fix(broker): retry Relaycast workspace busy startup admission by khaliqgant · Pull Request #1729 · AgentWorkforce/relay

khaliqgant · 2026-09-09T23:04:44Z

Summary

Retry the narrowly transient Relaycast HTTP 429 workspace_busy response during broker startup/admission.

Only the exact workspace_busy code is retried. Unrelated 429 responses remain terminal. Exhaustion preserves Relaycast diagnostics, and the complete startup handshake remains fail-closed so unkeyed workspace or agent-registration POSTs are not replayed.

Fixes #1728. Related to #1715; this PR does not close #1715 because that issue covers worker /api/spawn preregistration and HTTP 503 database_overloaded.

Test plan

Exact workspace-busy retry succeeds after one transient response
Persistent workspace-busy exhausts at three request attempts
Unrelated 429 remains terminal after one attempt
Complete startup handshake is not replayed
Full broker library: 1,063 passed, 4 ignored
Clippy with warnings denied
Rust formatting and diff checks
Exact RelayFlow base/head case and proof-contract suite

RelayFlow proof

Change type: bugfix
RelayFlow case: workspace-busy-startup-retry-429

chatgpt-codex-connector · 2026-09-09T23:04:53Z

Codex Review Summary

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-09T23:08:46.667051Z	`accf287`	PR opened

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coderabbitai · 2026-09-09T23:05:23Z

No actionable comments were generated in the recent review. 🎉

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📥 Commits

Reviewing files that changed from the base of the PR and between accf287 and ea63547.

📒 Files selected for processing (2)

crates/broker/src/relaycast/auth.rs
tests/relayflows/cases/workspace-busy-startup-retry-429/run.mjs

🚧 Files skipped from review as they are similar to previous changes (2)

tests/relayflows/cases/workspace-busy-startup-retry-429/run.mjs
crates/broker/src/relaycast/auth.rs

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📝 Walkthrough

Walkthrough

The broker now retries bounded Relaycast HTTP 429 workspace_busy admission failures. Unrelated 429 responses remain terminal. Exhausted admission retries preserve diagnostics and do not replay the complete startup handshake.

Changes

Workspace-busy admission retry

Layer / File(s)	Summary
Admission retry classification and bounds `crates/broker/src/relaycast/auth.rs`	The broker recognizes exact HTTP 429 `workspace_busy` errors as transient, bounds retries, preserves diagnostics, and prevents replacement workspace creation after exhaustion.
Startup handshake exhaustion handling `crates/broker/src/relaycast/mod.rs`, `crates/broker/src/runtime/session.rs`	Startup handling distinguishes exhausted admission retries from handshake timeouts and avoids replaying the complete handshake.
RelayFlow proof and release records `tests/relayflows/cases/workspace-busy-startup-retry-429/`, `CHANGELOG.md`, `.agentworkforce/trajectories/completed/2026-09/`	The proof covers retry success, unrelated 429 termination, bounded exhaustion, timeout behavior, and no handshake replay. Release and trajectory records describe the change.

Priority: ➖ Normal

Estimated code review effort: 3 (Moderate) | ~25 minutes

Severity of issue fixed: Medium

Merge Risk: ⚪ Minimal · up to ea635

The broker adds bounded retries for Relaycast workspace_busy admission responses while retaining terminal handling for other 429 responses and avoiding startup-handshake replay. No concrete merge-blocking risk is identified.

Sequence Diagram(s)

sequenceDiagram
  participant Broker
  participant AuthClient
  participant Relaycast
  Broker->>AuthClient: Start admission
  AuthClient->>Relaycast: POST agent registration
  Relaycast-->>AuthClient: 429 workspace_busy
  AuthClient->>Relaycast: Retry within budget
  Relaycast-->>AuthClient: Success or exhausted error
  AuthClient-->>Broker: Admission result
  Broker-->>Broker: Do not replay complete handshake after exhaustion

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 44.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 25 functions across 4 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the primary change: retrying Relaycast workspace-busy startup admission failures.
Description check	✅ Passed	The description includes the summary, test plan, RelayFlow proof type and case, and relevant scope details. The omitted Screenshots section is optional, and heading capitalization does not prevent the…
Linked Issues check	✅ Passed	The PR satisfies the coding objectives in `#1728`: exact workspace_busy retry handling, bounded exhaustion, diagnostic preservation, terminal unrelated 429 behavior, no handshake replay, and an exact Re…
Out of Scope Changes check	✅ Passed	The broker changes, regression tests, RelayFlow case, changelog entry, and trajectory records all support the workspace_busy startup-admission retry objective. No unrelated product behavior is introdu…

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_{A rabbit sees the busy gate,
Three hops, then stops to check its fate.
The matching code gets one more try,
While other limits pass it by.
No spare workspace springs to view,
The handshake stays safely true.}

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Actionable comments posted: 2

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Inline comments:
In `@crates/broker/src/relaycast/auth.rs`:
- Line 969: Update startup_session_set_with_identity to detect
is_workspace_busy_anyhow before the generic rate-limit handling, preserving the
exhausted workspace_busy error when multi-workspace selection fails. In
startup_single_session_set_from_sources, return that preserved error for a
non-explicit RELAY_API_KEY instead of recording a generic rate limit and
creating a new workspace, so connect_relay receives its original status, code,
message, and attempts.

In `@tests/relayflows/cases/workspace-busy-startup-retry-429/run.mjs`:
- Around line 111-122: Update the terminal scenario predicates in the test
around the success, unrelated, and exhaustion results to require timedOut ===
false for each scenario. Extend the exhaustion assertions to require both the
HTTP status 429 and the “workspace admission is busy” response message, while
preserving the existing registration, handshake, and attempt-count checks.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Advanced

Run ID: b5108abe-b274-408e-b032-9f93a34206ec

📥 Commits

Reviewing files that changed from the base of the PR and between 4306bb2 and accf287.

📒 Files selected for processing (10)

.agentworkforce/trajectories/completed/2026-09/traj_q7a7m644yvsi/summary.md
.agentworkforce/trajectories/completed/2026-09/traj_q7a7m644yvsi/trajectory.json
.agentworkforce/trajectories/completed/2026-09/traj_zylcy1hl0sus/summary.md
.agentworkforce/trajectories/completed/2026-09/traj_zylcy1hl0sus/trajectory.json
CHANGELOG.md
crates/broker/src/relaycast/auth.rs
crates/broker/src/relaycast/mod.rs
crates/broker/src/runtime/session.rs
tests/relayflows/cases/workspace-busy-startup-retry-429/case.json
tests/relayflows/cases/workspace-busy-startup-retry-429/run.mjs

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Proactive Runtime Bot added 2 commits September 10, 2026 00:42

fix(broker): retry workspace busy startup admission

8f1f405

test(relayflow): prove workspace busy startup retry

accf287

khaliqgant requested a review from willwashburn as a code owner September 9, 2026 23:04

coderabbitai Bot reviewed Sep 9, 2026

View reviewed changes

Comment thread crates/broker/src/relaycast/auth.rs

Comment thread tests/relayflows/cases/workspace-busy-startup-retry-429/run.mjs

fix(broker): preserve workspace busy admission diagnostics

ea63547

This was referenced Sep 10, 2026

E2E Tests is ~25% flaky on main (4 of last 15 pushes), so a red check on a PR carries little information #1550

Open

RelayFlow PR Proof: ~half of Cloud dispatches die in 'pending' with a 0-byte log, and the trusted base cannot report why #1696

Open

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fix(broker): retry Relaycast workspace busy startup admission - #1729

fix(broker): retry Relaycast workspace busy startup admission#1729
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fix/relaycast-workspace-busy-retry-0910

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