Conciseness

Every section earns its place: a 20-line body with a Trigger, a Fix containing only the working snippet, a one-line dry-run verification, and a two-sentence 'Why' ('make expands `$x` in a variable value... it reads `$'` as an empty variable, so the closing quote disappears') that explains the exact failure mechanism rather than general make knowledge Claude already has. Nothing can be trimmed without losing value.

Actionability

Fully executable and copy-paste ready: the GitHub Actions snippet shows the exact substitution (`make testacc "TESTARGS=-run '${RUN_PATTERN//\$/\$$}''`) including the env var pass-through, and verification is a concrete command (`make -n testacc "TESTARGS=..."`).

Workflow Clarity

This is a simple single-action skill where the action is unambiguous, and it still includes an explicit validation checkpoint ('Check the result with `make -n testacc`') plus the warning that 'A pattern checked with `go test` directly does not prove that it works through `make`'. No destructive or batch operations, so no validation cap applies.

Progressive Disclosure

Under 50 lines, single-file skill with no bundle files (no references/, scripts/, or assets/ exist), organized into clearly labeled Trigger/Fix/Why sections. Per the simple-skill guideline, well-organized sections with no need for external references merit a 5.

Specificity

'Double each `$` for make' names the exact fix and the domain is bounded by concrete artifacts (`make testacc`, `TESTARGS`, the log signature), but only a single fix action is listed rather than the multiple actions of the top anchor. It sits between anchors 3 and 5, noticeably above the midpoint.

Completeness

Explicitly answers both halves: 'Use when a CI acceptance job running `make testacc` fails with... Unterminated quoted string', or a -run pattern ending in `$` passes through TESTARGS' (when, with concrete trigger phrases) and 'Double each `$` for make' (what). Matches the top anchor's requirement of concrete trigger phrases for both.

Trigger Term Quality

'make testacc', 'TESTARGS', and the verbatim error 'Syntax error: Unterminated quoted string' mirror exactly what a user would see and paste, plus '-run pattern ending in `$`'. A few natural variations are missing (other make targets, 'unterminated string' alone, other shells), so it does not reach comprehensive synonym coverage.

Distinctiveness Conflict Risk

The conjunction of the exact shell error string with make/TESTARGS/`$` forms a clear niche with distinct triggers; virtually no other skill would match this description, so conflict risk is minimal.