Issue #2015: product-code executor tasks were repeatedly routed to a
liaison-only agent because every routing path gated only on the coarse
role field, and several binding primitives had no guard at all.
- Add runtimeConfig.assignmentPolicy ("auto" | "explicit-only" | "none");
"none" can never be bound to implementation tasks by ANY path — no
override bypasses it (the liaison guarantee)
- Route every binding surface through one shared evaluator
(evaluateImplementationTaskBind): claimTaskForAgent, the previously
unguarded checkoutTask/assignTask primitives, selectNextTaskForAgent
(including the in-progress re-selection loop), scheduler auto-assign
pool, heartbeat inbox/auto-claim, fn_delegate_task, CLI agent-id
validation, and dashboard assign/checkout/inbox routes
- Lock project isolation with a regression test: a foreign-project
agent id is rejected by every binding primitive
- Expose Assignment Policy in Agent Detail settings; document in
docs/agents.md; add changeset
Fusion-Task-Id: FN-7851
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Importing a catalog ("company") agent assigns role "custom", which the
scheduler never auto-assigns mission/queue work to. Combined with a
model/provider that rejects the "developer" system role, this surfaced as
an invisible, repeating failure loop (GitHub #1261).
- pi.ts: treat an unsupported message-role rejection as a model-selection
error so a configured fallback model is tried once (single-swap guarded)
before the task is marked failed.
- mission-autopilot.ts: block a mission feature immediately on an
operator-actionable failure instead of burning the retry budget
re-running the same cryptic error.
- mission-routes.ts: preflight mission start — when ephemeral agents are
disabled and no eligible executor exists, fail fast with an actionable
message instead of queueing tasks forever.
- agent import route + AgentImportModal: warn when only custom-role agents
are imported and no executor exists.
- agent-assignment.ts: extract shared listEligibleExecutorAgents helper.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
