Add code exec behavior harness#52
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This was referenced May 13, 2026
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Summary
tools/code-exec-harnessrunner for isolatedcode exec --jsonscenariosCODE_HOME/CODEX_HOME, isolatedHOME/XDG shell state, external skill roots, fakegh, raw event capture, token/tool summaries, and optional auth inheritance for live runsgithub-plan-smokescenario that validates the harness against a fake GitHub issue list__pycache__artifactsValidation
python3 -m py_compile tools/code-exec-harness/harness.pypython3 tools/code-exec-harness/harness.py tools/code-exec-harness/scenarios/github-plan-smoke.json --dry-run --skill-root /Users/cbusillo/Developer/codex-skills --inherit-auth./build-fast.shgh:github-plan-smokepassed, fakegh issue listwas intercepted, and token usage was captured insummary.jsonHOME/XDG state into the run directory