[jayhemnani9910]

Summary

Codex writes a tool output either as a string or as a list of content items (FunctionCallOutputBody = string | Array<FunctionCallOutputContentItem> in its protocol types). The list form shows up for tools that return images and for the JS REPL (exec): [{"type":"input_text","text":"..."},{"type":"input_image","image_url":"data:..."}]. The Codex reader does String(payload.output ?? '') (src/session-flow/adapters/codex.ts:559), so every list output becomes [object Object],[object Object] after migration or archiving.

This PR joins the input_text parts with \n, the same way the Claude Code reader flattens a tool_result array. String outputs are unchanged.

Type of Change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature causing existing behavior to change)
• Documentation only
• Refactor / internal cleanup

Test Plan

• npx tsc --noEmit passes
• npm run lint passes
• npx vitest run passes (10796 pass; the same 6 tests fail on main here: two submodule-checkout cases that need git >= 2.54 (local 2.53), one hooks-reconcile-scope real-shell case, and three Cursor tests that need a sqlite3 CLI this machine does not have)
• Added/updated tests for the change

New test in session-cmd.test.ts: a Codex rollout whose function_call_output is a list of two input_text items and one input_image must read back as Output:\ndone. On main it reads back as [object Object],[object Object],[object Object].

Real CLI with a throwaway HOME, migrating one of my Codex sessions (codex-cli 0.163.0, 52 tool outputs, all lists) with teamai session migrate <id> -s codex -t claude-code -y:

0.28.0-beta.5:  52 of 52 tool results are "[object Object],[object Object]"
this branch:     0 of 52

Related Issues

Follow-up to #593.

Notes for Reviewers

Images in a list output are dropped, as the Claude Code reader drops them from tool_result arrays. An image-only output (view_image) reads back as an empty string. If you would rather keep a marker such as [image] for each input_image, I can add it.

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[github-actions]

No findings in the specified diff.

The change preserves string outputs and joins text items from list outputs, with a regression test covering mixed text/image content.

The PR description includes sufficient testing: a representative real-CLI migration reports 0 of 52 corrupted tool results on this branch, versus 52 of 52 previously.

Review was read-only; I did not run, build, or install PR code.