. Coordinator continuity state
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Persist for every assignment:
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- `task_id`
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- `assignment_id`
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- `assignment_generation`
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- opaque non-reusable `assignment_fence_token`
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- `work_status`
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- `owner`
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- `next_action`
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- `authority_scope`
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- `allowed_capabilities`
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- `prohibited_capabilities`
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- `completion_condition`
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- `handoff_target`
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- `handoff_ack`
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- `last_progress_at`
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- `inactivity_ttl`
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- `blocker_code` and evidence when blocked
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- checkpoint/receipt references and contracts digest
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Coordinator invariants:
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- approved unfinished work cannot enter IDLE/TERMINAL with no owner and next action;
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- ownership transfers only through compare-and-swap after explicit challenge-bound ACK;
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- partial authority is evaluated per next action, not treated as a blanket blocker;
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- inactivity watchdog continues, nudges, quarantines, or reassigns work according to policy;
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- coordinator is the only authority that changes RUNNING/blocked/handoff state.
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## 2. Generation-bound continuation message
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Every assignment/continuation envelope includes a structured block:
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```yaml
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continuation:
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work_status: authorized_unfinished | blocked | completed | handoff_pending
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owner: <logical owner>
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next_action: <bounded next action>
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allowed_capabilities: [...]
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prohibited_capabilities: [...]
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completion_condition: <objective terminal condition>
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reply_required: true
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handoff_ack_required: true
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inactivity_ttl_seconds: <n>
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assignment_generation: <monotonic generation>
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assignment_fence_token: <opaque non-reusable token>
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contracts_digest: <digest>
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ack_challenge: <single-use challenge>
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```
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ACK binds task ID, assignment ID, generation, fence token, contracts digest, scope, holds, challenge, and next action. It is single-use and replay-protected. Stale messages are rejected and audited, never replayed into a new generation.
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## 3. Runtime/harness termination semantics
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Adapters report:
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- process/session identity and generation;
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- idle/foreground/pending-message state;
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- `agent_settled`/equivalent state;
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- session/process termination reason;
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- authorized unfinished assignment at termination;
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- checkpoint and handoff ACK state.
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Coordinator decides whether to continue/relaunch/reassign/quarantine. Adapter cannot declare completion.
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## 4. Pi augmentation
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Pi documentation establishes:
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- `agent_end` is too early because retry, compaction, or queued follow-up may remain;
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- `agent_settled` is the correct idle integration point;
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- `session_shutdown` reports quit/reload/new/resume/fork but is not cancellable;
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- `session_before_switch` and `session_before_fork` can cancel unsafe replacement/fork;
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- `pi.sendUserMessage()` can trigger a continuation turn;
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- extension errors are non-fatal, so the coordinator must remain enforcement authority.
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Proposed Pi behavior:
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1. At `agent_settled`, query/validate the generation-bound coordinator assignment receipt.
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2. If assignment is authorized+unfinished, no objective blocker exists, no accepted handoff exists, and no pending message exists, report `continuation_required` and inject one coordinator-signed continuation message using `pi.sendUserMessage()`.
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3. Use bounded retry/challenge IDs to prevent loops. Extension never invents next action or authority.
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4. At `session_before_switch`/`session_before_fork`, cancel when active unfinished work lacks a coordinator-authorized generation swap or accepted handoff.
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5. At `session_shutdown`, emit an unfinished-work termination receipt. Shutdown cannot be mechanically canceled by this event; coordinator watchdog must relaunch/reassign/quarantine.
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6. Do not infer assignment truth from `docs/TASKS.md`, mission JSON, heartbeat, tmux name, or LLM text. Use coordinator SOT/envelope.
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7. Current `turn_end` heartbeat `ok` means not executing a turn, not assignment-complete. Add separate assignment continuity status.
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Equivalent semantics are required in Claude/Codex/OpenCode adapters using their trustworthy lifecycle hooks; unknown capability fails closed.
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## 5. Safety and conformance tests
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Mandatory:
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- design-only authority continues while code/issue/live capabilities are prohibited;
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- partial authority is not reported as blocker when next action is authorized;
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- no silent parking of approved unfinished work;
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- handoff without ACK does not transfer ownership;
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- replayed ACK rejected;
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- inactivity watchdog fires and produces deterministic continue/quarantine/reassign receipt;
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- adapter termination with unfinished work is reported;
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- Pi `agent_end` does not prematurely continue while retry/follow-up remains; `agent_settled` does;
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- pending messages prevent duplicate continuation injection;
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- user `/new`, `/resume`, `/fork`, `/clone` is denied during active work unless coordinator authorizes swap/handoff;
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- Ctrl+C/SIGTERM/session shutdown produces unfinished termination receipt and watchdog recovery;
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- stale generation/fence rejected at every side-effect executor;
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- forged completion/blocker/idle/handoff ACK rejected;
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- coordinator crash at each continuation/transfer step is idempotently recovered;
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- checkpoint confidentiality and retention controls hold across reassignment.
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## 6. Sequencing and ownership
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Add this as a mandatory workstream in the separate session-boundary parent epic:
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1. continuity contract/threat-model amendment;
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2. coordinator persistence schema + invariants/watchdog;
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3. generation-bound continuation/ACK protocol;
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4. adapter termination/settled capability registry;
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5. Pi extension augmentation, then Claude/Codex/OpenCode parity;
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6. conformance and crash/replay tests;
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7. monitoring/runbooks;
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8. isolated canary/rollback.
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Ownership remains:
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- Coordinator: canonical continuity state, watchdog, transfer, RUNNING/blocked/completed authority.
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- Adapters: lifecycle observations, process mechanics, signed receipts; no state authority.
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- Gateway/transport: generation-bound delivery only.
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- Fleet/roster: declared capabilities/lane identity only.
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- Skill/L0: documentation/reminder only.
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