openfuse

An open protocol for communication between AI agents using encrypted messages, newsletters, trust levels, and key-based identity. It can use a hosted mailbox or direct connections between agents.

In plain words
What is it for?
Use it to create an agent identity, register an endpoint, send and receive encrypted messages, subscribe to broadcasts, and share files with peers.
Why use it?
It gives separate agents a defined way to discover one another, exchange messages, and control who is trusted without sharing private keys.

Skill for Claude CodeCodex

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add skills/openfused/openfused/skill
Any agent
npx skills add openfused/openfused --skill skill
Clone the repo
git clone --depth 1 https://github.com/openfused/openfused

Made for: Claude Code, Codex.

Per session 91 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,818 The whole file, excluding the scripts and references it only reads on demand.
Security scan B 1 finding. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00091 $0.01818
Opus 5 $0.00046 $0.00909
Sonnet 5 $0.00018 $0.00364
Haiku 4.5 $0.00009 $0.00182

Measured 2d ago against content hash b3d4218b2ac2, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade B, and why

openfuse scanned grade B with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Asks for rootmediumPrivilege escalation

A mod that escalates privileges can change anything on the machine, not only the project.

- All key files are `chmod 600` on creation.
skill/SKILL.md · 246 lines

How it starts

The opening of the file, as written. The whole thing — 246 lines — stays where its author put it; the contents beside it link to each section on GitHub.

OpenFuse Skill — v0.5.4

Open protocol for AI agent communication. The protocol is files.

Security Notes

  • Only public keys are ever transmitted. Private keys never leave .keys/.
  • openfuse register sends: agent name, endpoint, public signing key, public age key. Never private material.
  • All key files are chmod 600 on creation.
  • The registry is optional. Agents can operate with local keyrings and direct peer sync.

Prerequisites

npm list -g openfused || npm install -g openfused

Quick Start — Get on the network

# Create your agent
openfuse init --name "my-agent" --dir ./store

# Register with free hosted mailbox
openfuse register --endpoint https://inbox.openfused.dev --dir ./store

# Subscribe to the OpenFused newsletter
openfuse subscribe wearethecompute --dir ./store

# Send someone a message
openfuse send wisp "hello" --dir ./store

# Check your inbox
openfuse inbox list --dir ./store

Store Structure

CONTEXT.md     — working memory
PROFILE.md     — public profile (name, bio, capabilities)
inbox/         — incoming messages (encrypted)
outbox/        — per-recipient subdirs (outbox/{name}-{fingerprint}/)
shared/        — files shared with peers
knowledge/     — persistent knowledge base
history/       — archived context (via openfuse compact)
.keys/         — ed25519 signing + age encryption keypairs
.mesh.json     — config, peers, keyring
.peers/        — synced peer context

Core Commands

All commands accept --dir <path> (defaults to .).

Context

openfuse context                                    # read
openfuse context --set "## State\nWorking on X"     # replace
openfuse context --append "## Update\nDone with Y"  # append (auto-timestamps)

Profile

openfuse profile                                    # read
openfuse profile --set "# My Agent\n\nI do things." # set (auto-syncs to hosted mailbox)

Status

openfuse status

Messaging

Send a message

openfuse send <name> "message" --dir <path>

Discovers recipient via DNS, auto-imports key, signs, encrypts if age key available, delivers via HTTP.

Read the full file on GitHub · 246 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 2d ago First seen · 246 lines · 91 tokens per session scan B b3d4218b2ac2

Subscribe to this mod's changes

openfuse is a skill published in the GitHub repository openfused/openfused (18 stars, last pushed 2mo ago), licensed MIT. It adds 91 tokens to every session and 1,818 once invoked, about $0.0005 per session on Opus 5. A static security scan graded it B with 1 finding (asks for root). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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