Conciseness

The ~800-line body is information-dense with codebase-specific knowledge Claude would not know, but it duplicates material: the External trait is sketched once in 'Core Concepts' and again in Step 3, the update+get pattern is explained in at least four places, and self-evident comments like '// <-- Add this' pad the code blocks. This matches 'mostly efficient but could be tightened' rather than the minor-trim level of 4.

Actionability

Guidance is largely executable: full SQL migration text, a near-complete external.rs implementation, exact file paths for all 18 steps, and concrete commands like `cargo check -p windmill-native-triggers --features native_trigger` and `npm run generate-backend-client`. Minor gaps — the abbreviated trait signatures in Core Concepts, the `todo!()` in list_all(), and terse steps like 'Add to NATIVE_TRIGGER_SERVICES' without a code example — keep it below fully copy-paste-ready.

Workflow Clarity

Eighteen explicitly numbered steps in a logical order (DB migration → common enums → backend → registry → frontend → OpenAPI/types), capped by a testing checklist with concrete verification commands. The sequence is clear, but validation is end-loaded in the checklist rather than checkpointed per step with fix-and-retry feedback loops, matching 'most checkpoints present; minor validation gaps' rather than the 5 anchor's explicit feedback loops.

Progressive Disclosure

No bundle files exist (no references/, scripts/, or assets/), so all ~800 lines live inline in SKILL.md with good section headers and tables but no offloading. Content that clearly belongs in separate files — the full external.rs template, the Google/Nextcloud pattern deep-dives, and the ServiceName method tables — is inlined, matching 'some structure but content that should be separate is inline'. Codebase pointers like 'See backend/windmill-native-triggers/src/google/' partially signal where detail lives, but there are no one-level-deep reference files.

Specificity

"Guidance for adding native trigger services to Windmill" names the domain clearly and implies one concrete action (adding services), but does not enumerate several specific concrete actions (e.g., implementing the External trait, adding migrations, wiring frontend forms). It sits at the 'domain plus 1-2 concrete actions, not comprehensive' anchor, below 4 which requires several listed specific actions.

Completeness

Both parts are present: the what is "Guidance for adding native trigger services to Windmill" and the when is the explicit "Use when implementing or modifying native trigger integrations across the backend and frontend". The when clause restates the what rather than adding concrete trigger phrases, matching the 'both present but when could be more specific' anchor rather than the 5 anchor's concrete trigger phrases.

Trigger Term Quality

Terms like "native trigger", "Windmill", "trigger integrations", "implementing or modifying", and "backend and frontend" give good keyword coverage for what a contributor would say ("add a native trigger service", "modify trigger integrations"). A few natural variations are missing — e.g., webhooks, push notifications, or named services like Nextcloud/Google — keeping it below the comprehensive 5 anchor.

Distinctiveness Conflict Risk

"Windmill" and "native trigger services" carve out a clear niche with distinct trigger terms; no plausible competing skill would match this description, fitting the 'clear niche with distinct triggers; minimal conflict risk' anchor.