Conciseness

The body is lean and project-specific throughout: exact commands (`make start`, `pnpm dev:local-temporal`, `go build -o ui-server ./cmd/server`), ports (`7233`, `7243`), the `.env.local-temporal` mechanism, and the non-obvious "unknown field" gotcha. Nothing explains concepts Claude already knows; the grpc-gateway paragraph is essential project-specific knowledge that justifies the sync steps. Matches anchor 5 ("every token earns its place"); anchor 4 would require over-explanation that could be trimmed, and none is evident.

Actionability

Every step is a copy-paste-ready command: `make start`, `git checkout <branch-name>` / `make bins`, `pnpm dev:local-temporal`, `grep "go.temporal.io/api" ~/code/temporal/go.mod`, `go get go.temporal.io/api@<version>`, and the build command. The placeholders (<branch-name>, <version>) are appropriate parameterization, not pseudocode. Matches anchor 5 ("fully executable; copy-paste ready; covers the common cases").

Workflow Clarity

The two-terminal structure is clearly sequenced (server first, then UI), and the ui-server sync is a numbered 4-step list with rationale. Helpful anti-error notes exist ("make bins # safe to run even if already built"). Not 5 because there are no explicit validation checkpoints (e.g., verifying the server is listening on 7233/7243 before starting the UI); not 3 because the sequence is fully coherent with no gaps and the failure mode ("unknown field" rejection) is anticipated.

Progressive Disclosure

No bundle files exist (references/, scripts/, assets/ are absent), and the skill is a single self-contained flow of ~65 lines that needs no external references — all sections (Terminal 1, Terminal 2, why-not-dev, ui-server sync) are short, well-headed, and appropriately inline. Per the rubric's simple-skill guidance, well-organized sections with no need for external files warrant a 5; nothing here clearly belongs in a separate file.

Specificity

"Instructions for running the UI against a local Temporal server build instead of the built-in CLI dev server" names the domain and one core action, but does not enumerate the skill's concrete capabilities (starting the Temporal server, running the UI dev server, syncing the ui-server with the server branch). It clearly exceeds anchor 2 ("Processes PDF files"-level domain naming with generic actions) but falls short of anchor 4, which expects several specific listed actions.

Completeness

Explicitly answers both questions: the "what" ("running the UI against a local Temporal server build instead of the built-in CLI dev server") and the "when" ("Use when asked how to start the dev environment, run the UI locally, or connect to a local Temporal repo") with concrete trigger phrases. Matches anchor 5 directly; anchor 4 would require the "when" clause to be less explicit or specific, which it is not.

Trigger Term Quality

"Use when asked how to start the dev environment, run the UI locally, or connect to a local Temporal repo" gives three natural phrases a user would plausibly say. Not 5 because common variations are missing — e.g., "dev server", "local development", "temporal server" itself; not 3 because the triggers go beyond a single generic keyword and include the distinctive "local Temporal repo" phrasing.

Distinctiveness Conflict Risk

The local-Temporal-vs-CLI-dev-server distinction carves a clear niche, and "connect to a local Temporal repo" is a distinct trigger. Minor overlap risk remains: "start the dev environment" and "run the UI locally" could also match a generic run-the-app skill, so it is not the minimal-conflict anchor 5; it is clearly more distinct than anchor 3's overlap-prone phrasing.