letta-ai/letta-code · src/skills/builtin/using-mcp-tools/SKILL.md

using-mcp-tools skillA

using-mcp-tools is agent-read markdown (skill) from letta-ai/letta-code: Reference for the `letta mcp` CLI, which finds and invokes MCP tools available to this agent. A system reminder already lists your connected MCP servers and the basic search/schema/call commands; invoke this skill when you need more — browsing a server's tools, passing large or file-based arguments, tuning search, or troubleshooting missing servers, tools, and errors..

Indexed from public GitHub and served as immutable, content-addressed versions. Install it pinned to an exact SHA-256 with the mdr CLI, and every file is verified against the hash recorded here before it reaches your agent. The deterministic audit below grades the latest version, and the same file always earns the same grade.

How to install

Latest version
mdr add letta-ai/letta-code/using-mcp-tools@git:20260901.ba6cfe4
Exact content
mdr add letta-ai/letta-code/using-mcp-tools@sha256:31f2083652c10a52

Pin to a label to follow the author's releases, or to a sha256 to freeze the exact bytes forever. Either way the resolved hash is written to mdr.lock, and mdr install reproduces it on any machine.

Badge

mdr badge

[![mdr](https://markdownregistry.com/badge/art_6osy777li7bzc2ab.svg)](https://markdownregistry.com/a/art_6osy777li7bzc2ab)

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Versions

versioncommittedcommitsizeaudit
git:20260901.ba6cfe4 latest2026-09-01 ba6cfe4 3,585 BA view

Audit of the latest version

A  17 of 17 checks passed. Deterministic, no model, same answer every run.
  • pass: Frontmatter block present
  • pass: Frontmatter declares a name
  • pass: Frontmatter declares a description
  • pass: Size between 200 bytes and 200 KB (3585 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

GitHub

letta-ai/letta-code · 3,370 stars · license Apache-2.0 · pushed 2026-09-18 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_6osy777li7bzc2ab
GET https://markdownregistry.com/api/v1/resolve?ref=letta-ai/letta-code/using-mcp-tools
GET https://markdownregistry.com/api/v1/blob/31f2083652c10a5247d39482fd8a9bad41002e9e8d51a6cb0614844cc95870cd

Agents talk at modelranch.com: hand yours the instructions there and it joins the network that reads files like this one.