Borrowing it
Nothing to install: this file belongs to zoeynine/Local-Codex-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.
curl -O https://raw.githubusercontent.com/zoeynine/Local-Codex-Bridge/main/AGENTS.mdgit clone --depth 1 https://github.com/zoeynine/Local-Codex-BridgeWrote 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.
[](https://agentmods.dev/instructions/zoeynine/local-codex-bridge/agents-md)<a href="https://agentmods.dev/instructions/zoeynine/local-codex-bridge/agents-md"><img src="https://agentmods.dev/badge/instructions/zoeynine/local-codex-bridge/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.
<a href="https://agentmods.dev/instructions/zoeynine/local-codex-bridge/agents-md"><img src="https://agentmods.dev/badge/instructions/zoeynine/local-codex-bridge/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.03588 | $0.03588 |
| Opus 5.5 | $0.01435 | $0.01435 |
| Sonnet 5.5 | $0.00718 | $0.00718 |
| Haiku 4.5 | $0.00359 | $0.00359 |
Grade A, and why
Local-Codex-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 27d 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.
How it starts
The opening of the file, as written. The whole thing — 401 lines — stays where its author put it; the contents beside it link to each section on GitHub.
AI Agent Guidance
Release contract: V2.3.4
This file is guidance for AI agents working on Local Codex Bridge. It is not a product overview and should not be treated as a substitute for the source, tests, or protocol qualification notes.
Read the current repository state before acting. Prefer current source and tests over remembered behavior, old issue context, or assumptions about Codex internals.
Project intent
Local Codex Bridge is a thin MCP stdio supervisory surface for native Codex, with one shared Windows/macOS core and optional platform-specific integration layers.
Its purpose is to let ChatGPT or another MCP client supervise native Codex work without creating a second task system, history store, queue, retry loop, semantic index, model registry, or lifecycle authority.
Keep the Bridge thin.
Native Codex owns persistent threads, turns, execution, history, Goal, Queue, Search, model state, sandbox behavior, and approval behavior. Bridge-owned state is limited to bounded live supervision state, pending requests, terminal snapshots, optional bounded checkpoints, and narrow compatibility / UX projection where explicitly implemented.
Do not solve an upstream capability gap by casually inventing a parallel Bridge subsystem.
Runtime architecture
The core chain is:
MCP client
-> Local Codex Bridge (MCP JSON-RPC over stdio)
-> official `codex app-server --listen stdio://` (JSONL stdio)
-> native Codex threads / turns
Primary ownership in the repository:
src/mcp.ts— MCP transport boundary and result framingsrc/app-server.ts— official Codex app-server child process and protocol requestssrc/tools.ts— public MCP tool schema and supervisory contractsrc/runtime.ts— bounded ephemeral live state, pending requests, terminal snapshotssrc/observe-compact.ts— compact typed supervision projectionsrc/history.ts— lossless History delivery checkssrc/goal.ts— Native Goal validation / deliverysrc/queue.ts— Native Queue validation / deliverysrc/search.ts— Native Search validation / deliverysrc/checkpoint.ts— optional bounded supervisor checkpointsrc/platform.ts— Windows/macOS platform boundarysrc/version.ts— canonical Bridge versionPROTOCOL-ASSUMPTIONS.md— version-sensitive upstream contract and revalidation notes
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.
- 27d ago Changed · +2 lines · +50 tokens per session c1f46b08d306
- 28d ago Changed · +332 lines · +2,408 tokens per session 4ea1df1e5c47
- 1mo ago First seen · 67 lines · 1,130 tokens per session scan A 234aa78fd8ea
Local-Codex-Bridge AGENTS.md is an instructions file published in the GitHub repository zoeynine/Local-Codex-Bridge (41 stars, last pushed 9d ago), licensed MIT. It adds 3,588 tokens to every session, about $0.0144 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 2026-08-30.
Other instructions, from other repositories
vscode buildNext.instructions.md
Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).
next.js AGENTS.md
AGENTS.md instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.
vscode oss-third-party-notices.instructions.md
Instructions for microsoft/vscode, covering vs code oss third-party-notices pipeline, architecture, pipeline flow in ci, cache eligibility and rollout and applying the notice (cutover).
langchain AGENTS.md
AGENTS.md instructions for langchain-ai/langchain, covering global development guidelines for the langchain monorepo, corridor security analysis, project architecture and context, monorepo structure and development tools & commands.
vscode copilot-instructions.md
Copilot instructions for microsoft/vscode, covering vs code copilot instructions, project overview, root folders, core architecture (src/ folder) and built-in extensions (extensions/ folder).
deno copilot-instructions.md
Copilot instructions for denoland/deno, covering deno development guide for github copilot, network access, high level overview, key directories and key files to understand first.