bibtools: Instructions file for Codex

AGENTS.md

bibtools AGENTS.md is an instructions file for Codex, OpenCode from mathpluscode/bibtools. It costs 706 tokens per session, scanned A, original, MIT.

Repository-specific instructions for bibtools, a bibliography toolkit for LaTeX, the document system commonly used for technical and academic writing. It includes guidance for code changes, reviews, documentation, and its `bibtidy` skill.

In plain words
What is it for?
It is for changing or reviewing bibtools and for cleaning `.bib` bibliography files with the `bibtidy` skill.
Why use it?
It helps an agent follow the repository’s contribution rules and focus on real, reproducible problems instead of speculative fixes.

Instructions file for CodexOpenCode

Written for Codex and OpenCode: the file is AGENTS.md. Also seen: reads .claude/ paths; mentions .claude-plugin; mentions subagents.

This is mathpluscode/bibtools's own configuration. It tells Codex and OpenCode how to work on bibtools itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything bibtools configures →

Reuse

Borrowing it

Nothing to install: this file belongs to mathpluscode/bibtools. 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/mathpluscode/bibtools/main/AGENTS.md
Clone the repo
git clone --depth 1 https://github.com/mathpluscode/bibtools

Made for: Codex, OpenCode.

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.

agentmods badge for bibtools AGENTS.md

README.md
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Your own site
<a href="https://agentmods.dev/instructions/mathpluscode/bibtools/agents-md"><img src="https://agentmods.dev/badge/instructions/mathpluscode/bibtools/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.

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Per session 706 This file is loaded in full into every session.
When invoked 706 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 original No closer match found 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00706 $0.00706
Opus 5.5 $0.00282 $0.00282
Sonnet 5.5 $0.00141 $0.00141
Haiku 4.5 $0.00071 $0.00071

Measured 2mo ago against content hash 2795db9c08d8, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

bibtools 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 2mo 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.

AGENTS.md · 51 lines

How it starts

The opening of the file, as written. The whole thing — 51 lines — stays where its author put it; the contents beside it link to each section on GitHub.

bibtools

A bibliography toolkit for LaTeX, built as agent skills. Explore the repo to understand the project structure before making changes.

General principles

Bias toward action. Do not spend excessive time exploring files or asking clarifying questions when the task is clear. Start implementing and iterate.

Code changes

  • When fixing bugs or implementing changes, do NOT fix things that aren't actually broken. If you're unsure whether something is a real bug, ask before implementing a fix. Never apply fixes for theoretical issues that can't occur in practice given the actual workflow.
  • When making changes, always check README.md and other documentation files for references that need updating. Check for hardcoded magic numbers that should use existing config values.

Code review

When asked to do a code review, only flag real actionable issues. Do NOT over-engineer fixes or apply unnecessary changes. When in doubt, propose the fix and wait for user approval before implementing.

How it works

bibtidy

In Claude Code, invoke with /bibtidy refs.bib. In Codex, ask it to use the bibtidy skill on a .bib file. The agent reads the file, dispatches parallel subagents to verify entries against Google Scholar and CrossRef (bundled crossref.py), then applies fixes sequentially with targeted edits. Every change includes the original entry commented out and one or more source URLs for verification.

Versioning

Version is tracked in three files (.claude-plugin/marketplace.json, .claude-plugin/plugin.json, pyproject.toml). Update all three, then run uv lock to sync uv.lock.

Development

The skill's tools live under skills/bibtidy/tools/ in this repo. At runtime, determine which agent platform you are (Claude Code, Codex, etc.) and resolve the installed tools directory accordingly (e.g. ~/.claude/skills/bibtidy/tools for Claude Code, ~/.codex/skills/bibtidy/tools for Codex). To test local changes:

  • Run ./tests/run_bibtidy_cc_tests.sh — this syncs local tools to ~/.claude/skills/bibtidy/ before invoking Claude
  • Run ./tests/run_bibtidy_codex_tests.sh for the Codex end-to-end path
  • Unit tests only: uv run pytest tests/

Read the full file on GitHub · 51 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.

  1. 2mo ago First seen · 51 lines · 706 tokens per session scan A 2795db9c08d8

Subscribe to this mod's changes

bibtools AGENTS.md is an instructions file published in the GitHub repository mathpluscode/bibtools (6 stars, last pushed 6mo ago), licensed MIT. It adds 706 tokens to every session, about $0.0028 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 2026-08-31.

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