fix(sdk-rust): preserve final 5xx diagnostic and bound Retry-After - #375
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HttpClient::request's retry loop slept after its final attempt too, then fell through to a hardcoded "Max retries exceeded" error that discarded the last response's real status, code, and message. A retryable 5xx is now retried using a bounded Retry-After delay (capped at 5s) when the server sends one, and the final attempt's diagnostic — status, structured API code/message (or a raw-body summary for a non-JSON error body), correlation/request id, and attempt count — is preserved and returned as a still-retryable RelayError::Api instead of being erased. Fixes #374.
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📝 WalkthroughWalkthroughThe Rust SDK now bounds ChangesRust SDK retry diagnostics
Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: 🟠 High · up to The improved retry diagnostics are useful, but retrying POST or PATCH requests after ambiguous 5xx responses can duplicate remote state. Unsafe retries should be gated by method or idempotency key before merge; the changelog also needs concise impact-first entries. Sequence Diagram(s)sequenceDiagram
participant HttpClient
participant RelayServer
participant RelayError
HttpClient->>RelayServer: Send request
RelayServer-->>HttpClient: Return retryable 5xx with headers
HttpClient->>HttpClient: Parse Retry-After and request ID
HttpClient->>RelayServer: Retry before final attempt
RelayServer-->>HttpClient: Return terminal response
HttpClient->>RelayError: Create diagnostic API error
Suggested reviewers: Poem
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✅ Passed checks (4 passed)
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Addressed the two Cubic findings at 8703c08.
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Follow-up at a7bf789: terminal SDK retry metadata is now also retained by |
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Fresh review head: 88ae148. Removed the remaining wall-clock final-sleep assertion as well: retry eligibility is a deterministic helper with explicit final-attempt coverage, while the integration test still proves terminal structured diagnostics. |
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Inline comments:
In `@packages/sdk-rust/CHANGELOG.md`:
- Around line 13-14: Update the changelog entries to use concise, impact-first
bullets: split the retry behavior and final-error-reporting changes into
separate user-visible bullets, remove the internal InvalidResponse detail and PR
reference, and shorten the Retry-After entry to state only the shipped behavior
without implementation rationale.
In `@packages/sdk-rust/src/client.rs`:
- Line 286: Update the retry decision around should_retry_server_error so
non-final 5xx responses retry only for idempotent methods, or for unsafe methods
when RequestOptions.idempotency_key is present. Preserve existing retry behavior
for safe requests and add coverage for a mutation that commits remotely before
returning 503.
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packages/sdk-rust/CHANGELOG.mdpackages/sdk-rust/src/client.rspackages/sdk-rust/src/credentials.rspackages/sdk-rust/src/error.rspackages/sdk-rust/src/registration.rspackages/sdk-rust/tests/client_retry.rs
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@coderabbitai review\n\nExact-head 21409e7 addresses the four outstanding findings: concise changelog, safe retry gating, deterministic committed-but-503 coverage, and U+2028/U+2029 sanitization. Local |
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@coderabbitai review\n\nExact head ccb0c89 moves the idempotent/keyed automatic-retry policy to the changelog |
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Pre-merge external cross-client gate passed at exact SDK head A disposable Relay worktree patched Observed: exit 1 in 81 ms; exactly one request; caller-visible Merge remains gated on exact-head arm64 CI, zero unresolved threads, and a fresh Veto review for this SHA. |
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Fresh exact-head Veto gate for
This gate includes the actual Relay broker |
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Status update from my side (independent verification, not relying on the automated review comments above):
Per my instructions I'm not merging this — leaving that to a human maintainer. The one item still outside this PR's scope is the cross-repo |
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Summary
Part of #374.
The Rust SDK retry loop honors a bounded delay-seconds
Retry-Aftervalue for retried 5xx responses, never sleeps after its final attempt, and returns the terminal response as a typed retryableRelayError::Apirather than replacing it withMax retries exceeded. It preserves HTTP status, structured API code/message when available, request or correlation ID, and attempt count. A terminal non-JSON gateway response retains its status plus a bounded, single-line lossy body summary.Automatic 5xx retries now require an idempotent HTTP method or an idempotency key, preventing duplicate unsafe mutations after an ambiguous server failure.
AgentRegistrationClientcarries terminal request ID and attempts into its caller-visibleAgentRegistrationError::Apidetail, so the Relay broker can print it throughmcp-args --register. The cross-repository CLI proof remains a post-publish Relay dependency-upgrade gate; this PR alone cannot alter Relay because it pins the released Rust crate version.RelayError::Apiaddsrequest_idandattemptswith accessors; this is documented in the existing major unreleased Rust SDK changelog.Validation
cargo test --all-targets— 50 unit, 5 retry integration, 43 parity tests, all green.cargo clippy --lib -- -D warnings— green.Full
cargo clippy --all-targets -- -D warningsstill reports two pre-existingclippy::result_large_errfindings in unchangedtests/parity.rscallback closures.