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firefox-relay-mcp: Instructions file for Codex

AGENTS.md

firefox-relay-mcp AGENTS.md is an instructions file for Codex, OpenCode from nazar256/firefox-relay-mcp. It costs 193 tokens per session, scanned A, original, MIT.

Repository instructions for a stateless Cloudflare Worker that acts as an MCP gateway for Firefox Relay, a service for creating email aliases. They describe commands, required documentation, and rules for protecting credentials and user data.

In plain words
What is it for?
They help an agent test, type-check, run, and deploy the gateway while maintaining its documentation and security guardrails.
Why use it?
They prevent changes that would add forbidden storage or authentication and help keep sensitive Firefox Relay information out of logs.

Instructions file for CodexOpenCode

Written for Codex and OpenCode: the file is AGENTS.md.

This is nazar256/firefox-relay-mcp's own configuration. It tells Codex and OpenCode how to work on firefox-relay-mcp itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything firefox-relay-mcp configures →

not rated 0repo 2mo ago A scan 193 tokens original MIT
View source ↗ nazar256/firefox-relay-mcp
Reuse

Borrowing it

Nothing to install: this file belongs to nazar256/firefox-relay-mcp. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/nazar256/firefox-relay-mcp/main/AGENTS.md
Clone the repo
git clone --depth 1 https://github.com/nazar256/firefox-relay-mcp

Made for: Codex, OpenCode.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for firefox-relay-mcp AGENTS.md

README.md
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Your own site
<a href="https://agentmods.dev/instructions/nazar256/firefox-relay-mcp/agents-md"><img src="https://agentmods.dev/badge/instructions/nazar256/firefox-relay-mcp/agents-md/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

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Your own site · 80×15
<a href="https://agentmods.dev/instructions/nazar256/firefox-relay-mcp/agents-md"><img src="https://agentmods.dev/badge/instructions/nazar256/firefox-relay-mcp/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 193 This file is loaded in full into every session.
When invoked 193 The same file — it is already loaded in full.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
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 5.1 $0.00193 $0.00193
Opus 5.5 $0.00077 $0.00077
Sonnet 5.5 $0.00039 $0.00039
Haiku 4.5 $0.00019 $0.00019

Measured 2mo ago against content hash 4edad3f7e61c, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

firefox-relay-mcp AGENTS.md scanned grade A with 0 findings 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 2mo 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.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

AGENTS.md · 29 lines

What it actually says

AGENTS

Purpose

This repository hosts a stateless Cloudflare Worker MCP gateway for Firefox Relay.

Common commands

  • npm test
  • npm run typecheck
  • npm run dev
  • npm run deploy

Required docs to keep current

  • README.md
  • docs/PRODUCT_REQUIREMENTS.md
  • docs/IMPLEMENTATION_PLAN.md
  • docs/PROJECT_STATE.md
  • docs/DECISIONS.md
  • docs/RUNBOOK.md

Guardrails

  • Keep the Worker stateless: no DB, KV, Durable Objects, cache-backed sessions, or token persistence.
  • Never log Firefox Relay API keys, Authorization headers, JWTs, decrypted envelopes, cookies, or CSRF tokens.
  • Do not add Firefox Accounts OAuth, cookie auth, or delete-mask tooling in v1.
  • Keep @modelcontextprotocol/sdk pinned to the production-safe v1 line.
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. 2mo ago First seen · 29 lines · 193 tokens per session scan A 4edad3f7e61c

Subscribe to this mod's changes

firefox-relay-mcp AGENTS.md is an instructions file published in the GitHub repository nazar256/firefox-relay-mcp (0 stars, last pushed 2mo ago), licensed MIT. It adds 193 tokens to every session, about $0.0008 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

Backend and APIsCloudDevOps and cloudOAuthcloudflare-workersfirefox-relaymcpmodel-context-protocolpkce
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