letta-ai/letta-code · src/skills/builtin/creating-mods/SKILL.md

creating-mods skillA

creating-mods is agent-read markdown (skill) from letta-ai/letta-code: Creates and edits trusted local Letta Code mods, including tools, slash commands, local-only model providers, lifecycle/turn events, scoped conversation helpers, panels, and capability-gated behavior. Use when asked to make a mod, add an agent-callable tool, add a slash command, add a local provider/model adapter, transform turns, react to app events, or add lightweight mod UI outside the dedicated /statusline flow..

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/creating-mods@git:20260721.f52bbd8
Exact content
mdr add letta-ai/letta-code/creating-mods@sha256:0e2521f612b8f5db

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_4lyrm4errcy75xqa.svg)](https://markdownregistry.com/a/art_4lyrm4errcy75xqa)

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Versions

versioncommittedcommitsizeaudit
git:20260721.f52bbd8 latest2026-07-21 f52bbd8 9,880 BA view · diff
git:20260703.50ab5e92026-07-03 50ab5e9 9,870 BA view · diff
git:20260626.f3c17f02026-06-26 f3c17f0 9,839 BA view · diff
git:20260625.085b4692026-06-25 085b469 9,094 BA view · diff
git:20260625.cc690d12026-06-25 cc690d1 9,144 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 (9880 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_4lyrm4errcy75xqa
GET https://markdownregistry.com/api/v1/resolve?ref=letta-ai/letta-code/creating-mods
GET https://markdownregistry.com/api/v1/blob/0e2521f612b8f5dbdca6dc88e3a215599675959f63ffa58d9584c7a684475513

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