[oddharsh]

Gotcha 27 claimed twice that this check fails on every diff, and one of those claims went in a few hours ago (#403) as the general lesson. It is wrong, and the correction is more useful than the claim was.

The run always fires. Whether it requests a model depends on the diff, and the discriminator is a file exclusion list the job prints on every run:

FileExclusionPatterns = *.c,*.cpp,*.cs,*.go,*.h,*.html,*.java,*.js,*.json,
*.jsx,*.kt,*.mjs,*.mts,*.py,*.rb,*.rs,*.ts,*.tsx,*.vue,*.xml,*.yaml,*.yml,
**/action.yml,*.github/workflows/*.yml,Cargo.toml,Gemfile

.md, .sh and .css are not on it. A docs diff survives the filter and draws a claude-opus-4.6 request; a pure JavaScript diff is filtered to nothing and the run exits clean.

So on this repo the check fails on documentation and passes on code, which is the inverse of what "code scanning" predicts, and it is why a gotcha that grew mostly on docs PRs saw an unbroken run of failures.

One trap worth recording: both paths print Sessions disabled: not supported for code scanning yet, so that line is noise. The discriminating line is Creating copilot-sdk session with model, which only the failing path reaches.

Correlates 12 of 12:

PR	extensions	survives	outcome
#399	jpg, json	no	success
#402	js, mjs	no	success
#398	md	yes	failure
#400	json, md, sh, yml	yes	failure
#401	md	yes	failure

Plus all seven earlier failures checked backwards: #305, #307, #351 and #368 carried .md; #313 is the "CSS-only" diff this gotcha already singles out; #319 and #340 carried both.

The prose-only argument keeps its conclusion and loses its mechanism. A docs PR reddens this because markdown is one of the few things the detector still looks at, rather than because the agent read the prose and choked. The entitlement root cause from #403 is untouched: every failure is still CAPIError: 400 on a model a 0-credit Free account cannot be served.

Also records the method failure, which is the transferable part. Nine entries were built by pattern-matching outcomes across PRs without ever reading which files each diff touched, and "fails on everything" was an artifact of that sample. One uncollected column explained the whole shape.

Docs only. pnpm run lint exits 0 and no served byte moves.

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Status	Name	Latest Commit	Updated (UTC)
✅ Deployment successful! View logs	aadhar-sh	421142e	Aug 16 2026, 12:11 AM