Borrowing it
Nothing to install: this file belongs to ventusff/claude-model-guard. 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/ventusff/claude-model-guard/main/AGENTS.mdgit clone --depth 1 https://github.com/ventusff/claude-model-guardWrote 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/ventusff/claude-model-guard/agents-md)<a href="https://agentmods.dev/instructions/ventusff/claude-model-guard/agents-md"><img src="https://agentmods.dev/badge/instructions/ventusff/claude-model-guard/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/ventusff/claude-model-guard/agents-md"><img src="https://agentmods.dev/badge/instructions/ventusff/claude-model-guard/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 | $0.02162 | $0.02162 |
| Opus 5.5 | $0.00865 | $0.00865 |
| Sonnet 5.5 | $0.00432 | $0.00432 |
| Haiku 4.5 | $0.00216 | $0.00216 |
Grade A, and why
claude-model-guard AGENTS.md scanned grade A with 1 finding 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.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
Requirements: bash 4+, jq and curl; the recovery path also uses `flock` and `setsid`. There is no CI workflow — `tests/run.sh` on the machine is the bar. Hooks load at session start, so a change under `hooks/` or `script How it starts
The opening of the file, as written. The whole thing — 55 lines — stays where its author put it; the contents beside it link to each section on GitHub.
AGENTS.md — claude-model-guard
A Claude Code plugin (model-guard, distributed from this repo as marketplace claude-model-guard): a full-width statusline band that flags a silent model downgrade, plus hooks that undo a safeguard-flag downgrade — stop the turn, type /model and /effort into the session's own terminal (tmux, zellij or kitty), resume the task. Pure bash + jq, no build step, no daemon. Installed via /plugin marketplace add ventusff/claude-model-guard, so main on GitHub is what every install fetches.
The Codex integration lives independently under codex/model-guard/: a valid Codex plugin and Python package, with a pinned native Codex build with metadata events and conditional footer warnings; the Python app-server adapter is used only by the explicit standalone probe. See its ROUTING.md for evidence boundaries and primary sources. It monitors disclosed routing and does not perform automatic model recovery.
Layout
| Path | What |
|---|---|
.claude-plugin/plugin.json |
Plugin manifest: name, version, description, keywords. |
.claude-plugin/marketplace.json |
The marketplace this repo is; lists the one plugin with source: ./. |
hooks/hooks.json |
Registers scripts/guard-hook.sh on SessionStart, SessionEnd, PreModelSwitch, PostModelSwitch, PreToolUse, Stop, UserPromptSubmit; check-install.sh on SessionStart. |
scripts/statusline.sh |
The statusline. Sources lib.sh next to it. setup copies the three scripts to ~/.claude/model-guard/; that copy is what Claude Code runs. Asks Claude Code's usage endpoint for the logged-in account's rate-limit usage, cached in usage.json under the state dir. |
scripts/lib.sh |
Shared helpers (mg_*): config, language, model strength ranking, saved effort, per-session state, keystroke channels. Sourced by the statusline, the hook and the driver. Holds MG_VERSION. |
scripts/text.sh |
Every user-facing string in the eight band languages (mg_text). Sourced by lib.sh. |
scripts/guard-hook.sh |
The one hook command; dispatches on hook_event_name, answers with hook JSON. |
scripts/recover.sh |
The detached driver that types Esc, /model, /effort, continue prompt into the terminal. |
scripts/check-install.sh |
SessionStart: hints until setup is done; refreshes the installed scripts when the plugin ships a newer MG_VERSION; turns a registered flat ~/.claude/model-guard.sh into a hand-off to the directory. |
skills/setup/SKILL.md, skills/remove/SKILL.md |
/model-guard:setup and /model-guard:remove — step lists the agent follows, not shell scripts. |
tests/run.sh |
The test suite: synthetic hook payloads, dryrun channel, fake tmux/zellij binaries, isolated state, config and install dir. |
README.md, README.zh-CN.md, CHANGELOG.md |
User docs in both languages, and the release log. |
assets/ |
The README's hero and setup SVGs. |
codex/model-guard/model_guard/ |
Codex probe metadata (state.py, reasoning.py, check.py, relay.py), running-session discovery (sessions.py), native installer and diagnostics. |
codex/model-guard/tests/ |
Python unit tests and opt-in real Codex/HTTP/WebSocket/PTY fixtures. |
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 · +25 tokens per session 711b8b02fa3d
- 1mo ago Changed · +14 lines · +889 tokens per session 2b5d8f17ae5b
- 1mo ago Changed · +70 tokens per session 8473c0d9b42d
- 1mo ago First seen · 41 lines · 1,178 tokens per session scan A 19d752191c2b
claude-model-guard AGENTS.md is an instructions file published in the GitHub repository ventusff/claude-model-guard (2 stars, last pushed 1mo ago), licensed MIT. It adds 2,162 tokens to every session, about $0.0086 per session on Opus 5.5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-07.
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.