# letta-ai/agent-file

Agent File (.af): An open file format for serializing stateful AI agents with persistent memory and behavior. Share, checkpoint, and version control agents across compatible frameworks.

Repository: https://github.com/letta-ai/agent-file
Canonical: https://ross.abutalabs.com/products/agent-file
Homepage: https://agentfile-directory.vercel.app
Language: TypeScript
License: Apache-2.0
License Family: permissive
Last push: 2026-03-24T17:18:32+00:00

## Health v2 (maintenance only)
Score: 52/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 73, release rhythm 35, longevity 37
- inputs: {"age_days": 528, "days_push": 162, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1196, forks 114 (observed 2026-08-28T04:03:56.927422+00:00)

## What it is
Agent File (.af) is an open file format for serializing stateful AI agents, packaging system prompts, persistent memory, tool configurations, and LLM settings into a portable file. This repository provides the format specification, example agents, and SDKs for importing and deploying .af files to Letta servers.

## Use cases
- share AI agents with persistent memory as files
- checkpoint and version control agent state
- transfer agents between compatible frameworks
- import a prebuilt agent into my Letta server
- distribute agents with personality and memory baked in

## When to choose
- you use Letta or a compatible framework and want portable, checkpointable agent state
- you want to share or version-control agents with memory and tool configs as files

## When to avoid
- you need a general agent framework rather than a serialization format
- your framework does not support the .af standard

## Facets
- artifact type: library
- maturity: active
- function: serialization, agent-framework, sdk
- domain: artificial-intelligence, large-language-models, developer-tools
- platform: python, cross-platform
- tags: agent-file-format, stateful-agents, agent-portability, agent-checkpointing, open-standard, letta, ai-agents, nodejs, typescript

## Member repositories
- letta-ai/agent-file (main) score 52

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:03:56.927422+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T06:22:03.001344+00:00, confidence not recorded.
  - readme: https://github.com/letta-ai/agent-file (fetched 2026-08-28T04:03:56.927422+00:00, sha 9672b5d5cf1f)
  - homepage: https://agentfile-directory.vercel.app (fetched 2026-08-29T12:28:54.686245+00:00, sha a10f8ecd8fd9)
- Data as of 2026-08-30T08:39:29.467469+00:00.