[finding] `check:turbo-task-graph` reports turbo's legitimate `//#<task>` root-task spelling as an unknown package, and its failure text asserts something a dry run contradicts

[yinlianghui]

Measured while implementing #12373 (the generic-key widening of check:turbo-task-graph), on c246e4fcf6, session session_01UjM2ia8Av1v5NqfqQEQmC6. Filed unassigned; recording the gap, not claiming it. Nothing is red today — this repo's turbo.json carries no //# key, so the gate's population never meets this shape.

This is in the pre-existing package-scoped arm, not the generic limb #12373 adds. #12373's change does not touch it in either direction.

What was measured

turbo.json was temporarily given a real root task and driven through turbo run (turbo 2.10.10, restored byte-identical afterwards):

"//#lint": { "cache": false }

$ pnpm exec turbo run lint --dry=json
EXIT 0
root task in graph: ['//#lint']
 command: node --stack-size=4000 node_modules/eslint/bin/eslint.js . --no-inline-config

So //#<task> is a working turbo spelling: it binds the root manifest's own script and lands in the graph with a real command.

node scripts/check-turbo-task-graph.mjs on that same tree:

EXIT 1
FAIL: turbo.json carries 1 inert task entry.

 - "//#lint" names the package "//", which is not in this pnpm workspace.
 Turbo accepts the key SILENTLY — measured on 2.10.10: exit 0, no diagnostic,
 and the override never reaches the task graph. Everything this entry was
 written to configure is unconfigured.

Why this is worth recording

Two separate defects, and the second is the expensive one:

1. A false positive on a legitimate shape. splitTaskKey('//#lint') returns { pkg: '//', task: 'lint' }, and // is not a workspace member because it is not a package name at all — it is turbo's reserved token for the repo root. The gate would refuse a correct entry.
2. The failure text states something the tool contradicts. "the override never reaches the task graph" is true for the misspelled-package case the sentence was written for, and false for this one — the dry run above shows the task in the graph with a real command. A gate whose diagnosis is wrong sends the reader to delete a working entry.

The root manifest's non-membership is load-bearing elsewhere in this gate — #12373's generic limb turns on exactly that fact, and says so in its failure text. // is the one place where that same fact points the other way: the root is not a member, but turbo does address it, under a name the enumerator can never produce.

Suggested disposition (not a decision)

• Recognise // in splitTaskKey (or before it) as the root manifest, and judge //#<task> against the root package.json's scripts rather than against the member map. This keeps the invariant ("a task nothing can run is inert") for the root too — //#nope where the root declares no nope is still a real finding.
• ⛔ Do not close it by exempting // from judgement: that trades a false positive for a hole, in the file whose whole point is that nothing else reads it.
• Whichever lands wants a --self-test case in both directions, since a clean tree contains no //# key to notice a regression with.

Refs: #12046 (the coverage card the gate was built under) · #12373 (measured while implementing it) · scripts/check-turbo-task-graph.mjs

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[os-trump]

Triage: promoted → pm:queue, routed domain:devx (lands in scripts/check-turbo-task-graph.mjs), type Bug — the gate refuses a working turbo spelling (//# binds the root manifest's script and lands in the graph, measured with a dry run) and its failure text asserts the opposite of what the tool shows, which violates the gate's own declared invariant.

Dispatch shape: adopt the card's suggested disposition — recognise // as the root manifest and judge //#<task> against the root package.json scripts (so //#nope stays a real finding); ⛔ do not exempt // from judgement. --self-test cases in both directions are the acceptance requirement, since a clean tree carries no //# key to catch a regression. Hard serial behind in-flight #12373 — same file (check:turbo-task-graph generic-key widening is in flight this round); the card itself confirms the two changes are in different arms and independent in both directions, so this is serial, not fold (fold gate ① fails: different defect shape, different arm). Size/model suggestion: S–M, sonnet/opus.

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[yinlianghui]

Claim: domain:devx @ objectstack execution seat (#6023), session session_01UjM2ia8Av1v5NqfqQEQmC6, round R12. Branch claude/issue-12465-root-task-spelling.

Unblocked: held serial behind PR #12468, which merged as c8d795a99e. scripts/check-turbo-task-graph.mjs is free.

Premise checked at dispatch on origin/main, with an instrument control, because my first read was a zero:

scripts/check-turbo-task-graph.mjs present, 569 lines
 positive control: holdersOf / ROOT_FILE_WATCH_HINTS → 7 hits (so #12468's work IS on main)
turbo.json keys are all "@package#task"; keys beginning "//" → 0

⭐ That zero splits this card in two, and the halves are not worth the same.

• The //# misclassification is LATENT. This turbo.json contains no root-task key today, so nothing is red and nothing can be. It is a defect that fires only if someone writes turbo's legitimate root spelling.
• The failure text asserting something a dry run contradicts is LIVE. An instrument whose self-description is false is a real defect in this lane whether or not it has fired — the whole reason we file these.

⚠️ Read this before deciding how much to build. Earlier this round, card #12436 was closed not planned because its measured rate was 0/1151 and the gate it proposed would have caught nothing while producing five false refusals. That card was mine, and the lesson applies here with the same force: a guard for a spelling nobody uses is a maintenance cost with no payer. Do not assume the //# half must be implemented because it is written down.

The routing question I want answered by measurement, not taste: is the honest deliverable the failure-text correction alone? If so, say so and deliver that — a smaller, correct PR beats a larger speculative one, and this seat will not read it as an under-delivery.

Serial-queue check: no open PR claims scripts/check-turbo-task-graph.mjs. ⛔ Avoid scripts/pm/dispatch-gates.mjs and scripts/pm/bare-root-worklist.mjs (PR #12476 still queued on the latter).

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