Conciseness

The body is dense with project-specific wiring (e.g., "createHmacVerifier passes requireSecret: true when the provider always signs", "no code touches route.ts, provider-subscriptions.ts, or deploy.ts") and never explains concepts Claude already knows. Minor over-explanation exists: the final checklist restates rules already given per-section, and the outputs schema is demonstrated twice (Step 1's build{Service}Outputs and the later 'Trigger Outputs Schema' section), keeping it just below level 5.

Actionability

Concrete executable TypeScript templates with exact paths ("apps/sim/lib/webhooks/providers/{service}.ts") and runnable checks ("bun run type-check", "bun run check:cron-parity") cover the common cases. It is not level 5 because the secondary trigger example is elided as "Same as above but: id: '{service}_event_b', no includeDropdown" and the polling handler contains placeholder pseudocode ("// Fetch changes since last poll, process with idempotency // ..."), though real reference implementations (rss, gmail, google-drive) are pointed to.

Workflow Clarity

A clear four-step task sequence is elaborated in ordered sections (Step 1 utils, Step 2 triggers, Step 3 register and wire), with explicit validation checkpoints ("bun run type-check passes", "Always verify by checking the output after running the script"), feedback loops (throw from createSubscription so "orchestration rolls back the DB webhook"), error-recovery guidance for unknown payloads, and a comprehensive final checklist. This matches the anchor for clear sequence with explicit validation, feedback loops, and a checklist.

Progressive Disclosure

No references/, scripts/, or assets/ bundle exists, so the entire ~550-line body — full webhook and polling tracks, complete handler templates, and checklists — is inlined in SKILL.md. Section headers are clear and pointers to real repo files ("apps/sim/lib/webhooks/polling/rss.ts", the add-block and add-selector skills) are well signaled, but content that clearly belongs in one-level-deep reference files (e.g., a dedicated polling reference) is inline, matching anchor 3 rather than 4.

Specificity

"Create webhook or polling triggers for a Sim integration" names the domain ("Sim integration") and two concrete actions ("webhook or polling triggers"), but coverage stops there — no mention of registration, provider handlers, or block wiring, matching the anchor for 1-2 concrete actions without comprehensiveness. It is not level 4 because 'several specific actions' would require enumerating more of the workflow it actually covers.

Completeness

The 'what' is clear ("Create webhook or polling triggers for a Sim integration") but there is no 'Use when...' clause or equivalent explicit trigger guidance, which per the judging guidelines caps completeness at 3. It is not level 2 because the 'what' is specific rather than vague.

Trigger Term Quality

"webhook", "polling", "triggers", and "integration" are natural terms users would say when needing this skill (e.g., 'add a webhook trigger to the Linear integration'). It falls short of level 5 because common variations like "event", "notification", or "add trigger" phrasing are absent.

Distinctiveness Conflict Risk

The niche ("webhook or polling triggers for a Sim integration") is well delimited and unlikely to fire for unrelated skills; only minor overlap risk exists with closely related Sim integration skills like add-block or add-selector. Not level 5 because the description itself gives no distinguishing trigger phrases beyond the domain name.