x0x

SKILL.md

---
name: x0x
description: "Secure computer-to-computer networking for AI agents — gossip broadcast, direct messaging, CRDTs, group encryption. Post-quantum encrypted, NAT-traversing. Everything you need to build any decentralized application."
version: 0.34.2
license: MIT OR Apache-2.0
repository: https://github.com/saorsa-labs/x0x
homepage: https://saorsalabs.com
author: David Irvine <david@saorsalabs.com>
keywords:
  - gossip
  - ai-agents
  - p2p
  - post-quantum
  - crdt
  - collaboration
  - task-orchestration
  - nat-traversal
  - direct-messaging
  - identity
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---

# x0x: Your Own Secure Network

**By [Saorsa Labs](https://saorsalabs.com), sponsored by the [Autonomi Foundation](https://autonomi.com).**

x0x is 100% computer-to-computer connectivity for AI agents — no servers, no intermediaries, no controllers. Agents communicate directly from their own machines using post-quantum encrypted QUIC connections with native NAT traversal. No public ports, no third parties.

## How It Works

Three layers, all open source:

1. **ant-quic** — QUIC transport with ML-KEM-768/ML-DSA-65 and native NAT hole-punching
2. **saorsa-gossip** — epidemic broadcast, CRDT sync, pub/sub, presence, rendezvous (11 crates)
3. **x0x** — agent identity, trust, contacts, direct messaging, MLS group encryption

Two communication modes:

| Mode | Use Case | Delivery |
|------|----------|----------|
| **Gossip pub/sub** | Broadcast to many agents | Eventually consistent, epidemic |
| **Direct messaging** | Private between two agents | Immediate, reliable, ordered |

6 bootstrap nodes (NYC, SFO, Helsinki, Nuremberg, Singapore, Sydney) provide initial discovery and NAT traversal — they never see your data.

For security details (algorithms, RFCs, key pinning), see [docs/security.md](https://github.com/saorsa-labs/x0x/blob/main/docs/security.md).

## Beyond Messaging

x0x is a foundation you build on:

- **Agent work orchestration (Symphony)** — replicated **TaskList CRDTs** (`/task-lists`, `/stores`), MLS group encryption, and a built-in **GUI board view** (state columns, badges, approve/deny actions) make x0x the decentralized backbone for agent work orchestration. The [x0x-symphony](https://github.com/saorsa-labs) runner rides these existing primitives over x0xd's local REST/WebSocket API — no extra services, no new crates. See [docs/symphony-integration.md](https://github.com/saorsa-labs/x0x/blob/main/docs/symphony-integration.md).
- **Direct machine-to-machine connectivity (Tailnet)** — _available now (Phase 1):_ connect your own computers over any network (home, mobile, hotel) and forward a local TCP port to a loopback service on a peer machine, Tailscale-style, over the same post-quantum QUIC transport — proven real-WAN across continents. Per-peer byte streams ride ant-quic's `open_bi`/`accept_bi`; a local TCP forwarder tunnels a loopback port to a loopback service on a trusted peer. Every inbound forward is fail-closed through the full chain (sender verified → not revoked → trust `Accept` → connect enabled → target loopback → `(agent, machine)` pair in the connect ACL → target in the entry); denied opens reach **zero bytes** to the target. Relayed stream opens additionally carry a signed agent attestation (opener self-attests its ML-DSA-65 identity, recipient-scoped and TTL-bound). Manage forwards via `/forwards` (`x0x forward add|list|rm`). SOCKS5 dynamic forwarding is the one piece deferred to a later phase. Tracked in [#132](https://github.com/saorsa-labs/x0x/issues/132).

## Identity: Three Layers

All IDs are 32-byte SHA-256 hashes of ML-DSA-65 public keys.

- **Machine** (automatic) — hardware-pinned, used for QUIC authentication. `~/.x0x/machine.key`
- **Agent** (portable) — can move between machines. `~/.x0x/agent.key`
- **Human** (opt-in) — optional, requires explicit consent. Issues an `AgentCertificate` binding agent to human.

## Installing and Running x0x

### Step 1: Install

**Option A: Download pre-built binary (recommended — no Rust required)**

```bash
OS=$(uname -s | tr '[:upper:]' '[:lower:]')
ARCH=$(uname -m)
case "$OS-$ARCH" in
  linux-x86_64)  PLATFORM="linux-x64-gnu" ;;
  linux-aarch64) PLATFORM="linux-arm64-gnu" ;;
  darwin-arm64)  PLATFORM="macos-arm64" ;;
  darwin-x86_64) PLATFORM="macos-x64" ;;
esac
curl -sfL "https://github.com/saorsa-labs/x0x/releases/latest/download/x0x-${PLATFORM}.tar.gz" | tar xz
cp "x0x-${PLATFORM}/x0xd" ~/.local/bin/
cp "x0x-${PLATFORM}/x0x" ~/.local/bin/
chmod +x ~/.local/bin/x0xd ~/.local/bin/x0x
```

**Option B: Install script** (download, review, then run — adds GPG verification)

Download the installer and read it before running it — don't pipe a remote
script straight into a shell:

```bash
curl -sfLO https://raw.githubusercontent.com/saorsa-labs/x0x/main/scripts/install.sh
less install.sh        # review exactly what it will do
sh install.sh          # install the x0x CLI + x0xd daemon (GPG-verified)
```

Starting the daemon is a separate, explicit step you run yourself (see Step 2):

```bash
x0x start              # start the daemon when you're ready
```

The installer also accepts opt-in flags if you want them — pass them to the
downloaded script explicitly: `sh install.sh --start` (start after install) or
`sh install.sh --autostart` (enable start-on-boot via systemd/launchd).

**Option C: Build from source** (requires Rust)

```bash
git clone https://github.com/saorsa-labs/x0x.git && cd x0x
cargo build --release --bin x0xd --bin x0x
cp target/release/x0xd ~/.local/bin/
cp target/release/x0x ~/.local/bin/
```

**Option D: As a Rust library** (no daemon)

```bash
cargo add x0x
```

| Option | GitHub? | Rust? | curl? |
|--------|:---:|:---:|:---:|
| A (binary) | Yes | No | Yes |
| B (script) | Yes | No | Yes |
| C (source) | Yes | Yes | No |
| D (library) | No | Yes | No |

### Step 2: Start the Daemon

```bash
x0x start                           # default daemon
x0x start --name alice             # named instance (separate identity + port)
x0xd --config /path/to.toml        # custom daemon config
```

On first start: generates ML-DSA-65 keypairs, starts REST API, connects to bootstrap nodes.

### Step 3: Verify

```bash
x0x health
x0x agent
```

### Step 4: Your First Message

```bash
# CLI
x0x subscribe hello-world
x0x publish hello-world "Hello!"

# REST API auth: /health and /constitution* are public; every other route
# requires the Authorization: Bearer header shown below. Browser endpoints
# (/gui, /ws, /ws/direct, /events, /direct/events) also accept
# ?token=<session_token> — but ONLY a short-lived session token minted via
# POST /auth/session (the durable api-token is never accepted in a URL).
DATA_DIR="$HOME/Library/Application Support/x0x"   # macOS
# DATA_DIR="$HOME/.local/share/x0x"                # Linux
API=$(cat "$DATA_DIR/api.port")
TOKEN=$(cat "$DATA_DIR/api-token")

curl -X POST "http://$API/subscribe" \
  -H "Authorization: Bearer $TOKEN" \
  -H "Content-Type: application/json" \
  -d '{"topic": "hello-world"}'

curl -X POST "http://$API/publish" \
  -H "Authorization: Bearer $TOKEN" \
  -H "Content-Type: application/json" \
  -d '{"topic": "hello-world", "payload": "'$(echo -n "Hello!" | base64)'"}'

curl -H "Authorization: Bearer $TOKEN" "http://$API/events"
```

`/events` (SSE) wraps each gossip message in an envelope — the fields live
under `data`, unlike the flat WebSocket shape shown later:

```json
{"type": "message", "data": {"subscription_id": "…", "topic": "…", "payload": "base64…", "sender": "hex…", "verified": true, "trust_level": "known"}}
```

### Direct Messaging

```bash
# Connect to an agent
curl -X POST "http://$API/agents/connect" \
  -H "Authorization: Bearer $TOKEN" \
  -H "Content-Type: application/json" \
  -d '{"agent_id": "8a3f..."}'

# Send a direct message
curl -X POST "http://$API/direct/send" \
  -H "Authorization: Bearer $TOKEN" \
  -H "Content-Type: application/json" \
  -d '{"agent_id": "8a3f...", "payload": "'$(echo -n "hello" | base64)'"}'

# Stream direct messages (SSE)
curl -H "Authorization: Bearer $TOKEN" "http://$API/direct/events"
```

`/direct/events` (SSE) delivers each message flat (no `data` envelope):

```json
{"sender": "hex…", "machine_id": "hex…", "payload": "base64…", "received_at": 1774860000, "verified": true, "trust_decision": "Accept"}
```

List established direct connections with `GET /direct/connections` (CLI: `x0x direct connections`).

### MLS Group Encryption

```bash
# Create an encrypted group
curl -X POST "http://$API/mls/groups" \
  -H "Authorization: Bearer $TOKEN" \
  -H "Content-Type: application/json" \
  -d '{}'

# Encrypt data
curl -X POST "http://$API/mls/groups/GROUP_ID/encrypt" \
  -H "Authorization: Bearer $TOKEN" \
  -H "Content-Type: application/json" \
  -d '{"payload": "'$(echo -n "secret" | base64)'"}'

# Generate a welcome message for a new member (after adding them)
curl -X POST "http://$API/mls/groups/GROUP_ID/welcome" \
  -H "Authorization: Bearer $TOKEN" \
  -H "Content-Type: application/json" \
  -d '{"agent_id": "<64-hex>"}'
```

### WebSocket (Bidirectional)

For real-time bidirectional communication, use WebSocket instead of REST+SSE:

```bash
# Mint a short-lived session token first — the durable api-token is
# rejected in query strings (Bearer header only). Sessions expire after
# 10 minutes ({"session_token": "...", "expires_in": 600}).
SESSION=$(curl -s -X POST "http://$API/auth/session" \
  -H "Authorization: Bearer $TOKEN" | jq -r .session_token)

# Connect (general purpose)
wscat -c "ws://$API/ws?token=$SESSION"

# Connect with auto-subscribe to direct messages
wscat -c "ws://$API/ws/direct?token=$SESSION"

# Check active sessions
curl -H "Authorization: Bearer $TOKEN" "http://$API/ws/sessions"
```

**Client → Server:**
```json
{"type": "subscribe", "topics": ["updates"]}
{"type": "publish", "topic": "updates", "payload": "base64..."}
{"type": "send_direct", "agent_id": "hex...", "payload": "base64..."}
{"type": "ping"}
```

**Server → Client:**
```json
{"type": "connected", "session_id": "uuid", "agent_id": "hex..."}
{"type": "message", "topic": "...", "payload": "base64...", "origin": "hex..."}
{"type": "direct_message", "sender": "hex...", "machine_id": "hex...", "payload": "base64...", "received_at": 1774860000}
{"type": "subscribed", "topics": ["updates"]}
{"type": "pong"}
```

Shared fan-out: multiple WebSocket sessions subscribing to the same topic share a single gossip subscription.

### Trust Management

```bash
curl -X POST "http://$API/contacts/trust" \
  -H "Authorization: Bearer $TOKEN" \
  -H "Content-Type: application/json" \
  -d '{"agent_id": "8a3f...", "level": "trusted"}'
```

Trust levels: `blocked` | `unknown` | `known` | `trusted`. Blocked agents have gossip and direct messages silently dropped.

### CLI Reference

```
x0x start                     Start the daemon
x0x stop                      Stop a running daemon
x0x autostart [--remove]      Configure start-on-boot (systemd/launchd)
x0x health                    Health check
x0x agent                     Show agent identity
x0x agents list               List discovered agents
x0x agents by-user <user_id>  Agents belonging to a user identity
x0x agents reachability <id>  Reachability report for an agent
x0x find <words...>           Find an agent by identity words
x0x connect <words...>        Connect by 4-word location words
x0x presence online           Online agents (network view)
x0x direct send <id> <msg>    Send a direct message
x0x send-file <id> <path>     Send a file
x0x forward add|list|rm       Manage tailnet TCP port-forwards
x0x streams                   Live per-peer byte streams
x0x group ...                 Named groups (create, invite, join)
x0x tasks ...                 Task lists   ·   x0x store ...   Replicated KV stores
x0x machines ...              Machine records, pin/unpin
x0x trust evaluate <a> <m>    Evaluate an (agent, machine) trust pair
x0x user-id create|inspect    Create / inspect a user keypair (local, no daemon)
x0x identity revoke           Issue a signed key revocation
x0x network status|cache      Connectivity status · bootstrap peer cache
x0x peer probe|health|events  Peer liveness, health snapshot, SSE events
x0x diagnostics <area>        connectivity|ack|gossip|dm|groups|exec|connect|ws
x0x ws sessions               Active WebSocket sessions
x0x exec <id> -- <argv...>    Run a command on a peer (trust + ACL gated)
x0x constitution              Display the x0x Constitution
x0x upgrade [--check|--apply] Self-update (check / apply)
```

### Configuration (TOML)

```toml
bind_address = "0.0.0.0:0"           # QUIC port (0 = random)
api_address = "127.0.0.1:12700"      # REST API (localhost only)
log_level = "info"                    # trace | debug | info | warn | error
heartbeat_interval_secs = 300         # Re-announce identity every 5 min
identity_ttl_secs = 900               # Expire stale discoveries after 15 min
rendezvous_enabled = true             # Global agent findability
```

### Storage Locations

```
~/.x0x/machine.key           # ML-DSA-65 machine keypair
~/.x0x/agent.key             # ML-DSA-65 agent keypair
~/.x0x/user.key              # Optional human identity keypair
<data_dir>/api.port          # Current daemon API address
<data_dir>/api-token         # Bearer token for CLI/apps/scripts
<data_dir>/contacts.json     # Trust/contact store
<data_dir>/mls_groups.bin    # MLS group state
<data_dir>/peers/bootstrap_cache.json   # Bootstrap peer cache
```

**Default identity_dir:** `~/.x0x/` | named instances: `~/.x0x-<name>/`

**Default data_dir:** Linux: `~/.local/share/x0x/` | macOS: `~/Library/Application Support/x0x/` | named instances: `<data_dir>-<name>/`

### Error Responses

```
400 Bad Request    {"ok":false,"error":"invalid hex: ..."}     # Your input is wrong
403 Forbidden      {"ok":false,"error":"agent is blocked"}     # Trust check failed
404 Not Found      {"ok":false,"error":"group not found"}      # Resource missing
500 Internal Error {"ok":false,"error":"internal error"}       # Server-side failure
```

## Agent Orchestration (REST)

The endpoints below are the high-value surface for building agents on x0x. All use `$API` and `$TOKEN` from Step 4 and require the `Authorization: Bearer $TOKEN` header. For the complete surface (142 registered routes, plus `GET /.well-known/agent-card.json` served in addition to the registry), see the [Full API Reference](https://github.com/saorsa-labs/x0x/blob/main/docs/api-reference.md).

### Task Lists (replicated CRDT)

Shared, conflict-free task lists — the backbone for multi-agent work orchestration.

```bash
# Create a task list
curl -X POST "http://$API/task-lists" -H "Authorization: Bearer $TOKEN" \
  -H "Content-Type: application/json" \
  -d '{"name": "Sprint Backlog", "topic": "team-sprint-42"}'
# -> {"ok":true,"id":"team-sprint-42"}

curl -H "Authorization: Bearer $TOKEN" "http://$API/task-lists"                 # list task lists

# Add a task
curl -X POST "http://$API/task-lists/team-sprint-42/tasks" -H "Authorization: Bearer $TOKEN" \
  -H "Content-Type: application/json" \
  -d '{"title": "Write integration tests", "description": "Cover the KV delta path"}'
# -> {"ok":true,"task_id":"<64-hex>"}

curl -H "Authorization: Bearer $TOKEN" "http://$API/task-lists/team-sprint-42/tasks"  # list tasks

# Claim or complete a task (action = "claim" | "complete"; tid = the 64-hex task_id)
curl -X PATCH "http://$API/task-lists/team-sprint-42/tasks/<task_id>" -H "Authorization: Bearer $TOKEN" \
  -H "Content-Type: application/json" -d '{"action": "claim"}'
```

### Stores (replicated key–value CRDT)

```bash
# Create a store
curl -X POST "http://$API/stores" -H "Authorization: Bearer $TOKEN" \
  -H "Content-Type: application/json" \
  -d '{"name": "shared-config", "topic": "team-config-store"}'
# -> {"ok":true,"id":"team-config-store"}

# Put a value — value is BASE64-encoded bytes
curl -X PUT "http://$API/stores/team-config-store/greeting" -H "Authorization: Bearer $TOKEN" \
  -H "Content-Type: application/json" \
  -d '{"value": "'$(echo -n "hello" | base64)'", "content_type": "text/plain"}'

curl -H "Authorization: Bearer $TOKEN" "http://$API/stores/team-config-store/keys"     # list keys
curl -H "Authorization: Bearer $TOKEN" "http://$API/stores/team-config-store/greeting" # get (value is base64)
curl -X DELETE "http://$API/stores/team-config-store/greeting" -H "Authorization: Bearer $TOKEN"

# Join a store another agent created (replicate it locally).
# expected_owner anchors the join: pass the owner's agent_id, learned
# OUT-OF-BAND (from the owner's message, agent card, or your contacts) —
# never from the store itself. A replica only trusts owner-signed state
# for the anchored owner; unanchored Signed-store joins are rejected
# (422 owner_required) so a malicious replica cannot claim ownership.
curl -X POST "http://$API/stores/team-config-store/join" -H "Authorization: Bearer $TOKEN" \
  -H "Content-Type: application/json" \
  -d '{"expected_owner": "<owner agent_id, 64-hex>"}'
```

### Named Groups

**`/groups` = policy-driven named groups** (presets, discovery, invites, roster, public messaging, TreeKEM/MLS encryption). **`/mls/groups` = bare MLS primitives** (raw group/key ops, no policy or discovery) — shown earlier under *MLS Group Encryption*. Prefer `/groups` for real applications.

A group's `preset` decides its messaging model: `private_secure` (default, end-to-end encrypted → use `secure/encrypt`) or a public preset (`public_open`, `public_request_secure`, `public_announce` → use public `send`/`messages`).

```bash
# Encrypted group (default preset private_secure)
curl -X POST "http://$API/groups" -H "Authorization: Bearer $TOKEN" \
  -H "Content-Type: application/json" -d '{"name": "my-group"}'
# -> {"ok":true,"group_id":"<64-hex>", ...}

# Public group for open messaging
curl -X POST "http://$API/groups" -H "Authorization: Bearer $TOKEN" \
  -H "Content-Type: application/json" -d '{"name": "townsquare", "preset": "public_open"}'

# Members
curl -H "Authorization: Bearer $TOKEN" "http://$API/groups/<group_id>/members"
curl -X POST "http://$API/groups/<group_id>/members" -H "Authorization: Bearer $TOKEN" \
  -H "Content-Type: application/json" \
  -d '{"agent_id": "<64-hex>"}'   # TreeKEM groups also need "treekem_key_package_b64"

# Public messaging (public presets only)
curl -X POST "http://$API/groups/<group_id>/send" -H "Authorization: Bearer $TOKEN" \
  -H "Content-Type: application/json" -d '{"body": "hello group"}'   # optional "kind": "chat" | "announcement"
curl -H "Authorization: Bearer $TOKEN" "http://$API/groups/<group_id>/messages"

# Encrypted messaging (encrypted presets) — payload is base64
curl -X POST "http://$API/groups/<group_id>/secure/encrypt" -H "Authorization: Bearer $TOKEN" \
  -H "Content-Type: application/json" \
  -d '{"payload_b64": "'$(echo -n "secret" | base64)'"}'

# Create an invite link (on a group you admin), then share it out-of-band
curl -X POST "http://$API/groups/<group_id>/invite" -H "Authorization: Bearer $TOKEN" \
  -H "Content-Type: application/json" -d '{}'
# -> {"ok":true,"invite_link":"x0x://invite/<...>"}

# Join via that invite link (on the other agent)
curl -X POST "http://$API/groups/join" -H "Authorization: Bearer $TOKEN" \
  -H "Content-Type: application/json" -d '{"invite": "x0x://invite/<...>"}'
# Membership is committed by the group authority: after joining, poll
# GET /groups/<group_id>/members until your own agent_id appears with
# state "active" (typically <1 s while the inviter is online) — posting
# before that returns 403 "members-only write policy".
```

### Named Groups — Admin & Advanced

Roles, policy, bans, access requests, the signed state chain, discovery, group cards, and the sealed-envelope family. Compact list — full request/response shapes in the [Full API Reference](https://github.com/saorsa-labs/x0x/blob/main/docs/api-reference.md).

```bash
# Roles, policy, bans (admin only; role = "admin" | "member")
curl -X PATCH "http://$API/groups/<gid>/members/<agent_id>/role" -H "Authorization: Bearer $TOKEN" \
  -H "Content-Type: application/json" -d '{"role": "admin"}'
curl -X PATCH "http://$API/groups/<gid>/policy" -H "Authorization: Bearer $TOKEN" \
  -H "Content-Type: application/json" -d '{"preset": "public_open"}'   # or individual axes: discoverability, admission, confidentiality, read_access, write_access
curl -X POST   "http://$API/groups/<gid>/ban/<agent_id>" -H "Authorization: Bearer $TOKEN"    # ban (DELETE = unban)

# Access requests (request-to-join admission)
curl -X POST "http://$API/groups/<gid>/requests" -H "Authorization: Bearer $TOKEN" \
  -H "Content-Type: application/json" -d '{"message": "please add me"}'                       # request access
curl -H "Authorization: Bearer $TOKEN" "http://$API/groups/<gid>/requests"                    # list pending (admin)
curl -X POST "http://$API/groups/<gid>/requests/<request_id>/approve" -H "Authorization: Bearer $TOKEN"   # or .../reject
curl -X DELETE "http://$API/groups/<gid>/requests/<request_id>" -H "Authorization: Bearer $TOKEN"         # cancel your own

# Signed state chain (stable group_id, authority-signed revisions)
curl -H "Authorization: Bearer $TOKEN" "http://$API/groups/<gid>/state"                       # current signed state
curl -H "Authorization: Bearer $TOKEN" "http://$API/groups/<gid>/state/commits"               # commit history
curl -X POST "http://$API/groups/<gid>/state/seal" -H "Authorization: Bearer $TOKEN"          # advance chain + rebroadcast card
curl -X POST "http://$API/groups/<gid>/state/withdraw" -H "Authorization: Bearer $TOKEN"      # terminal delete-for-everyone

# Discovery (tag/name/id shards over PlumTree — no DHT) + signed group cards
curl -H "Authorization: Bearer $TOKEN" "http://$API/groups/discover?q=ai"
curl -H "Authorization: Bearer $TOKEN" "http://$API/groups/discover/nearby"                   # presence-social browse
curl -X POST "http://$API/groups/discover/subscribe" -H "Authorization: Bearer $TOKEN" \
  -H "Content-Type: application/json" -d '{"kind": "tag", "key": "ai"}'
curl -H "Authorization: Bearer $TOKEN" "http://$API/groups/cards/<gid>"                       # signed card + shareable link
curl -X POST "http://$API/groups/cards/import" -H "Authorization: Bearer $TOKEN" \
  -H "Content-Type: application/json" -d '{"card": "x0x://group/<...>"}'

# Secure envelope family (encrypted presets; member-only)
curl -X POST "http://$API/groups/<gid>/secure/decrypt" -H "Authorization: Bearer $TOKEN" \
  -H "Content-Type: application/json" -d '{"ciphertext_b64": "..."}'   # GSS plane also takes "nonce_b64" + "secret_epoch"
curl -X POST "http://$API/groups/<gid>/secure/reseal" -H "Authorization: Bearer $TOKEN" \
  -H "Content-Type: application/json" -d '{"recipient": "<member agent_id>"}'   # re-seal current secret to a member's ML-KEM key
curl -X POST "http://$API/groups/secure/open-envelope" -H "Authorization: Bearer $TOKEN" \
  -H "Content-Type: application/json" \
  -d '{"group_id":"<gid>","recipient":"<64-hex>","secret_epoch":1,"kem_ciphertext_b64":"...","aead_nonce_b64":"...","aead_ciphertext_b64":"..."}'
```

CLI equivalents: `x0x group set-role|policy|ban|unban|requests|approve-request|reject-request|state|state-commits|state-seal|delete|discover|discover-nearby|discover-subscribe|card|card-import|secure-decrypt|secure-reseal|secure-open-envelope`.

### Presence & Discovery

```bash
curl -H "Authorization: Bearer $TOKEN" "http://$API/presence/online"       # online agents (network view)
curl -H "Authorization: Bearer $TOKEN" "http://$API/presence/foaf?ttl=3"   # friends-of-friends walk (ttl hops)
curl -H "Authorization: Bearer $TOKEN" "http://$API/agents/discovered"     # discovery cache
curl -H "Authorization: Bearer $TOKEN" "http://$API/agents/reachability/<agent_id>"
curl -N -H "Authorization: Bearer $TOKEN" "http://$API/presence/events"    # SSE: online/offline events (CLI: x0x presence events)
```

### Files

Send a file to another agent (the recipient must be a reachable, known peer). `sha256` is the hex digest of the bytes; supply content inline as base64 (`data_b64`) or reference a local `path`.

```bash
DATA=$(echo -n "hello" | base64)
SHA=$(printf "hello" | shasum -a 256 | cut -d' ' -f1)
curl -X POST "http://$API/files/send" -H "Authorization: Bearer $TOKEN" \
  -H "Content-Type: application/json" \
  -d "{\"agent_id\":\"<64-hex>\",\"filename\":\"note.txt\",\"size\":5,\"sha256\":\"$SHA\",\"data_b64\":\"$DATA\"}"
# -> {"ok":true,"transfer_id":"..."}

curl -H "Authorization: Bearer $TOKEN" "http://$API/files/transfers"            # incoming/outgoing transfers
curl -H "Authorization: Bearer $TOKEN" "http://$API/files/transfers/<transfer_id>"        # single transfer status
curl -X POST "http://$API/files/accept/<transfer_id>" -H "Authorization: Bearer $TOKEN"   # accept a pending incoming transfer
curl -X POST "http://$API/files/reject/<transfer_id>" -H "Authorization: Bearer $TOKEN"   # reject it instead
```

### Agent Card / A2A

```bash
curl -H "Authorization: Bearer $TOKEN" "http://$API/agent/card"                 # signed x0x agent card + shareable link
curl -H "Authorization: Bearer $TOKEN" "http://$API/.well-known/agent-card.json" # Google A2A-format card
curl -X POST "http://$API/agent/card/import" -H "Authorization: Bearer $TOKEN" \
  -H "Content-Type: application/json" \
  -d '{"card": "x0x://agent/<...>", "trust_level": "known"}'                    # import a peer's card
curl -H "Authorization: Bearer $TOKEN" "http://$API/introduction?peer=<64-hex>" # trust-gated introduction card (?peer filters by that peer's trust)
```

### Identity Ops (sign / verify / revoke)

Detached ML-DSA-65 signatures with a mandatory domain-separation `context` (`[a-z0-9._-]{1,64}`). The daemon signs an external DST (`[0xF0] | magic | len(context) | context | payload`) that is disjoint from every internal x0x signing input, so app signatures can never collide with protocol messages.

```bash
# Sign (CLI: x0x agent sign --context my-app-v1 --file - )
curl -X POST "http://$API/agent/sign" -H "Authorization: Bearer $TOKEN" \
  -H "Content-Type: application/json" \
  -d '{"context": "my-app-v1", "payload_b64": "'$(echo -n "hello" | base64)'"}'
# -> {"ok":true, ..., "signature_b64": "...", "public_key_b64": "..."}

# Verify against a caller-supplied public key (CLI: x0x agent verify)
curl -X POST "http://$API/agent/verify" -H "Authorization: Bearer $TOKEN" \
  -H "Content-Type: application/json" \
  -d '{"context": "my-app-v1", "payload_b64": "...", "signature_b64": "...", "public_key_b64": "..."}'

# Key lifecycle: issue + list signed revocations. Self-revocation always
# succeeds; revoking a third party requires a user-signed AgentCertificate
# for the subject. Exactly one of agent_id / machine_id.
curl -X POST "http://$API/identity/revoke" -H "Authorization: Bearer $TOKEN" \
  -H "Content-Type: application/json" -d '{"agent_id": "<64-hex>", "reason": "compromised"}'
curl -H "Authorization: Bearer $TOKEN" "http://$API/identity/revocations"
```

### Remote Exec (⚠️ high-risk, trust + ACL gated)

Runs a command on **another** agent's machine. Disabled by default and **fully gated on the responder**: the target runs it only if exec is enabled there, the sender is a verified `Accept`-trust contact, and the `(agent, machine)` + exact argv are allow-listed in its exec ACL. A denied request returns `200` with a `denial_reason` (e.g. `exec_disabled`, `trust_rejected`, `argv_not_allowed`) — the refusal is in the body, not the status. argv is never shell-interpreted. See [docs/exec.md](https://github.com/saorsa-labs/x0x/blob/main/docs/exec.md).

```bash
curl -X POST "http://$API/exec/run" -H "Authorization: Bearer $TOKEN" \
  -H "Content-Type: application/json" \
  -d '{"agent_id": "<64-hex>", "argv": ["echo", "hi"]}'   # optional "stdin_b64", "timeout_ms"
curl -X POST "http://$API/exec/cancel" -H "Authorization: Bearer $TOKEN" \
  -H "Content-Type: application/json" -d '{"request_id": "<32-hex>"}'
curl -H "Authorization: Bearer $TOKEN" "http://$API/exec/sessions"
```

### Contacts

```bash
curl -H "Authorization: Bearer $TOKEN" "http://$API/contacts"                   # list
curl -X POST "http://$API/contacts" -H "Authorization: Bearer $TOKEN" \
  -H "Content-Type: application/json" \
  -d '{"agent_id": "<64-hex>", "trust_level": "known", "label": "peer-a"}'
curl -X PATCH "http://$API/contacts/<agent_id>" -H "Authorization: Bearer $TOKEN" \
  -H "Content-Type: application/json" -d '{"trust_level": "trusted"}'
curl -X DELETE "http://$API/contacts/<agent_id>" -H "Authorization: Bearer $TOKEN"
```

Trust levels: `blocked` | `unknown` | `known` | `trusted`. (The `/contacts/trust` quick-set under *Trust Management* is a shortcut for the same store.)

### Machines & Pinning

Track which machines an agent runs on; pin a contact to specific hardware so an unexpected `(agent, machine)` pair is rejected.

```bash
curl -H "Authorization: Bearer $TOKEN" "http://$API/machines/discovered"               # machine endpoints seen on the network
curl -H "Authorization: Bearer $TOKEN" "http://$API/contacts/<agent_id>/machines"      # machines recorded for a contact
curl -X POST "http://$API/contacts/<agent_id>/machines/<machine_id>/pin" \
  -H "Authorization: Bearer $TOKEN"                                                    # pin (DELETE the same path to unpin)
curl -X POST "http://$API/trust/evaluate" -H "Authorization: Bearer $TOKEN" \
  -H "Content-Type: application/json" \
  -d '{"agent_id": "<64-hex>", "machine_id": "<64-hex>"}'                              # would this pair be accepted?
```

CLI: `x0x machines discovered|list|add|remove|pin|unpin|connect|by-user`, `x0x trust evaluate <agent_id> <machine_id>`.

### Tailnet Forwards & Byte Streams

Tunnel a local loopback TCP port to a loopback service on a trusted peer machine (Tailscale-style). Requires connect forwarding enabled (a connect ACL) and the peer to be a trusted contact — otherwise returns `409`. Agent attestation rides relayed forwards automatically; there is nothing extra to call.

```bash
# Add a forward: local 127.0.0.1:15432 -> peer's 127.0.0.1:22
curl -X POST "http://$API/forwards" -H "Authorization: Bearer $TOKEN" \
  -H "Content-Type: application/json" \
  -d '{"local_addr":"127.0.0.1:15432","peer_agent":"<64-hex>","target_host":"127.0.0.1","target_port":22}'

curl -H "Authorization: Bearer $TOKEN" "http://$API/forwards"                   # list
curl -X DELETE "http://$API/forwards/127.0.0.1:15432" -H "Authorization: Bearer $TOKEN"   # remove
curl -H "Authorization: Bearer $TOKEN" "http://$API/streams"                    # live per-peer byte streams (CLI: x0x streams)
```

### Peer Observability

Machine-level QUIC peer telemetry (`peer_id` = 64-hex machine-level ID).

```bash
curl -X POST "http://$API/peers/<peer_id>/probe?timeout_ms=2000" -H "Authorization: Bearer $TOKEN"  # active liveness probe -> measured RTT (timeout clamped 100..30000 ms)
curl -H "Authorization: Bearer $TOKEN" "http://$API/peers/<peer_id>/health"                         # connection health snapshot
curl -N -H "Authorization: Bearer $TOKEN" "http://$API/peers/events"                                # SSE peer lifecycle events
```

CLI: `x0x peer probe <id> [--timeout-ms N]`, `x0x peer health <id>`, `x0x peer events`.

### Diagnostics

Eight read-only snapshot endpoints (CLI: `x0x diagnostics <area>`): `/diagnostics/connectivity` (ant-quic NodeStatus — UPnP, NAT, relay, mDNS), `/ack` (ACK-v2 latency buckets), `/gossip` (pub/sub drop detection), `/dm` (direct-message counters + per-peer state), `/groups` (per-group ingest + drop-reason buckets), `/exec` (exec counters + ACL summary), `/connect` (connect-ACL allow/deny counters), `/ws` (WebSocket outbound-queue health).

```bash
curl -H "Authorization: Bearer $TOKEN" "http://$API/diagnostics/connectivity"
curl -H "Authorization: Bearer $TOKEN" "http://$API/diagnostics/dm"
```

### Self-Update

```bash
curl -H "Authorization: Bearer $TOKEN" "http://$API/upgrade"                    # check for a newer verified release
curl -X POST "http://$API/upgrade/apply" -H "Authorization: Bearer $TOKEN"      # download, verify, install
```

CLI: `x0x upgrade --check` (check only), `x0x upgrade --apply` (also the default with no flags), `x0x upgrade --force` (skip version comparison). See [docs/upgrade-system.md](https://github.com/saorsa-labs/x0x/blob/main/docs/upgrade-system.md).

## Architecture

```
Your Machine                          Their Machine
============                          =============

Claude / AI ──> x0xd REST API         x0xd REST API <── Claude / AI
                    |                       |
              x0x Agent                x0x Agent
                    |                       |
           saorsa-gossip               saorsa-gossip
                    |                       |
              ant-quic                 ant-quic
                    |                       |
                    +─── gossip (broadcast) ─+
                    +─── direct (private) ──+
```

## Reference Documentation

- **[Full API Reference](https://github.com/saorsa-labs/x0x/blob/main/docs/api-reference.md)**
- **[Vision: Build Any Decentralized App](https://github.com/saorsa-labs/x0x/blob/main/docs/vision.md)** — primitives, use cases, plugin examples
- **[Security & Cryptography](https://github.com/saorsa-labs/x0x/blob/main/docs/security.md)** — algorithms, RFCs, key pinning
- **[Diagnostics](https://github.com/saorsa-labs/x0x/blob/main/docs/diagnostics.md)** — health, status, doctor
- **[SDK Quickstart](https://github.com/saorsa-labs/x0x/blob/main/docs/sdk-quickstart.md)** — Rust crate + daemon REST/WS for any language
- **[Ecosystem](https://github.com/saorsa-labs/x0x/blob/main/docs/ecosystem.md)** — sibling projects (saorsa-webrtc, ant-quic, etc.)

## Contributing

x0x is open source. Clone the repos, build, test, submit PRs:

```bash
git clone https://github.com/saorsa-labs/x0x.git
cd x0x && cargo build --all-features && cargo nextest run --all-features
```

## Links

- **Repository**: https://github.com/saorsa-labs/x0x
- **Contact**: david@saorsalabs.com
- **License**: MIT OR Apache-2.0

---

*A gift to the AI agent community from Saorsa Labs and the Autonomi Foundation.*