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docs: document package model experience

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Tianyi Cui
2026-07-12 02:12:36 +08:00
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packages/skill/tool-skill/README.md
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@@ -4,6 +4,13 @@ The model-facing skill catalog and `skill` tool.
Requires `ctx.tools` and `ctx.skills` (`inject: ['tools', 'skills']`).
## Model Experience
| Context surface | What the model sees | Token effect |
|---|---|---|
| Session prefix | If model-invocable skills exist and this exact `skill` tool is visible, the agent receives one user-role `<system-reminder>` listing sorted names and capped descriptions. The composed catalog is frozen for the loop instance and prepended to every request, outside ordinary history. | Repeated input cost scales with skill count and `catalogDescriptionMaxLength`; no catalog tokens are sent when the list is empty or the tool is hidden or shadowed. |
| Tool schema and result | The model sees the fixed `skill(name)` schema. A successful call returns the selected full instructions plus resource-resolution guidance; no duplicate `agent.inject()` copy is made. | Fixed schema cost per request. Loaded instructions are data-dependent tool-result tokens, resent on later steps until compaction. |
## Session-prefix catalog
The plugin contributes one user-role `<system-reminder>` catalog through `agent/session-prefix`. It resolves skills for the calling session's cwd, forwards the prefix abort signal to discovery, and lists only sorted `name` and `description` entries; skill bodies, paths, sources, providers, and `whenToUse` hints remain outside the catalog. The catalog is omitted when no model-invocable skills are available, and also when that agent's tool view restricts away the shipped `skill` tool or resolves a same-name scoped shadow instead. This exact-definition check keeps prompt guidance, the model-visible schema, and executable dispatch aligned.