Conciseness

The body is lean imperative guidance with no explanations of concepts Claude already knows; every line is directive, and the only near-redundancy (terminal-call protocol) is duplicated between body and output.md for enforcement, not padding.

Actionability

Guidance is fully executable for an instruction-only skill: exact paths to read (.factory/CONTEXT.md, FACTORY.json validation.work.commands), a numbered TDD loop with fail-for-the-expected-reason confirmation, and an exact output template in references/output.md.

Workflow Clarity

The contract → design → proving slices → finish → output sequence is explicit, with validation checkpoints (confirm the failing test's reason, prove the real artifact, focused-then-broad checks) and feedback loops (stop and redesign when the sketch fights, plan-conflict escalation path).

Progressive Disclosure

The body holds only orchestration; both referenced files (references/playbooks.md, references/output.md) exist, are clearly signaled with markdown links, and are one level deep — an easy-to-navigate overview plus detail split.

Specificity

The description lists multiple concrete actions in third person — 'Implement one dependency-ready ticket task in an isolated worktree using a small design sketch, behavior-first tests, the appropriate task playbook, and bounded verification' — covering the workflow comprehensively rather than with minor gaps.

Completeness

It explicitly answers both what (the full implement/sketch/tests/playbook/verification action list) and when ('Use for the work stage after ticket planning') with a concrete trigger phrase, matching the top anchor.

Trigger Term Quality

Natural keywords like 'ticket task', 'worktree', 'tests', and 'work stage after ticket planning' are present, but common variations a user might say ('implement', 'build the task', 'TDD') are missing, fitting the good-but-incomplete keyword coverage anchor.

Distinctiveness Conflict Risk

The trigger is scoped to a specific pipeline stage with distinct terms ('dependency-ready ticket task', 'isolated worktree'), but 'bounded verification' and worktree language overlap the territory of closely related sibling skills such as prove-it-works, giving minor overlap risk.