Individual skill
tool-design
Design or audit the tools an AI agent calls (MCP server tools, function calling, Runtype runtime and saved tools), or find out why an agent picks the wrong tool or misuses one. Routes naming, schema, output, error, execution, and security work to focused guides.
plugins/runtypelabs/skills/skills/tool-design/SKILL.md
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- Last checked
- Nov 4, 2026
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- Nov 6, 2026
- License
- Apache-2.0
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SKILL.mdcore · 21,617 bytesagents/openai.yamlasset · 263 bytesreferences/checklist.mddoc · 9,825 bytesreferences/pattern-index.mddoc · 7,525 bytes
Read excerpt
# Tool Design
A tool that returns correct data can still fail in production because the agent could
not tell when to call it, what to pass, or what to do with the result. "Working" is not
the same as "agent-usable". This skill family treats the agent as the consumer and
designs for it.
The guidance is framework-neutral: it applies to MCP servers, native function calling,
Runtype runtime tools, and any custom loop. It is organized as 54 named patterns across
ten questions; `references/pattern-index.md` maps every pattern to the skill that owns
it.
## The consumer changed, so the design rules changed
