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rails-ai-bridge: Instructions file for Codex

AGENTS.md

rails-ai-bridge AGENTS.md is an instructions file for Codex, OpenCode from igmarin/rails-ai-bridge. It costs 1,409 tokens per session, scanned A, original, MIT.

Development instructions for iwdp-mcp, a Go service that connects coding tools to web pages running in an iOS simulator.

In plain words
What is it for?
Use them when developing or testing the service, its command-line tool, or its routing between simulator targets.
Why use it?
They collect the build, test, formatting, linting, and simulator setup commands needed to check changes correctly.

Instructions file for CodexOpenCode

Written for Codex and OpenCode: the file is AGENTS.md. Also seen: mentions AGENTS.md; mentions Codex.

This is igmarin/rails-ai-bridge's own configuration. It tells Codex and OpenCode how to work on rails-ai-bridge 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 rails-ai-bridge configures →

Needs its repository: it reads a path above its own folder, which exists only inside the repository. The line is git worktree add ../project-worktrees/group-a -b group-a-branch.

not rated 14repo 9d ago A scan 1,409 tokens original MIT
View source ↗ igmarin/rails-ai-bridge
Reuse

Borrowing it

Nothing to install: this file belongs to igmarin/rails-ai-bridge. 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/igmarin/rails-ai-bridge/main/AGENTS.md
Clone the repo
git clone --depth 1 https://github.com/igmarin/rails-ai-bridge

Made for: Codex, OpenCode.

Wrote this? Show the measurements

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README.md
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Per session 1,409 This file is loaded in full into every session.
When invoked 1,409 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 $0.01409 $0.01409
Opus 5 $0.00705 $0.00705
Sonnet 5 $0.00282 $0.00282
Haiku 4.5 $0.00141 $0.00141

Measured 8d ago against content hash dc408916431a, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade A, and why

rails-ai-bridge 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 8d 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.

Origin

Copies of this mod

2 near-identical copies found in the catalogue:

AGENTS.md · 95 lines

How it starts

The opening of the file, as written. The whole thing — 95 lines — stays where its author put it; the contents beside it link to each section on GitHub.

AGENTS.md — rails-ai-bridge development guide

Ruby gem that reads a Rails app and gives assistants that map over MCP and committed context files. It does not write to the host database.

Architecture

  • lib/rails_ai_bridge.rb — Main entry point, public API (Zeitwerk autoloaded)
  • lib/rails_ai_bridge/configuration.rb — User-facing config with presets (:standard, :full)
  • lib/rails_ai_bridge/introspector.rb — Orchestrates sub-introspectors
  • lib/rails_ai_bridge/introspectors/ — Built-in introspector classes; :standard preset runs 9, :full runs 27 (see Configuration::PRESETS). Registry: Introspector::BUILTIN_INTROSPECTORS (includes opt-in symbols such as database_stats, non_ar_models not listed in those presets).
  • lib/rails_ai_bridge/tools/ — 20 built-in MCP tools using the official mcp SDK (hosts can add more via additional_tools)
  • lib/rails_ai_bridge/serializers/ — Output formatters (claude, claude_rules, codex, cursor_rules, devin, devin_rules, copilot, copilot_instructions, gemini, rules, markdown, JSON)
  • lib/rails_ai_bridge/resources.rb — MCP resources (static data AI clients read directly)
  • lib/rails_ai_bridge/server.rb — MCP server configuration (stdio + HTTP transports)
  • lib/rails_ai_bridge/middleware.rb — Rack middleware for auto-mounting MCP HTTP endpoint
  • lib/rails_ai_bridge/fingerprinter.rb — SHA256 file fingerprinting for cache invalidation
  • lib/rails_ai_bridge/doctor.rb — Diagnostic checks and AI readiness scoring
  • lib/rails_ai_bridge/watcher.rb — File watcher for auto-regenerating context files
  • lib/rails_ai_bridge/engine.rb — Rails Engine for auto-integration
  • lib/rails_ai_bridge/registry/ — Outbound context provider stack: EndpointPolicy (SSRF allowlist), ContextProviderClient (MCP SDK HTTP client), ContextAggregator (fetch/map/limit), ProviderRequestScope (per-call memoization), MessageSanitizer (credential redaction)
  • lib/rails_ai_bridge/config/context_providers.rb — Provider configuration (enabled, allowed_hosts, timeout, limits, auth_resolver)
  • lib/generators/rails_ai_bridge/install/ — Install generator (creates .mcp.json, initializer, context files)

Read the full file on GitHub · 95 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. 8d ago First seen · 95 lines · 1,409 tokens per session scan A dc408916431a

Subscribe to this mod's changes

rails-ai-bridge AGENTS.md is an instructions file published in the GitHub repository igmarin/rails-ai-bridge (14 stars, last pushed 9d ago), licensed MIT. It adds 1,409 tokens to every session, about $0.0070 per session on Opus 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 2026-08-30.

Browser automationMobilerails-airails-ai-assisted-development
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