The body is lean: a one-sentence cross-platform framing of symbolication followed by a tight build→artifact→symbol-set→frame pipeline, with no padded library background or restatement of generic concepts. Every section earns its place.

Provides fully executable commands (the Vite config block, `posthog-cli symbol-sets extract` with npx/bunx variants), exact MCP tool names with parameters, and a verified helper script, plus concrete field-interpretation guidance.

A clear 5-step sequenced workflow with explicit validation checkpoints (fix the build before debugging the upload; download immediately; compare local/uploaded/served), a feedback loop, and a cross-platform failure-matrix checklist.

The SKILL.md is a well-signaled overview that points one level deep to a verified `references/javascript.md` and `scripts/inspect_sourcemaps.py`, with platform detail appropriately split out and honest "_coming soon_" placeholders; navigation via the Platforms table and inline callouts is easy.

Names the precise domain (PostHog Error Tracking symbolication across four specific platforms) and lists several concrete diagnostic actions and failure signals rather than vague verbs. It is comprehensive rather than naming only some actions, so it clears the top anchor.

Clearly states what it does (debug symbolication) and provides an explicit "Use when..." clause enumerating multiple trigger conditions, answering both what and when.

Uses terms a developer hitting this problem would actually say — "stack frames stay minified or obfuscated", "Token not found", "source maps", "dSYMs", "Proguard mappings", "chunk IDs", "symbol-upload" — giving good natural-language coverage.

The niche — PostHog Error Tracking symbolication for four named platforms — is narrow and tied to distinctive triggers, making conflict with other skills unlikely.