Conciseness

The body is dominated by tight code blocks, tables, and one-line directives; only minor known-concept padding exists ("A deadlock = a cycle in the lock-wait graph: thread A holds X waiting for Y; thread B holds Y waiting for X" restates what Claude already knows). Fits anchor 4 (efficient, minor trimmable instances) better than anchor 3, since the padding is a single sentence rather than a section.

Actionability

Mostly executable: OrderedLock, build_lock_graph, find_cycles, TSAN_OPTIONS command, and the jstack/gdb/SIGQUIT table are copy-paste ready. Minor gaps keep it below anchor 5 — Step 5 omits `import time` and its holder-forever example will always fail the assert, Step 8's `fingerprint_acquire` is never actually called by `run_workload()`, and Step 2 is self-labeled a "rough sketch" (an explicit justification, so not penalized as pseudocode).

Workflow Clarity

Steps 1–8 are clearly sequenced with named headers, and validation is embedded via assertion-based tests ("test_no_lock_cycles_in_workload", "test_lock_acquired_within_timeout") plus an anti-patterns table with fixes. It falls short of anchor 5 because there is no explicit validate→fix→re-run feedback loop, and the workflow does not need the destructive/batch cap since its operations are test/diagnostic rather than destructive.

Progressive Disclosure

A single-file skill (no references/, scripts/, or assets/ exist to verify) that is well-organized into clearly headed sections, an anti-patterns table, limitations, and a one-level References section with a real TSan link. It matches anchor 4: good structure, but all eight steps' full implementations are inlined (~230 lines) where the reusable harness code (Steps 2–5) could live in scripts/; not anchor 3 since nothing is buried or misfiled.

Specificity

The description lists four concrete, distinct capabilities — "Records lock order, finds cycles, uses lock timeouts to fail instead of hang, and reads jstack or gdb thread dumps" — with no vague filler. Coverage is comprehensive for the deadlock-detection domain, matching the top anchor; it is not score 4 because there are no meaningful gaps in the action list.

Completeness

Both halves are explicit: "Use when a service that takes two or more locks hangs in production with no error, or before a release when lock order across code paths was never checked" answers when with concrete triggers, and the capability sentence answers what. Matches the anchor-5 example structure; not score 4 because the 'when' clause is already fully explicit and specific.

Trigger Term Quality

Natural phrases users would say are present — "hangs in production with no error", "lock order", "thread dumps", "jstack or gdb" — but the description never uses the word "deadlock" itself or common synonyms like "frozen"/"stuck". This is good coverage with a few natural terms missing (anchor 4), clearly above anchor 3 since several genuinely natural trigger phrases are included.

Distinctiveness Conflict Risk

A clear niche — multi-lock services, hang diagnosis, lock-order checking, jstack/gdb dumps — with triggers unlikely to fire for adjacent skills (e.g., data-race detection). Distinct, domain-specific vocabulary gives minimal conflict risk, matching anchor 5 rather than anchor 4's 'minor overlap risk with closely related skills'.