preserve fork prompt cache state#20909
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(cherry picked from commit 61807cc)
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Closing this pull request because it has had no updates for more than 14 days. If you plan to continue working on it, feel free to reopen or open a new PR. |
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Summary
Preserves prompt-cache state when Codex starts a forked agent.
Forked agents usually reuse a long prefix of the parent conversation. This PR carries the parent prompt cache key, previous response ID, MCP tool snapshot, and response-continuation state into fork startup so the backend can reuse cached prefix tokens instead of treating the fork as an unrelated request. The change also keeps environment gates for disabling the two experimental fork-cache behaviors during debugging.
Validation
CODEX_SKIP_VENDORED_BWRAP=1 cargo build -p codex-cli --bin codex