Borrowing it
Nothing to install: this file belongs to cruxible-ai/cruxible. 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/cruxible-ai/cruxible/main/AGENTS.mdgit clone --depth 1 https://github.com/cruxible-ai/cruxibleWrote 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/cruxible-ai/cruxible/agents-md)<a href="https://agentmods.dev/instructions/cruxible-ai/cruxible/agents-md"><img src="https://agentmods.dev/badge/instructions/cruxible-ai/cruxible/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/cruxible-ai/cruxible/agents-md"><img src="https://agentmods.dev/badge/instructions/cruxible-ai/cruxible/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 | $0.02555 | $0.02555 |
| Opus 5 | $0.01277 | $0.01277 |
| Sonnet 5 | $0.00511 | $0.00511 |
| Haiku 4.5 | $0.00255 | $0.00255 |
Grade A, and why
cruxible 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 11d 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 — 212 lines — stays where its author put it; the contents beside it link to each section on GitHub.
AGENTS.md
This file provides guidance to Codex (Codex.ai/code) when working with code in this repository.
Project Overview
GitHub: https://github.com/cruxible-ai/cruxible
Cruxible Core is a deterministic decision engine with receipts. AI agents (Codex, etc.) write configs and orchestrate workflows. Core executes deterministically with proof — no LLM inside.
Four primitives: Config, Ingest, Query, Feedback.
Commands
# Install dependencies
uv sync --all-extras
# Run tests
uv run pytest
# Run Docker image tests (requires Docker)
CRUXIBLE_RUN_DOCKER_TESTS=1 uv run pytest tests/test_image -m docker
# Run single test file
uv run pytest tests/test_config/test_schema.py -v
# Lint
uv run ruff check src tests
# Format
uv run ruff format src tests
# Type check
uv run mypy src
Git Conventions
- Do NOT include
Co-Authored-Bylines in commit messages. - When implementing multi-fix plans, commit each logical fix as it's completed (source + tests together). Don't defer all commits to the end — partial staging across shared files is error-prone. After all commits, prepare a review guide covering the full set.
Review Request Conventions
- For code-change ReviewRequests in the agent-operation kit, include structured
change_repo,change_base, andchange_headfields.change_headis the exact reviewed commit SHA; reviewers and merge tooling should not infer it from the branch tip. - Keep
ReviewRequest.summaryimplementer-owned: scope, verification evidence, known failures, and review context. Reviewers should put requested changes and approval notes inReviewRequest.review_notes.
Versioning
Version lives in two places — keep them in sync:
pyproject.toml(version = "X.Y.Z")src/cruxible_core/__init__.py(__version__ = "X.Y.Z")
The MCP server name includes the version (cruxible-core v0.2.0) so agents and users can confirm which build is running.
When to bump:
- Patch (0.2.x): Bug fixes, doc/prompt wording changes, test additions
- Minor (0.x.0): New features (tools, evaluate checks, config capabilities), breaking prompt changes
- Major (x.0.0): Breaking API changes (tool signatures, config schema, storage format)
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.
- 11d ago First seen · 212 lines · 2,555 tokens per session scan A 8be4d004ae78
cruxible AGENTS.md is an instructions file published in the GitHub repository cruxible-ai/cruxible (17 stars, last pushed 2d ago), licensed Apache-2.0. It adds 2,555 tokens to every session, about $0.0128 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.
Other instructions, from other repositories
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.
codex AGENTS.md
AGENTS.md instructions for openai/codex, covering rust/codex-rs, the codex-core crate, code review rules, crate api surface and model visible context.
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).
spec-kit AGENTS.md
AGENTS.md instructions for github/spec-kit, covering agents.md, about spec kit and specify, quickstart — add a new integration in 5 steps, integration architecture and integrationmanifest — file tracking.
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 oss-third-party-notices.instructions.md
Instructions for microsoft/vscode, covering vs code oss third-party-notices pipeline, architecture, pipeline flow in ci, applying the notice (cutover) and fallback chain (never fail the build).