rulesmith: Instructions file for Codex

AGENTS.md

rulesmith AGENTS.md is an instructions file for Codex, OpenCode from CsabaKovacs/rulesmith. It costs 1,879 tokens per session, scanned A, original, Apache-2.0.

A repository rulebook for the rulesmith project, stored as AGENTS.md instructions. It records coding conventions, setup commands, project structure, and evidence for its rules.

In plain words
What is it for?
Following the project's conventions, setup and execution rules while working on its TypeScript monorepo and related packages.
Why use it?
It gives coding agents clear project-specific guidance instead of making them rely on generic assumptions. It also keeps changes small and tied to facts found in the repository.

Instructions file for CodexOpenCode

Written for Codex and OpenCode: the file is AGENTS.md. Also seen: mentions subagents.

This is CsabaKovacs/rulesmith's own configuration. It tells Codex and OpenCode how to work on rulesmith 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 rulesmith configures →

Reuse

Borrowing it

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

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.

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README.md
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Your own site
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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.

agentmods 80×15 button for rulesmith AGENTS.md

Your own site · 80×15
<a href="https://agentmods.dev/instructions/csabakovacs/rulesmith/agents-md"><img src="https://agentmods.dev/badge/instructions/csabakovacs/rulesmith/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 1,879 This file is loaded in full into every session.
When invoked 1,879 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 $0.01879 $0.01879
Opus 5.5 $0.00752 $0.00752
Sonnet 5.5 $0.00376 $0.00376
Haiku 4.5 $0.00188 $0.00188

Measured 1mo ago against content hash 645eb8499ea3, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

rulesmith 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 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.

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 · 129 lines

How it starts

The opening of the file, as written. The whole thing — 129 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Project Conventions (Evidence-Backed)

Execution Contract

  • BINDING: This rulebook is mandatory. Every rule, convention, and workflow defined here MUST be followed without exception. Skipping, ignoring, or partially applying rules is a violation. If a rule conflicts with your default behavior, the rulebook takes precedence.
  • Use evidence-first behavior: every non-trivial claim or new convention must stay tied to concrete repository evidence.
  • Enforce repository conventions first; do not replace a strong local pattern with generic best-practice text.
  • Keep changes reviewable and scoped: prefer the smallest behavior-safe diff that fits the touched boundary.
  • strictness: very-strict
  • standards: project-plus-standard

Project Snapshot

  • What: rulesmith — local-first CLI + MCP server for evidence-backed AI coding instruction generation. (evidence: package.json)
  • Stack: TypeScript monorepo managed by pnpm with 3 workspace packages. (evidence: pnpm-workspace.yaml, tsconfig.base.json)
  • Packages:
    • packages/core — scanner, evidence bundler, rulebook builder, AST analysis, template renderer, decision tree engine, pack system, safe FS utilities. (evidence: packages/core/src/index.ts)
    • packages/cli — Commander-based CLI wrapping core functions. (evidence: packages/cli/src/index.ts)
    • packages/mcp — MCP server wrapping core functions via @modelcontextprotocol/sdk. (evidence: packages/mcp/src/server.ts)
  • Key directories:
    • packs/default/ — Handlebars templates + decision tree YAML + orchestrator prompts. (evidence: packs/default/pack.json)
    • examples/fixtures/ — Test fixture repos. Test data, NOT production code. (evidence: examples/fixtures/)
  • Build command coverage: install=yes, build=yes, test=yes, lint=yes. (evidence: package.json)

Setup Commands (with evidence)

  • install: pnpm install
  • build: pnpm -r build
  • test: pnpm -r test
  • lint: pnpm -r lint
  • format: UNKNOWN
  • dev: UNKNOWN

Evidence: package.json, pnpm-workspace.yaml

Read the full file on GitHub · 129 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. 1mo ago First seen · 129 lines · 1,879 tokens per session scan A 645eb8499ea3

Subscribe to this mod's changes

rulesmith AGENTS.md is an instructions file published in the GitHub repository CsabaKovacs/rulesmith (15 stars, last pushed 6mo ago), licensed Apache-2.0. It adds 1,879 tokens to every session, about $0.0075 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.

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