Nofax

Nofax

Human-in-the-loop approvals and notifications for AI coding agents, without running a Nofax SaaS.

Nofax is a small open-source bridge between an agent and a human. Local mode can pause an AI workflow, notify your phone, and return an explicit decision. An optional self-deployed Cloudflare Worker exposes a deliberately narrower remote MCP surface for one-way notifications and safe request inspection.

No Nofax account. No paid model API. No inbound port on your machine. MIT licensed.

Current status: local Nofax is on the stable 0.2.x line. The optional Cloudflare Worker is the upcoming 0.3.0 remote surface and is developed alongside the local package.

Why Nofax

Agent workflows increasingly need a clean answer to one question: when automation reaches a human decision boundary, how does it ask without pretending that silence means approval?

Nofax keeps that boundary explicit:

• pending is never approval;
• timeout and transport failure fail closed;
• the first accepted terminal response wins;
• agent-specific hook schemas stay isolated in adapters;
• remote access is intentionally narrower than local access;
• Nofax does not grant authority the calling agent did not already have.

Two operating modes

The remote Worker is not a hosted remote-approval service. It can send an informational notification and inspect existing request state, but it has no approval callback, choice, refinement, wait, webhook, or arbitrary remote-write endpoint.

Quick start

1. Install

npm install -g nofax

Requires Node.js 20 or newer.

2. Initialize

nofax init

Nofax creates ~/.nofax/config.json and generates a high-entropy notification topic. With the default transport, subscribe to the displayed topic in the ntfy mobile app.

3. Test

nofax test

4. Use it

nofax notify --title "Build finished" "All tests passed"
nofax approve --title "Deploy?" "Release 1.4.0 is ready"
nofax refine --title "Refine draft" "Tell me what to change"

An approval resolves to stable terminal JSON:

{"decision":"allow"}

or:

{"decision":"deny"}

If the request is still pending, times out, disconnects, or hits a transport error, Nofax never converts that condition into approval.

MCP

Start the local stdio MCP server:

nofax mcp

Local MCP exposes:

• nofax_notify
• nofax_request_approval
• nofax_request_choice
• nofax_request_refinement
• nofax_wait_for_response
• nofax_get_request
• nofax_list_pending

Interactive requests return a durable request ID. nofax_wait_for_response performs a bounded wait; callers must repeat the wait while the request remains pending rather than infer approval.

Agent integrations

Claude Code

Use Nofax as a local PermissionRequest hook in ~/.claude/settings.json:

{
  "hooks": {
    "PermissionRequest": [
      {
        "matcher": ".*",
        "hooks": [
          {
            "type": "command",
            "command": "nofax hook claude"
          }
        ]
      }
    ]
  }
}

Codex

Codex hooks are enabled by default. Configure ~/.codex/hooks.json:

{
  "hooks": {
    "PermissionRequest": [
      {
        "matcher": ".*",
        "hooks": [
          {
            "type": "command",
            "command": "nofax hook codex",
            "statusMessage": "Waiting for Nofax approval"
          }
        ]
      }
    ]
  }
}

Restart Codex, run /hooks, and review/trust the exact Nofax hook definition before relying on it. Codex skips non-managed hooks until they are trusted, and a changed hook definition must be reviewed again. If an administrator or local policy has explicitly disabled hooks, re-enable them with [features] hooks = true in ~/.codex/config.toml.

Codex currently evaluates PermissionRequest hooks before its configured approval reviewer. A terminal Nofax Allow/Deny therefore resolves the request before Codex can route it to approvals_reviewer = "auto_review" (or the legacy guardian_subagent value). If you want Nofax to be the human approval surface, use approvals_reviewer = "user"; do not combine this Nofax approval hook with Auto-review/Guardian expecting both reviewers to run. Current Codex hook input does not expose the effective reviewer, so Nofax cannot safely distinguish a user-routed approval from one that Codex intended to auto-review.

PermissionRequest hooks are also serial with Codex's native approval UI: while Nofax is waiting, the normal Codex approval prompt is not simultaneously available. If Nofax returns no decision (for example after timeout or transport failure), Codex falls back to its normal approval flow. Nofax never converts that fallback condition into approval.

Gemini CLI

Current Gemini CLI builds expose a synchronous BeforeTool hook that can allow or deny a tool call. Route selected tools through Nofax in ~/.gemini/settings.json:

{
  "hooks": {
    "BeforeTool": [
      {
        "matcher": "run_shell_command|write_file|replace",
        "hooks": [
          {
            "name": "nofax-approval",
            "type": "command",
            "command": "nofax hook gemini",
            "timeout": 305000
          }
        ]
      }
    ],
    "Notification": [
      {
        "matcher": "ToolPermission",
        "hooks": [
          {
            "name": "nofax-notification",
            "type": "command",
            "command": "nofax hook gemini"
          }
        ]
      }
    ]
  }
}

BeforeTool waits for an explicit Nofax Allow/Deny result. A Nofax timeout or transport failure returns Gemini's ask decision, forcing the native interactive confirmation instead of allowing an auto-approval policy to treat the missing Nofax decision as permission. The Notification hook remains advisory and is forwarded only as a phone notification.

Adjust the matcher to the tools you want Nofax to gate. Keep the hook timeout longer than Nofax's configured approval timeout (timeoutSeconds, 300 seconds by default).

Optional remote Cloudflare Worker

The worker/ package provides a private, self-deployed MCP endpoint:

remote MCP client
       |
       | authenticated Streamable HTTP
       v
Cloudflare Worker
       |
       +--> nofax_notify ------> ntfy ------> phone
       |
       +--> SQLite Durable Object
              |
              +--> get request metadata
              +--> list pending requests

It exposes exactly three tools:

• nofax_notify — one-way notification only;
• nofax_get_request — read one safe request projection;
• nofax_list_pending — read unresolved, unexpired request projections.

Deploy from worker/:

npm ci
npx wrangler login
npx wrangler secret put NOFAX_REMOTE_KEY
npx wrangler secret put NTFY_TOPIC
npm run check
npm run deploy

Preferred MCP connection:

https://<worker>.workers.dev/mcp
Authorization: Bearer <NOFAX_REMOTE_KEY>

Clients that cannot attach a static authorization header can use the compatibility capability path:

https://<worker>.workers.dev/mcp/<NOFAX_REMOTE_KEY>

Treat the complete capability URL like a password.

See docs/remote-mcp.md for deployment, threat boundaries, and qualification details.

Important: public ntfy + serverless egress

The default public ntfy.sh service applies publisher quotas. Serverless platforms such as Cloudflare Workers may use shared outbound IP space, so a Worker can receive an ntfy 42908 daily-quota response even when that individual Worker has sent very little traffic. That limit is imposed by ntfy, not by the Cloudflare Workers request quota.

For reliability-sensitive deployments, use a notification provider whose quota is tied to your own authenticated account/identity, or operate a trusted self-hosted transport. Do not build a critical workflow around anonymous public-topic quota assumptions.

Security model

Nofax is a transport and human-interaction component, not an authorization policy engine.

Local mode:

• pending, timeout, disconnect, malformed state, and network failure never mean approval;
• the first valid terminal response wins;
• notification topics and one-time response topics are capabilities;
• public ntfy is not end-to-end encrypted from the provider;
• redaction is best-effort and cannot reliably identify secrets embedded in arbitrary free-form text.

Remote mode:

• only explicit nofax_notify performs an external messaging side effect;
• request-inspection operations are read-only and do not perform hidden cleanup writes;
• remote approval, callback, webhook, refinement, choice, and wait surfaces are absent;
• NOFAX_REMOTE_KEY is a bearer credential;
• remote projections omit callback capabilities, prompt/message text, and internal allowed-decision lists.

Read SECURITY.md before using Nofax with sensitive information.

Configuration

Default local config lives at ~/.nofax/config.json:

{
  "version": 1,
  "server": "https://ntfy.sh",
  "topic": "nofax_<random>",
  "timeoutSeconds": 300
}

Override the home directory with NOFAX_HOME:

NOFAX_HOME=/path/to/nofax-home nofax config

Use another ntfy-compatible server with:

nofax init --server https://ntfy.example.com --force

Development

Local package:

npm ci
npm run check
npm test
npm pack --dry-run

Remote Worker:

cd worker
npm ci
npm run check

CI qualifies Node.js 20, 22, and 24 for the local package. The Worker gate runs TypeScript, Vitest, a production-dependency audit, and a Wrangler deployment dry-run.

Project docs

• docs/architecture.md — trust boundaries and data flow
• docs/remote-mcp.md — remote Worker deployment and qualification
• SECURITY.md — security assumptions and vulnerability reporting
• CONTRIBUTING.md — contribution and test expectations
• CHANGELOG.md — release history

Non-goals

Nofax deliberately does not provide:

• a Nofax-operated approval SaaS;
• a paid model API dependency;
• persistent always approve policy;
• an arbitrary remote shell endpoint;
• a public multi-user Worker behind one shared deployment key;
• a claim that MCP annotations themselves are a security boundary.

License

MIT © Tomi Šeregi. See LICENSE.