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DimensionAsk Codex MCP ServerBridge Claude to the OpenAI Codex CLI for code review and a second opinion from another model.MartinLoop MCP ServerAn independent control layer that gives AI coding agents budgets, brakes, and receipts
FMRS52 / 100 · D79 / 100 · B
Reliability8 / 2012 / 20
Security and permissions11 / 2018 / 20
Maintenance10 / 2016 / 20
Documentation12 / 2018 / 20
Setup experience11 / 2015 / 20
Best for
  • Developers already using the OpenAI Codex CLI who want to reuse its quota
  • Teams that want cross-model second opinions inside Claude Code, Cursor, or similar assistants
  • Reasoning-heavy code reviews and architecture critique on specific files
  • Engineering teams scaling AI coding agents while controlling spend
  • Platform teams that need auditable, rollback-aware agent execution records
  • Organizations using multiple agents (Claude, Codex, Gemini) under one governed flow
Not for
  • Users without an OpenAI/Codex account or unable to install the Codex CLI
  • Anyone needing fully offline, zero-cost review (use the Ollama provider instead)
  • Users who need 1M+ token whole-codebase reads (use the Gemini or Antigravity provider)
  • Users expecting persisted per-session or cross-session usage accounting (usage stats are in-memory only)
  • Developers who just want a simple code-completion helper without run governance
  • Teams unwilling to accept local JSONL run records with HMAC signing
  • Environments without a supported adapter (Claude/Codex/Gemini CLIs, direct provider, or verifier-only)
Required permissions
  • Execute the Codex CLI locally and use network access to reach Codex services
  • Read the files being reviewed and send their contents to the Codex CLI as prompts
  • Write MCP server configuration into client config files/directories
  • Optionally read the GMCPT_TIMEOUT_MS and GMCPT_LOG_LEVEL environment variables
  • Read/write access to the configured repo root (writable scope restrictable via --allow-path/--deny-path)
  • Ability to invoke the chosen agent CLI (Claude/Codex/Gemini, etc.) and its underlying model account
  • Local disk writes for run records, receipts, and share outputs (share/run-receipt., etc.)
  • Execution of user-configured verifier commands (e.g. npm test)
Risks and side effects
  • Reviewed code is sent to the remote service behind the Codex CLI, which may conflict with data-egress policies
  • Codex CLI model and quota behavior is controlled upstream; documented defaults (gpt-6-astra → gpt-5.6-terra) can change
  • Omitting sessionId: "" on the first call yields a non-resumable one-shot session, which can be confusing
  • Unofficial third-party tool with no affiliation with or endorsement by Anthropic, OpenAI, or other vendors
  • Long reviews can exceed the default 5-minute timeout and be cut off
  • Verifier commands are executed; poorly chosen verifier commands carry security risk despite preflight policy checks
  • Cost and token figures may be estimates (labeled with provenance) and should not be treated as settled accounting
  • Receipt integrity must be verified before use as trustworthy evidence; missing rollback evidence is flagged as EVIDENCE_BOUNDARY
  • Policy defaults come from martin.config.yaml and can be overridden by CLI flags; misconfiguration can loosen safety boundaries
Supported clientsClaude Code, Cursor, Codex, Claude DesktopClaude Code, Codex, Gemini CLI, Cursor, VS Code, GitHub Copilot, Continue
Tools10