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Debug WebSocket connection issues between CLI and FigJam plugin.
Passed 19 of 22 test cases with the skill, and 6 of 22 without it.
and 15 more in the full report
13 fixed6 passed either way3 still failing0 broke
Tokens, turns and time describe resource use, not a dollar price.
One of 13 test cases the skill fixed. Same model, same prompt, with and without the skill.
When constructing the initial handshake message frame from the plugin UI to the server, which authentication field is optionally included alongside the document identifier?
| Checked | Without skill | With skill |
|---|---|---|
| Identifies 'secret' as the optional key in the handshake payload | Missed | Passed |
The instructions your model reads when the skill loads.
CLI serve (Bun) ←── WebSocket ──→ Plugin UI (ui.ts) ←── postMessage ──→ Plugin Main (code.ts)
│ │ │
File watcher Browser APIs Figma API
YAML parsing WebSocket client Canvas rendering
| Issue | Symptom | Solution |
|---|---|---|
| CLI not running | "Connecting..." indefinitely | Start bun run packages/cli/src/index.ts serve diagram.yaml |
| Port in use | Connection refused | Check lsof -i :3456, use different port |
| Secret mismatch | Connects then immediately closes | Match --secret value in CLI and plugin |
| YAML errors | Connected but no updates | Fix validation errors in CLI output |
| docId mismatch | No response after hello | Ensure plugin docId matches YAML docId |
| Patches not applied | Connected, canvas unchanged | Check Plugin Main console for render errors |
bun run packages/cli/src/index.ts build diagram.yamlPlugin CLI
│ │
│──── hello ─────────────────►│ {type:"hello", docId, secret?}
│◄──── full ─────────────────│ {type:"full", rev, ir}
│ │
│ [YAML changes] │
│◄──── patch ────────────────│ {type:"patch", baseRev, nextRev, ops}
│ │
│ [Reconnect] │
test cases passed, vs 6 / 22 without
More skills from the same source and nearby in the registry, with their headline benchmark lift.