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Mcp Tool Schema

Category: Security  ·  Sub-category: security-misc  ·  Last updated:
ai:mcp
Writes the MCP tool definition for one API operation - name, description, inputSchema and annotations - as the JSON a server returns from tools/list. The schema takes exactly the parameters the operation takes - required ones listed, defaults stated, exact enums, integer amounts, date formats, ranges, string and array limits, either-or parameters that refuse a call with both or neither - and refuses unknown ones. Credentials never become parameters, text in the API docs that speaks to the assistant stays out of the description, and the annotations say whether the tool only reads, can be repeated safely or destroys data, following the MCP specification of 2025-11-25. Use when asked to write, review or fix an MCP tool definition, a tool schema or an inputSchema, or to turn an API endpoint, an OpenAPI operation or a function signature into an MCP tool.
Security AStatic scan found no risk patternsHow grading works ›

From the source SKILL.md

You get one operation: an endpoint from API documentation, an OpenAPI fragment, a function signature, or a few sentences. You write the definition an MCP server returns for it in tools/list. A model reads it to decide when and how to call the tool, and the server checks each call against the inputSchema. A schema that accepts a wrong call lets the model guess and the API fail later; one that refuses a right call makes the tool useless.

What this skill does

Mcp Tool Schema is a community-contributed Claude Code skill in the security-misc sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/mcp-tool-schema/ and loads when your prompt matches the skill's trigger.

When to invoke it: Use when asked to write, review or fix an MCP tool definition, a tool schema or an inputSchema, or to turn an API endpoint, an OpenAPI operation or a function signature into an MCP tool.

Who uses this skill

The Mcp Tool Schema Claude Code skill is built for security engineers, penetration testers, DevSecOps practitioners, and development teams hardening codebases and infrastructure. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 213,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).

How to install

Free

Manual install (2 steps)

mkdir -p ~/.claude/skills/mcp-tool-schema
curl -L https://claudskills.com/skills/mcp-tool-schema/SKILL.md \
  -o ~/.claude/skills/mcp-tool-schema/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/mcp-tool-schema/. Claude Code auto-discovers it on next session.

Skills live at ~/.claude/skills/mcp-tool-schema/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\mcp-tool-schema\SKILL.md on Windows. See the full install guide for step-by-step instructions.

Telegram

📱 Install from your phone or desktop Telegram

Open @claudskills_bot on Telegram, tap Open Desktop App, and the desktop app installs this skill for you. Or share the bot link with a colleague — they get the same one-tap install. Learn more →

Pro

One-click install via the desktop app

The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.

Pro

For the full experience including quality scoring and one-click install features for each skill — upgrade to Pro.

See pricing → Download desktop app

Frequently asked questions

How do I install the Mcp Tool Schema Claude Code skill?
Install via the ClaudSkills desktop app (one click) or copy SKILL.md from the source repository to ~/.claude/skills/mcp-tool-schema/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.
What does the Mcp Tool Schema skill do?
Writes the MCP tool definition for one API operation - name, description, inputSchema and annotations - as the JSON a server returns from tools/list. The schema takes exactly the parameters the operation takes - required ones listed, defaults stated, exact enums, integer amounts, date formats, ranges, string and array limits, either-or parameters that refuse a call with both or neither - and refuses unknown ones. Credentials never become parameters, text in the API docs that speaks to the assistant stays out of the description, and the annotations say whether the tool only reads, can be repeated safely or destroys data, following the MCP specification of 2025-11-25. Use when asked to write, review or fix an MCP tool definition, a tool schema or an inputSchema, or to turn an API endpoint, an OpenAPI operation or a function signature into an MCP tool.
Is this skill free to install?
Yes. ClaudSkills is an open registry — every skill keeps its source repository's license, and manual install via copy is free. ClaudSkills Pro ($9/mo, $79/yr, or $149 one-time) adds one-click install via the desktop app and a multi-signal Quality Score.
When should I use the Mcp Tool Schema skill?
Use Mcp Tool Schema when your Claude Code task falls under the Security category — specifically in the security misc area. Claude Code auto-discovers installed skills and invokes the right one based on the task description, so you can also ask Claude directly (e.g. "use Mcp Tool Schema" or describe the task and let Claude pick). Browse related skills at /category/security/.
What is a Claude Code skill and how does the Mcp Tool Schema skill fit in?
A Claude Code skill is a SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Mcp Tool Schema is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Security category. Learn more at /learn/what-is-a-claude-skill/.

Attribution & license

Cite this skill

If you reference this skill in a blog post, paper, or documentation, you can cite it as:

APA
paranormalen2. (2026). Mcp Tool Schema [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/mcp-tool-schema/
BibTeX
@misc{mcp-tool-schema-2026,
  author    = {paranormalen2},
  title     = {Mcp Tool Schema [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/mcp-tool-schema/}
}

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Security scan

Grade A · scanned 2026-11-01 — free static scan against the OWASP Agentic Skills Top 10.

No risk patterns were found in any of the ten OWASP-aligned categories. How grading works ›

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More Security skills

Browse all Security skills in the ClaudSkills registry, or explore these other picks from the same category:

Browse all Security skills → Top 100 skills
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