What is rails-ai-bridge CLAUDE.md?

A development guide for a Ruby gem that examines a Ruby on Rails application and gives AI assistants a map of its code and other committed context. It uses MCP, a standard way for AI tools to access structured information.

Use it when developing, configuring, or extending rails-ai-bridge, including its application inspectors, MCP tools, resources, and assistant-specific formats.

It helps assistants understand a Rails application's structure and conventions without changing the host database. It also documents the project's architecture, testing approach, and output formats.

How igmarin/rails-ai-bridge configures Claude Code

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/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/igmarin/rails-ai-bridge

Made for: Claude Code.

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.

README.md

[![agentmods](https://agentmods.dev/badge/instructions/igmarin/rails-ai-bridge/claude-md/github.svg)](https://agentmods.dev/instructions/igmarin/rails-ai-bridge/claude-md)

Your own site

<a href="https://agentmods.dev/instructions/igmarin/rails-ai-bridge/claude-md"><img src="https://agentmods.dev/badge/instructions/igmarin/rails-ai-bridge/claude-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.

Your own site · 80×15

<a href="https://agentmods.dev/instructions/igmarin/rails-ai-bridge/claude-md"><img src="https://agentmods.dev/badge/instructions/igmarin/rails-ai-bridge/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 1,114 This file is loaded in full into every session.

When invoked 1,114 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 91% copy Near-identical to another mod 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.

Model	Per session	Once invoked
Fable 5.1	$0.01114	$0.01114
Opus 5.5	$0.00446	$0.00446
Sonnet 5.5	$0.00223	$0.00223
Haiku 4.5	$0.00111	$0.00111

Measured 1mo ago against content hash 86267e74863a, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

rails-ai-bridge CLAUDE.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 1mo 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

This is a copy

91% identical to rails-ai-bridge AGENTS.md — 55 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

CLAUDE.md · 66 lines

How it starts

The opening of the file, as written. The whole thing — 66 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CLAUDE.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 (:full already includes non_ar_models; opt-in-only symbols not in any preset: database_stats, semantic).
lib/rails_ai_bridge/tools/ — 22 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 · 66 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.

1mo ago Changed · +1 lines · +49 tokens per session 86267e74863a
2mo ago First seen · 65 lines · 1,065 tokens per session scan A aed64c3c21c4

Subscribe to this mod's changes

rails-ai-bridge CLAUDE.md is an instructions file published in the GitHub repository igmarin/rails-ai-bridge (16 stars, last pushed 13d ago), licensed MIT. It adds 1,114 tokens to every session, about $0.0045 per session on Opus 5.5. A static security scan graded it A with 0 findings. It is 91% identical to rails-ai-bridge AGENTS.md, differing in 55 lines, and is treated as a copy.

Backend and APIs Building agents rails-ai rails-ai-assisted-development

rails-ai-bridge CLAUDE.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
rails-ai-bridge CLAUDE.mdigmarin/rails-ai-bridge	Instructions file	16	13d ago	MIT	A	1,114	Claude Code
vscode buildNext.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	9,719	GitHub Copilot
next.js AGENTS.mdvercel/next.js	Instructions file	143k	today	MIT	A	7,461	Codex, OpenCode
langchain AGENTS.mdlangchain-ai/langchain	Instructions file	149k	yesterday	MIT	A	4,680	Codex, OpenCode
vscode oss-third-party-notices.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	5,516	GitHub Copilot
vscode copilot-instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	3,093	GitHub Copilot
deepseek-harness AGENTS.mddeepseek-ai/deepseek-harness	Instructions file	274k	2d ago	MIT	A	4,313	Codex, OpenCode

rails-ai-bridge: Instructions file for Claude Code