fix(mcp): say when a write only reached the local fallback store

[dmazhukov]

Write results from the @agentmemory/mcp local fallback now say they are local. memory_save and memory_governance_delete add storage: "local" and a warning: the server did not confirm the call, and the change went to the fallback file the server never reads, or to memory that is lost on exit.

When livez or a proxied call fails, the shim writes to ~/.agentmemory/standalone.json and replied {"saved": id}, which reads as a successful save. The fallback was announced only on stderr, and nothing copies that file to the server. In #1552 the engine hung for six days while the agent kept confirming memories later sessions could not find.

Fallback reads stay unmarked: local memory_sessions must match the REST response exactly.

Fixes #1552

Summary by CodeRabbit

• New Features
  • Local fallback responses for saving or deleting memories now identify the result as local and include a warning that the server did not confirm the request.
  • Warnings distinguish between changes saved to a local file—which the server does not read—and in-memory changes that are lost when the process exits.
  • Save responses continue to include the saved ID, and delete responses include deletion details.

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[coderabbitai]

📝 Walkthrough

persist() now reports whether a local file write succeeded. Local fallback responses for memory saves and governance deletes include storage details and warn that the server did not confirm the call.

Changes: Local fallback reporting

Layer / File(s)	Summary
Report local persistence outcome src/mcp/in-memory-kv.ts	persist() returns false when no persistence path exists or writing fails, and true after a successful write.
Add storage details to fallback responses src/mcp/standalone.ts, test/mcp-standalone.test.ts, test/mcp-standalone-proxy.test.ts	Save and governance-delete fallback responses report whether data was written to a local file or remains in memory. Tests cover these responses and verify the proxied save result.

Priority: ➖ Normal

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Bug fix · Severity of issue fixed: Medium

Suggested reviewers: rohitg00

Merge Risk: 🟡 Moderate · up to e8d6c

Fallback tool responses can reveal credentials embedded in the configured server URL. Redact the URL before merging.

Pre-merge checks: 4 · 1

Failed checks: 1 warning

Check name	Status	Explanation	Resolution
Docstring Coverage		Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 3 functions across 4 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

Passed checks: 4 passed

Check name	Status	Explanation
Description Check		Check skipped - CodeRabbit’s high-level summary is enabled.
Title check		The title clearly and concisely describes the main change: informing clients when a write reaches only the local fallback store.
Linked Issues check		Issue #1552 requires the client to avoid false confirmation when a save is not confirmed by the server or durable state. The fallback memory_save and memory_governance_delete responses now include…
Out of Scope Changes check		The changed files support the linked objective. The boolean persistence result enables accurate fallback warnings. The tests verify the new save and delete response metadata and preserve proxy behavio…

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Actionable comments posted: 1

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• 🪄 Fix comments: Fix CodeRabbit comments on this PR

🤖 Prompt to fix review comments

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Inline comments:
Review comments at @src/mcp/standalone.ts:
- Line 329: Update the warning used by the memory_save and
memory_governance_delete tool responses to avoid calling displayAgentmemoryUrl()
or otherwise including the server URL; keep the message focused on the server
not confirming the call and retain the store context if needed.

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ℹ️ Review info

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📥 Commits

Reviewing files that changed from the base of the PR and between 36eb328 and e8d6c7f.

📒 Files selected for processing: 4

• src/mcp/in-memory-kv.ts
• src/mcp/standalone.ts
• test/mcp-standalone-proxy.test.ts
• test/mcp-standalone.test.ts

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