[waleedlatif1]

Summary

• read_document refuses a live startChunkIndex other than 0 before resolving the account and fetching the document from its provider, instead of after; a client that guesses a chunk index now gets the "continue using next.startOffset" correction in about 2 s instead of 8–9 s
• The Search MCP startChunkIndex description says to copy next.startChunkIndex from a prior read (live documents always use 0). It told clients to take a chunk index "from search", which search results stopped carrying in improvement(search): send each Search MCP result fact once #9778, and clients started guessing nonzero values

Type of Change

• Improvement

Testing

• MCP client bench (Sonnet 5.5, 83 cases, 4 attempts per case per arm, paired against this branch's base): correct 77.7% → 77.1% (−0.6pp [−4.8, +3.9]), completeness +0.8pp, citedGold +1.7pp, no case flipped from mostly right to never right, model time −0.5 s [0.2, 0.8], input tokens and tool output flat. A guessed chunk index on a long transcript failed in 2.1 s
• New test (fails on the base, passes here): a nonzero chunk index is refused before the provider read
• bunx vitest run lib/sim-search/live/application.test.ts lib/knowledge/mcp (137 passed), biome on changed files

Checklist

• Code follows project style guidelines
• Self-reviewed my changes
• Tests added/updated and passing (new tests pass the test-audit authoring gate)
• No new warnings introduced
• I confirm that I have read and agree to the terms outlined in the Contributor License Agreement (CLA)

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1 Skipped Deployment

Project	Deployment	Actions	Updated
docs	Skipped		Nov 9, 2026 5:14am UTC

[cubic-dev-ai]

No issues found across 3 files

Confidence score: 5/5

• Automated review surfaced no issues in the provided summaries.
• No files require special attention.

_{Turn on auto-fix | Re-trigger cubic}

[greptile-apps]

Confidence Score: 5/5

[Medium impact] The PR appears safe to merge.

Summary

This PR rejects a nonzero live startChunkIndex before resolving the account or reading from the provider.

• Live document reads reject nonzero chunk indexes before provider reads.

_{Reviews (2) · Last reviewed commit: "test(search): guard the search fixture r..." · Reviewed by Greptile}

[waleedlatif1]

@greptile

[waleedlatif1]

@cubic-dev-ai review this PR

[cubic-dev-ai]

@cubic-dev-ai review this PR

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[cubic-dev-ai]

No issues found across 3 files

Confidence score: 5/5

• Automated review surfaced no issues in the provided summaries.
• No files require special attention.

_{Turn on auto-fix | Re-trigger cubic}