using-mcp-tools SKILL.md skillA
using-mcp-tools from letta-ai/letta-code is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add letta-ai/letta-code/using-mcp-tools@git:20260901.ba6cfe4Pins git:20260901.ba6cfe4 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- letta-ai/letta-code
- Path
src/skills/builtin/using-mcp-tools/SKILL.md- Versions recorded
- 1
- Latest version
- git:20260901.ba6cfe4, committed Sep 1, 2026
- Size
- 3,585 bytes
- Repository stars
- 3,790
- License
- Apache-2.0
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.
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
# Using MCP tools
`letta mcp` gives the agent one unified view of every MCP server it can reach: servers connected to the agent in Letta Cloud and servers configured locally on this machine. It works from any surface where the agent runs — cloud sandboxes (chat.letta.com), Letta Desktop, and terminals. All output is JSON.
## Commands
```bash
letta mcp list # servers: [{name, transport}]
letta mcp get <server> # one server's connection configuration (credentials redacted)
letta mcp tools [server] # tool names + descriptions only
letta mcp tools [server] --full # ...including every tool's complete schema
letta mcp schema <tool-name> # one tool's complete schema
letta mcp search <query> [--mode] [--limit] # ranked tool schemas: [{tool, rank, score}]
letta mcp call <tool-name> [--args | --args-file] # run a tool, print a CallToolResult
```
Every command accepts `--agent <id>`, defaulting to `LETTA_AGENT_ID`/`AGENT_ID` — do not pass it unless targeting another agent.
## Search options
…Read the whole file at its exact version.
How to install
mdr add letta-ai/letta-code/using-mcp-tools@sha256:31f2083652c10a52The line at the top of this page pins the label git:20260901.ba6cfe4, 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_6osy777li7bzc2ab)
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Versions
The registry has recorded 1 version of this file, committed on Sep 1, 2026.
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 (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
letta-ai/letta-code · 3,790 stars · license Apache-2.0 · pushed 2026-11-06 · 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
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.