Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add skyfox675/agents-skills --skill mcp-buildergit clone --depth 1 https://github.com/skyfox675/agents-skillsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/skyfox675/agents-skills/mcp-builder)<a href="https://agentmods.dev/skills/skyfox675/agents-skills/mcp-builder"><img src="https://agentmods.dev/badge/skills/skyfox675/agents-skills/mcp-builder/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/skyfox675/agents-skills/mcp-builder"><img src="https://agentmods.dev/badge/skills/skyfox675/agents-skills/mcp-builder.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00061 | $0.00373 |
| Opus 5 | $0.00030 | $0.00187 |
| Sonnet 5 | $0.00012 | $0.00075 |
| Haiku 4.5 | $0.00006 | $0.00037 |
Grade B, and why
mcp-builder scanned grade B with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 6d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Enumerates other installed skillsmediumAgent snooping
Other skills' SKILL.md files reveal prompts, capabilities and secrets that should be invisible to peers.
- **Cursor / GitHub Copilot:** copy `skills/mcp-builder/` from anthropics/skills into your skills dir (`.cursor/skills/`, `.github/skills/`, or the shared `.claude/skills/`). What it actually says
mcp-builder (pointer skill)
Pointer skill — the implementation is not stored here. The name above is the stable local contract; the body lives upstream and is fetched/installed from source so consumers always get the latest version.
- Canonical source: https://github.com/anthropics/skills/blob/main/skills/mcp-builder/SKILL.md
- Raw SKILL.md: https://raw.githubusercontent.com/anthropics/skills/main/skills/mcp-builder/SKILL.md
- What it does: A structured four-phase process for building MCP servers that integrate external APIs/services, in Python (FastMCP) or Node/TypeScript (MCP SDK).
- License: see the anthropics/skills repo LICENSE.
Installing this skill
- Claude Code (recommended):
/plugin marketplace add anthropics/skills, then/plugin install example-skills@anthropic-agent-skills— this skill ships in the example-skills plugin. - Claude.ai (paid plans): already available, no install.
- Claude API: upload/enable via the Skills API.
- Cursor / GitHub Copilot: copy
skills/mcp-builder/from anthropics/skills into your skills dir (.cursor/skills/,.github/skills/, or the shared.claude/skills/).
Do not copy the upstream body into this file; that would freeze the version and defeat the pointer.
What ships with it
1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 6d ago First seen · 23 lines · 61 tokens per session scan B 778e9bc498d9
mcp-builder is a skill published in the GitHub repository skyfox675/agents-skills (10 stars, last pushed 9d ago), licensed MIT. It adds 61 tokens to every session and 373 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it B with 1 finding (enumerates other installed skills). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.
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