fix(copilot): strip replayed thinking blocks#92830
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Co-authored-by: Gio Della-Libera <[email protected]>
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ClawSweeper status: review started. I am starting a fresh review of this pull request: fix(copilot): strip replayed thinking blocks This is item 1/1 in the current shard. Shard 0/1. This placeholder means the worker is alive and reading the current context. I will edit this same comment with the actual review when the claws are done clicking. Crustacean status: shell secured, claws on keyboard, evidence pebbles being sorted. |
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Land-ready proof for SHA
Known proof gaps: no live account access to other Copilot Claude model ids; no native cross-OS app flow. The exact affected Copilot Anthropic transport and both official provider tool paths were exercised live. |
This was referenced Jun 14, 2026
This was referenced Jun 14, 2026
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Summary
thinkingandredacted_thinkingblocks from every GitHub Copilot Claude replay turn through the provider-owned sanitizer[assistant reasoning omitted]This is a smaller current-main replacement for #87060 and #81534, based on Gio Della-Libera's provider-owned fix direction.
Fixes #81520
Real behavior proof
Behavior addressed: GitHub Copilot Claude rejects follow-up requests when prior assistant thinking blocks are replayed.
Real environment tested: macOS checkout on commit
19bd9a205d; authenticated GitHub Copilot Anthropic Messages request againstapi.individual.githubcopilot.com; official OpenAI and Anthropic gateway agent/tool probes.Exact steps or command run after this patch: focused GitHub Copilot tests; production/test typing; touched-file format/lint; live Copilot replay harness with an intentionally invalid prior thinking signature; gateway live model suite narrowed to
openai/gpt-5.5andanthropic/claude-sonnet-4-6.Evidence after fix: Copilot
claude-haiku-4.5sent a three-message follow-up payload withpayloadContainsThinking: falseand returned exactlyCOPILOT_REPLAY_OK. The GitHub Copilot suite passed 10 files / 106 tests. Official Anthropic passed prompt,read,exec+read, image, and refusal/tool-continuation probes. Official OpenAI passed prompt,read,exec+read, and image probes.Observed result after fix: Copilot receives no replayed thinking content, while visible assistant text, tool calls/results, and turn structure remain intact.
What was not tested: other account-gated Copilot Claude models were not available. The existing OpenAI tool-call-only edge probe timed out and was skipped after the normal OpenAI tool probes passed; that current-main behavior is separate from this Copilot-only diff and will be investigated independently.
Verification
pnpm test extensions/github-copilot-> 10 files, 106 tests passedpnpm tsgopnpm check:test-typesoxfmtand type-awareoxlintgit diff --checkCo-authored-by: Gio Della-Libera [email protected]