Conciseness

The ~40-line body contains only project-specific knowledge Claude cannot infer: paths ("/home/igor/SNB/snb-worktime-webui", "internal/web/static"), architecture constraints, category names ("worked, confirmed, unconfirmed, idle, disconnected, unknown"), and exact build commands. No padding and no explanation of concepts Claude already knows; every token earns its place, matching the 5 anchor.

Actionability

Guidance is concrete and copy-paste ready: "go test ./..." and "GOOS=windows GOARCH=amd64 go build -o dist/snb-worktime-webui.exe ./cmd/snb-worktime-webui", plus specific packages ("internal/worktime") and file locations. Per the rubric's instruction-only-skill note, the absence of code samples is not penalized because the guidance is directly actionable; matches the 5 anchor.

Workflow Clarity

A clear 5-step sequence exists with an explicit validation gate ("Before finishing, run: go test ./... [and the] GOOS=windows ... go build"), and tests are required for parser/calculation changes. It is 4 rather than 5 because there is no explicit error-recovery feedback loop (e.g., what to do when tests or the build fail), and the read-README/confirm-map steps lack checkpoints.

Progressive Disclosure

The body is a lean overview with well-organized sections (Overview, Workflow, Project Rules, Typical Tasks, References) and a single clearly-signaled, one-level-deep reference: "Read references/project-map.md before substantial changes", repeated in the References section. The referenced file exists and itself contains no nested references, matching the 5 anchor.

Specificity

The description states a concrete capability ("a Go application with an embedded web UI for calculating employee worktime from Windows session snapshots and workstation or network activity windows") and lists multiple specific actions: "adding features, fixing bugs, adjusting parsing rules, changing calculation logic, refining the web UI, updating Windows build flow, or integrating new telemetry sources". This matches the 5 anchor (multiple specific concrete actions, comprehensive coverage) rather than 4, since the action list covers all major subsystems of the project; only the generic verbs "adding features, fixing bugs" keep it from being perfectly precise.

Completeness

It explicitly answers both questions: what it does (Go application with embedded web UI computing employee worktime from session snapshots and activity windows) and when to use it via a concrete "Use when adding features, fixing bugs, adjusting parsing rules..." clause. This is the 5 anchor — clear what AND when with concrete trigger phrases; the explicit 'Use when' clause also avoids the 3-cap.

Trigger Term Quality

Natural trigger terms are present: "snb-worktime-webui", "parsing rules", "calculation logic", "web UI", "Windows build", "telemetry sources", "session snapshots", "activity windows" — phrases a user of this project would naturally say. It sits at 4 rather than 5 because a few natural synonyms are missing (e.g., "work time", "hours", "attendance", "collector"), though for a project-scoped skill the repo name is the dominant trigger.

Distinctiveness Conflict Risk

It names the exact project ("snb-worktime-webui"), the repository ("SNB"), and project-specific subsystems (Windows session snapshots, Windows build flow), ending with "for this specific project". Minimal conflict risk with any other skill; matches the 5 anchor (clear niche with distinct triggers).