Conciseness

The body is dense, directive, and assumes competence — every bullet states a rule, path, or command with no concept explanations. It falls just short of anchor 5 because sections 6 and 7 overlap on feedback handling and some phrasing ('represent shared capability, not Sessions-specific policy') could be tightened. It is well above anchor 3 since there is no padding or over-explanation.

Actionability

Guidance is concrete and executable: exact file paths ('browser/menus.ts', 'sessions.*.main.ts'), a runnable command ('npm run valid-layers-check'), named contracts ('ISessionsManagementService', 'ISession', 'IChat'), and a routing table of specifications. It is not a 5 because a few directives remain vague ('invoke the applicable accessibility... skill') and no example of applying the principles is given; it clearly exceeds anchor 3 since no pseudocode or hand-waving fills the gaps.

Workflow Clarity

The seven numbered sections give a clear sequence — principles, identify owning area, inspect, implement, validate proportionally, record feedback, maintain — with an explicit validation step naming the smallest checks to run. It misses anchor 5 because there is no error-recovery loop (what to do when 'valid-layers-check' or tests fail), and it is above anchor 3 because validation checkpoints are explicit and concrete rather than implicit.

Progressive Disclosure

The body is itself a router: a start point ('src/vs/sessions/README.md'), a table mapping each concern to exactly one one-level-deep specification file, a search-before-read rule for the learning inbox, and per-section pointers to specialist skills. No bundle files exist alongside the skill, so structure is judged on the body itself, which matches 'Clear overview with well-signaled one-level-deep references; easy navigation'.

Specificity

The description names the domain ('changes to the Agents Window under src/vs/sessions') but the capabilities are abstract — 'Core principles and workflow router' names roles rather than concrete actions like extracting, analyzing, or reviewing. It matches the anchor 'Names the domain but actions are minimal or generic'; it is not a 3 because no concrete, verb-driven action is stated.

Completeness

It explicitly answers 'when' ('for changes to the Agents Window under src/vs/sessions') and states a 'what' ('Core principles and workflow router'), so it avoids the missing-trigger cap of 3. It is not a 5 because the 'what' is abstract rather than concrete capabilities, and not a 3 because the when-clause is explicit, not weakly implied.

Trigger Term Quality

'Agents Window', 'src/vs/sessions', and 'changes' are natural terms a developer would say, but common variations and synonyms are missing (e.g. 'sessions', 'session list', 'Sessions sidebar'). It matches 'Some relevant keywords but missing common variations or synonyms'; not a 4 because keyword coverage is thin and not a 2 because the keywords are domain-natural rather than generic.

Distinctiveness Conflict Risk

The path-scoped trigger ('src/vs/sessions', 'Agents Window') carves out a clear niche with minimal overlap risk against other skills — a user naming this area would reliably hit this skill. It matches the anchor 'Clear niche with distinct triggers; minimal conflict risk'.