Conciseness

The body is dense operational procedure with no padding or explanation of known concepts, but has minor duplication: the Layer 1 / multi-layer visual validation note appears in both Step 4.4 and Step 5.2, and the agent-model dispatch lookup instructions repeat across Steps 4 and 5. This matches the 'minor instances that could be trimmed' anchor rather than the every-token-earns-its-place anchor.

Actionability

Guidance is copy-paste ready for an instruction-only orchestration skill: exact AskUserQuestion prompts with numbered options, the exact project directory layout to verify, the exact one-line status message to emit, exact PROGRESS_TRACKER.json field updates, and branch-specific test-failure handling prompts. The only deferral (the 'Dispatch convention' fallback) is an explicitly signaled reference.

Workflow Clarity

Six explicitly sequenced steps with validation checkpoints (task existence, blocked dependencies, missing tracker warning) and explicit feedback loops: needs-fixes verdicts drive resume/fresh-dispatch re-execution with a 2-cycle cap and escalation, and test failures branch into user-facing resolution options. This matches the clear-sequence-with-explicit-validation-and-feedback-loops anchor.

Progressive Disclosure

No bundle files exist; the skill is a single well-sectioned ~190-line document with clear headers and clearly signaled cross-references to sibling skills (ensure-config.md, arn-code-save-plan Step 1). However, detailed material that could live in a reference file — executor dispatch context lists, the PROGRESS_TRACKER update procedure, and the multi-branch test-failure handling — is fully inlined, so content is not split as the 5 anchor requires.

Specificity

The description names the domain ('execute a single specific task from the task list with optional review') but only 1-2 user-level actions; it does not enumerate what execution involves (executor dispatch, review gate, progress tracker update), so coverage is not comprehensive as required for 4.

Completeness

Both 'what' (execute one task with optional review) and 'when' (explicit quoted trigger phrases) are clearly and explicitly stated, plus an explicit boundary ('This is for ONE task only... use arn-code-execute-plan instead'). The 4 anchor's caveat that 'when' could be more explicit does not apply.

Trigger Term Quality

Six quoted natural trigger phrases ('execute task N', 'run task N', 'implement task N', 're-run task N', 'retry task N', 'run single task') comprehensively cover synonyms and phrasing variations users would naturally say; no common terms are missing.

Distinctiveness Conflict Risk

An explicit disambiguation sentence against the sibling full-plan skill ('for executing the full plan (all tasks), use arn-code-execute-plan instead') plus task-specific triggers ('execute task N', 'retry task N') give it a clear niche with minimal conflict risk.