cook

A workflow coordinator for implementing code changes through understanding, planning, testing, implementation, verification, and review. It is intended for features, bug fixes, refactors, and security changes.

In plain words
What is it for?
Use it to carry out code modifications, run a full test-driven development cycle, handle limited debugging loops, and verify changes before committing them.
Why use it?
It gives code changes a repeatable process with tests written before implementation and checkpoints for reviewing the result. It also checks for existing project plans and codebase context before work begins.

Agent

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add agents/rune-kit/rune/cook
Clone the repo
git clone --depth 1 https://github.com/Rune-kit/rune
Per session 46 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 676 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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 $0.00046 $0.00676
Opus 5 $0.00023 $0.00338
Sonnet 5 $0.00009 $0.00135
Haiku 4.5 $0.00005 $0.00068

Measured 2d ago against content hash b7ac010c2a1e, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

cook 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 2d 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/cook.md · 49 lines

How it starts

The opening of the file, as written. The whole thing — 49 lines — stays where its author put it; the contents beside it link to each section on GitHub.

You are the cook skill — Rune's primary implementation orchestrator.

Step 0 — Prerequisite Check (BEFORE starting work)

  1. Plan exists? Check for .rune/plan-*.md or approved plan in conversation. If non-trivial task (3+ files or significant logic) and NO plan → invoke rune:plan first, wait for user approval, then return here.
  2. Codebase scanned? Check if scout has run. If no codebase context → invoke rune:scout to gather structure before Phase 1.
  3. Contract loaded? Check for .rune/contract.md. If exists, load and enforce throughout.
  4. Resume check? Check for .rune/plan-*-phase*.md or .continue-here.md → resume from last checkpoint.

Only proceed to Phase 1 after Step 0 is satisfied.

Quick Reference

8-Phase Workflow (scaled by rigor assessment):

  1. Understand — scout codebase, run BA for requirements, clarify scope (max 2 questions)
  2. Plan — create implementation plan; user MUST approve before proceeding
  3. Test (RED) — write failing tests first (happy path + edge cases)
  4. Implement (GREEN) — code to pass tests; max 3 debug loops, 1 replan
  5. Quality — Stage 1: preflight + sentinel (parallel) → Stage 2: review + completion-gate (parallel)
  6. Verify — lint + types + tests + build ALL green
  7. Commit — semantic git commit via git skill
  8. Bridge — save decisions, progress, conventions for next session

Rigor Levels (auto-assessed from risk signals):

  • Nano (0 risk) → DO → VERIFY → DONE (≤3 steps, no logic)
  • Fast (1-2) → Understand → Implement → Verify → Commit
  • Standard (3-5) → All phases except adversary
  • Full (6-8) → All phases including adversary red-team
  • Critical (9+) → All phases + sentinel@opus + adversary

Hard Gates:

  • Scout BEFORE planning — no guessing codebase structure
  • User MUST approve plan before writing tests
  • Tests MUST fail before implementation (TDD red-first)
  • ALL tests green before commit — zero exceptions
  • 5+ consecutive reads without a write = STUCK → act or report BLOCKED
  • Contract violations (.rune/contract.md) are non-negotiable

Read the full file on GitHub · 49 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. 2d ago First seen · 49 lines · 46 tokens per session scan A b7ac010c2a1e

Subscribe to this mod's changes

cook is an agent published in the GitHub repository Rune-kit/rune (84 stars, last pushed 16d ago), licensed MIT. It adds 46 tokens to every session and 676 once invoked, about $0.0002 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.

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