tool-design SKILL.md skillA
tool-design from mjunaidca/mjs-agent-skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add mjunaidca/mjs-agent-skills/tool-design@git:20251222.04068a4Pins git:20251222.04068a4 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- mjunaidca/mjs-agent-skills
- Path
.claude/skills/tool-design/SKILL.md- Versions recorded
- 1
- Latest version
- git:20251222.04068a4, committed Dec 22, 2025
- Size
- 12,584 bytes
- Repository stars
- 28
- License
- none declared
Design tools that agents can use effectively. Use when creating new tools for agents, debugging tool-related failures, or optimizing existing tool sets.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Tool Design for Agents Tools are the primary mechanism through which agents interact with the world. They define the contract between deterministic systems and non-deterministic agents. Unlike traditional software APIs designed for developers, tool APIs must be designed for language models that reason about intent, infer parameter values, and generate calls from natural language requests. Poor tool design creates failure modes that no amount of prompt engineering can fix. Effective tool design follows specific principles that account for how agents perceive and use tools. ## When to Activate Activate this skill when: - Creating new tools for agent systems - Debugging tool-related failures or misuse - Optimizing existing tool sets for better agent performance - Designing tool APIs from scratch - Evaluating third-party tools for agent integration - Standardizing tool conventions across a codebase ## Core Concepts …
Read the whole file at its exact version.
How to install
mdr add mjunaidca/mjs-agent-skills/tool-design@sha256:5f6422ff0397b8a1The line at the top of this page pins the label git:20251222.04068a4, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_zofwwllpfvdd6kv3)
4 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on Dec 22, 2025.
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (12584 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
mjunaidca/mjs-agent-skills · 28 stars · license none declared · pushed 2026-08-12 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_zofwwllpfvdd6kv3 GET https://markdownregistry.com/api/v1/resolve?ref=mjunaidca/mjs-agent-skills/tool-design GET https://markdownregistry.com/api/v1/blob/5f6422ff0397b8a1b9eb9091c56db090a9d081d6f416fd1732f8d9fe09f07cff
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.
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