messaging-agents SKILL.md skillA
messaging-agents 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/messaging-agents@git:20260924.ff6e766Pins git:20260924.ff6e766 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/messaging-agents/SKILL.md- Versions recorded
- 8
- Latest version
- git:20260924.ff6e766, committed Sep 24, 2026
- First version recorded
- Apr 24, 2026
- Size
- 10,714 bytes
- Repository stars
- 3,790
- License
- Apache-2.0
Send a message to another Letta agent, continue a thread with one, check on it, or reply to a message another agent sent you. Use when you need to ask, inform, or coordinate with another agent, or when a message from another agent arrives.
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
# Messaging Agents ## What you are addressing An **agent** is a persistent identity: its memory and configuration are shared by all of its conversations. A **conversation** is one message thread on an agent. Address a conversation ID to continue a thread; address an agent ID to open a new thread with that agent. When your send identifies you as the sender, a new thread is created hidden so agent-to-agent traffic does not clutter the recipient's conversation list. ## Two backends Letta Code keeps agent state on one of two backends. The same CLI addresses agents on either; what differs is what happens after you send. **Cloud backend** (api.letta.com). Agent state lives in Cloud. Cloud can deliver messages to a *computer*: a machine running Letta Code connected to Cloud, or a Cloud sandbox. Because state and execution are separate, Cloud tracks which computers are online and where each conversation is active. That is why these exist only on this backend: - delivering your message to the harness already running the recipient's conversation, or to its saved destination (a computer or Cloud sandbox) when none is active; - a `computer` selector on sends and on the Agent tool; …
Read the whole file at its exact version.
How to install
mdr add letta-ai/letta-code/messaging-agents@sha256:e35d6146e5b819a3The line at the top of this page pins the label git:20260924.ff6e766, 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_cqo4hhgzx32drhjp)
6 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 8 versions of this file, between Apr 24, 2026 and Sep 24, 2026, about one every 22 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260924.ff6e766 latest | 2026-09-24 | ff6e766 | 10,714 B | A | view · diff |
| git:20260913.ec48fd6 | 2026-09-13 | ec48fd6 | 11,014 B | A | view · diff |
| git:20260912.b9e1a88 | 2026-09-12 | b9e1a88 | 8,559 B | A | view · diff |
| git:20260907.238ca5a | 2026-09-07 | 238ca5a | 7,248 B | A | view · diff |
| git:20260902.680cba4 | 2026-09-02 | 680cba4 | 6,807 B | A | view · diff |
| git:20260827.7d95550 | 2026-08-27 | 7d95550 | 6,862 B | A | view · diff |
| git:20260706.7193f5e | 2026-07-06 | 7193f5e | 7,000 B | A | view · diff |
| git:20260424.238af7d | 2026-04-24 | 238af7d | 5,360 B | A | view |
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 (10714 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_cqo4hhgzx32drhjp GET https://markdownregistry.com/api/v1/resolve?ref=letta-ai/letta-code/messaging-agents GET https://markdownregistry.com/api/v1/blob/e35d6146e5b819a3ee441e6ba08226513271896191f4b13f5b6d22522b26c812
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.