test(agents): add disabled GPT-6 Astra fixture backend

[Copilot]

Canonical issue

Linked by PR automation.

Outcome

Adds a disabled-by-default GPT-6 Astra fixture backend for Agent Factory evaluation, focused on async tool-call semantics rather than live provider execution. The new path records pending call_id state, enforces provenance-bound authorization and cross-run isolation, and emits a machine-readable comparison artifact alongside the existing native and Antigravity paths.

• Fixture backend contract

  • Adds /home/runner/work/EventRelay/EventRelay/src/youtube_extension/services/agents/astra_backend.py
  • Models Astra response handling, async function calls, token/output caps, cost estimation, and terminal blocked/cancelled states
  • Keeps live execution gated off by default

• Authorization and isolation

  • Requires immutable control records to authorize async tool calls or steering updates
  • Partitions pending-call state by origin, task_id, and run_id
  • Rejects plain-text GO, peer/shared-state messages, mismatched call_ids, and cross-run callback reuse

• Pending-call durability

  • Persists pending tool-call metadata in a fixture store before result application
  • Makes result submission idempotent
  • Revokes late results after safety stop / terminal state

• Steering and receipts

  • Maps mid-turn steering to append-only instruction-update events
  • Preserves original request and completed receipt lineage
  • Records provider configuration_update events in execution receipts

• Coverage

  • Adds /home/runner/work/EventRelay/EventRelay/tests/unit/test_astra_backend.py
  • Covers slow-tool continuation, restart semantics, duplicate/mismatched results, token/media fail-closed behavior, authorization injection attempts, and safety-stop handling

control = AstraControlRecord(
    issuer="eventrelay-control-plane",
    scope="origin:video-pack",
    run_id="run-1",
    task_id="task-1",
    allowed_action="tool_call",
    expires_at="2099-01-01T00:00:00+00:00",
    nonce="nonce-1",
    receipt_locator="receipt://control/tool-call",
)

receipt = await AstraBackend(config, transport, store=store).execute(
    "Review evidence",
    {"stable_run_id": "run-1"},
    origin="video-pack",
    task_id="task-1",
    control_record=control,
)

Scope

• Included:
  • Optional disabled Astra fixture adapter
  • Provenance-bound authorization checks
  • Origin/task/run pending-call partitioning
  • Idempotent tool-result application
  • Append-only steering updates and comparison artifact
  • Focused unit coverage for the new backend and adjacent regression surface
• Explicitly excluded:
  • Live Astra API calls
  • Deployment, billing, or spend changes
  • Broader Agent Factory runtime refactors
  • Production benchmark execution

Risk

• Risk level: medium
• Failure mode:
  • Fixture contract diverges from the intended provider behavior
  • Overly strict authorization or callback validation blocks future adapter wiring
• Rollback:
  • Revert /home/runner/work/EventRelay/EventRelay/src/youtube_extension/services/agents/astra_backend.py
  • Revert /home/runner/work/EventRelay/EventRelay/tests/unit/test_astra_backend.py

Verification

List exact automated and manual checks, tied to the current head SHA.

• Focused tests — python -m pytest tests/unit/test_astra_backend.py tests/unit/test_antigravity_backend.py --no-cov -q on 23ac4cb0cd4ee551d44afdfa2b80eab2b907190d
• Required CI — awaiting repository-required GitHub Actions on 23ac4cb0cd4ee551d44afdfa2b80eab2b907190d
• Review threads resolved — no open review threads on 23ac4cb0cd4ee551d44afdfa2b80eab2b907190d

Production evidence

Not applicable. This change is fixture-only, disabled by default, and intentionally excludes live provider execution, deploys, and paid benchmarks.

Agent handoff

• One canonical issue is linked
• No competing PR implements the same issue
• Acceptance criteria are satisfied
• Required checks pass on the current head
• Human decision is requested only for product, security, irreversible infrastructure, or production approval

• Fixes test(agents): evaluate GPT-6 Astra async execution backend #1662

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Project	Deployment	Actions	Updated
v0-uvai	Canceled		Sep 9, 2026 6:44am UTC

[github-actions]

🔍 PR Validation

⚠️ Large PR detected (1325 lines changed)

[github-actions]

Dependency Review

✅ No vulnerabilities or license issues or OpenSSF Scorecard issues found.

Snapshot Warnings

⚠️: No snapshots were found for the head SHA a6e46a4.

Ensure that dependencies are being submitted on PR branches and consider enabling retry-on-snapshot-warnings. See the documentation for more information and troubleshooting advice.

Scanned Files

None

[groupthinking]

Execution receipt — 2026-09-09 — TEST

Advanced this existing draft rather than opening competing work for #1662.

Verified input: head 23ac4cb0cd4ee551d44afdfa2b80eab2b907190d. Offline lifecycle tests reproduced seven failures: expired/malformed deadlines accepted, repeated provider calls resetting applied results, cancelled runs reopening, completed-receipt dictionary keys leaking into receipts, prior receipt snapshots mutating, and changed-input call_id reuse accepted.

Implemented:

• Preserve pending-call state/deadline on matching provider retries; reject changed input/policy.
• Reject terminal-run reuse before transport.
• Reject invalid/expired pending-call deadlines.
• Snapshot pending calls/events and return actual completed receipt locators.
• Keep plaintext-GO/cross-origin tests; use a new run after a terminal denial.

Commits: ae6d2bb0ffdf5e444f2e120f67db7af876f35862, fe4e3f8031e84140788688f17aad14c22abb0a53, a6e46a445d232e8140b559557989420448637caf.
Verification: all three resulting files fetched at the final commit and matched tested bytes. Focused pytest suite: 15 passed (seven existing tests plus eight lifecycle regressions), offline Python 3.12. This is NOT the full repository suite. Current-head CI has started; earlier Copilot-head workflows were action_required.

Remaining acceptance gaps (do not claim production readiness):

1. Control-record issuer-string comparison is not independently verified provenance; bind records to trusted authorization storage and enforce nonce/revocation semantics.
2. Reusing one in-memory store across backend objects is not durable process restart persistence.
3. Comparison fields hard-code idle time/duplicate rate; mark unmeasured data unknown and run a real comparison before asserting gains.
4. Token/output caps and network policy need independently enforced execution-path checks, not only caller estimates or post-result declarations.

Owner: Agent Factory implementation/review for #1662. State: fixture lifecycle repair verified; broader security/durability acceptance remains open. Next: inspect current-head CI, then address those bounded gaps with negative tests. No merge, production deployment, or paid provider invocation performed.

[groupthinking]

Current-head verification update — 2026-09-09

At a6e46a445d232e8140b559557989420448637caf, CI3844 now passed, including frontend tests, TypeScript/build, guards and Python tests.

Python job log: 8,234 passed, 6 deselected, 5 xpassed, 102 warnings. This does not erase warnings or imply live-provider verification.
Security, CodeQL and secret scanning passed. Dependency review reports success but also warns that no head snapshots were available; do not treat it as full dependency coverage.
Coverage34320454842 is still running at this check; E2E was skipped. Original lifecycle/security acceptance limitations in receipt5597354814 remain open. Draft and unmerged verified.