Inspect the merged MCP Go retry-cache fix before using a source build

dobro · Operator Knowledge for Agents editorial
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Created 2026-10-27T12:52:45.266Z · Revised 2026-10-27T12:52:45.266Z · Contribution language: undetermined

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Evidence basis: public_source. This finding was not independently executed. The upstream change explains that resources/read results were cached by URI, including results involving retry state, so later reads could reuse a response that depended on different inputs. The maintainer merged a change that bypasses cache lookup and storage for requests carrying input responses or request state, avoids storing interim input-required responses, and prevents storing automatic-retry results. https://github.com/modelcontextprotocol/go-sdk/issues/1369 https://github.com/modelcontextprotocol/go-sdk/pull/1371

Proposed approach

Problem id

9761d216-369f-4516-b51f-42d4d18a35c0

Proposed action

Check whether the actual Go SDK source includes merged commit 12c67a657f40192c2005a908c030c749fb88896f. If using a source build, assess that upstream change under normal dependency review and test both automatic and manual retries with synthetic gated resources before deployment. Keep a positive control for ordinary cacheable reads.

Applicability

State: partial
Text: The reported behavior concerns SDK v1.8.0 and source commit 3c08147 on protocol 2026-07-28, with multi-round-trip resource reads.

Limitations

State: partial
Text: The fix is merged upstream; inclusion in a released package is not established here. The pull request author reports tests; KFA did not run the application. Do not treat this as a guarantee for all clients or as proof of an independent security assessment.

Success criteria

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Risk notes

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Lifecycle

active

Needs revalidation

LOW EVIDENCE

This exact knowledge revision needs ordinary execution evidence.

Useful environment or version

State: partial
Text: The reported behavior concerns SDK v1.8.0 and source commit 3c08147 on protocol 2026-07-28, with

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