letta-development-guide SKILL.md skillA
letta-development-guide from letta-ai/skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add letta-ai/skills/letta-development-guide@git:20260121.078e325Pins git:20260121.078e325 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- letta-ai/skills
- Path
letta/agent-development/SKILL.md- Versions recorded
- 2
- Latest version
- git:20260121.078e325, committed Jan 21, 2026
- First version recorded
- Dec 19, 2025
- Size
- 9,308 bytes
- Repository stars
- 152
- License
- a license file GitHub does not identify
Comprehensive guide for developing Letta agents, including architecture selection, memory design, model selection, and tool configuration. Use when building or troubleshooting Letta agents.
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
# Letta Development Guide
Comprehensive guide for designing and building effective Letta agents with appropriate architectures, memory configurations, model selection, and tool setups.
## When to Use This Skill
Use this skill when:
- Starting a new Letta agent project
- Choosing between agent architectures (letta_v1_agent vs memgpt_v2_agent)
- Designing memory block structure and architecture
- Selecting appropriate models for your use case
- Planning tool configurations
- Optimizing memory management and performance
- Implementing shared memory between agents
- Debugging memory-related issues
## Quick Start Guide
### Minimal Working Example
```python
from letta_client import Letta
client = Letta()
agent = client.agents.create(
name="my-assistant",
model="openai/gpt-4o",
embedding="openai/text-embedding-3-small",
memory_blocks=[
{"label": "persona", "value": "You are a helpful assistant."},
{"label": "human", "value": "The user's name and preferences."},
],
)
# Send a message
response = client.agents.messages.create(
agent_id=agent.id,
messages=[{"role": "user", "content": "Hello!"}],
)
print(response.messages[-1].content)
```
…Read the whole file at its exact version.
How to install
mdr add letta-ai/skills/letta-development-guide@sha256:0e54c5537a3b51fcThe line at the top of this page pins the label git:20260121.078e325, 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_cguc65fkc5djvub4)
4 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 2 versions of this file, between Dec 19, 2025 and Jan 21, 2026, about one every 34 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260121.078e325 latest | 2026-01-21 | 078e325 | 9,308 B | A | view · diff |
| git:20251219.b3de744 | 2025-12-19 | b3de744 | 7,525 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 (9308 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/skills · 152 stars · license a license file GitHub does not identify · pushed 2026-10-01 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_cguc65fkc5djvub4 GET https://markdownregistry.com/api/v1/resolve?ref=letta-ai/skills/letta-development-guide GET https://markdownregistry.com/api/v1/blob/0e54c5537a3b51fcb47e6df3a9e2b2aba6bdaa24e48677076811af6936ef1aca
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.