Conciseness

Nearly every sentence carries non-obvious operational facts (durable directories, profile paths, env vars, the extension-ID-change warning, the --enable-blink-features anti-pattern) with no padding of concepts Claude already knows. It falls at "efficient; minor instances ... that could be trimmed" rather than 5 because the time-sensitive version string "Chrome 157.0.8080.0 or newer" is repeated three times instead of stated once.

Actionability

Everything is executable: the exact script invocation with arguments (".agents/skills/canvas-capture-extension/scripts/rebuild-extension.sh --repo <remotion-checkout>"), absolute install paths, the dev command "bun run dev", exact env vars with example values (CANVAS_CAPTURE_HANDOFF_ORIGIN, CANVAS_CAPTURE_BROWSER_EXECUTABLE), chrome:// URLs, flag names, and the files to confirm. Copy-paste ready commands cover the common cases, matching the top anchor.

Workflow Clarity

Each workflow is clearly sequenced with numbered steps, an explicit post-build validation checkpoint ("Confirm that the installed directory contains manifest.json, background.js, ..."), and conditional recovery branches in the reload section ("If Remotion Canvas Capture already points to the durable directory, click Reload" / "If Chrome shows the deleted worktree path, remove that broken entry..."). It stops short of 5 because there is no checkpoint verifying the extension actually loaded cleanly (e.g., no errors on chrome://extensions) after Load unpacked/Reload.

Progressive Disclosure

The body is a well-sectioned overview that delegates the entire build logic to the real one-level-deep bundle script scripts/rebuild-extension.sh (verified to exist and to match the documented behavior), and inlines nothing that belongs in a separate file. Navigation via the four section headers is easy, matching the anchor "clear overview with well-signaled one-level-deep references; content appropriately split; easy navigation".

Specificity

"Rebuild, install, and reload the private Remotion Canvas Capture unpacked Chrome extension" names a specific artifact with three concrete verbs, and the when-clause adds "restored after a Codex worktree was deleted, rebuilt after source changes, moved to its durable install directory, or reloaded in Chrome or Chrome Canary". This matches the anchor "lists several specific actions; minor gaps in coverage" — the body's dev workflow (bun run dev) and shot preparation are not surfaced in the description, preventing a 5.

Completeness

The "what" is explicit ("Rebuild, install, and reload the ... Chrome extension") and the "when" is explicit with concrete trigger phrases ("Use when the extension needs to be restored after a Codex worktree was deleted, rebuilt after source changes, moved to its durable install directory, or reloaded in Chrome or Chrome Canary"). This clearly matches the anchor "clearly and explicitly answers both what AND when with concrete trigger phrases"; a 4 would require the when-clause to be less specific, which it is not.

Trigger Term Quality

Natural terms users would say are present: "rebuild", "install", "reload", "Chrome", "Chrome Canary", "extension", "worktree was deleted", "source changes". A few natural phrases a user might say are missing (e.g., "load unpacked", "extension not showing"), so it fits the anchor "good keyword coverage; a few natural terms missing" rather than the comprehensive 5.

Distinctiveness Conflict Risk

The skill targets one named private artifact ("Remotion Canvas Capture unpacked Chrome extension") with triggers specific to it (worktree deletion, durable install directory), giving it a clear niche with distinct triggers and minimal conflict risk with other skills.