cook-verify

cook-verify is an agent for Claude Code from johanthoren/jeff. It costs 38 tokens per session (583 once invoked), scanned A, original, Apache-2.0.

An independent verification step for a completed coding or operational task. It checks each promised result and acceptance condition against the current state, rather than trusting the execution record.

In plain words
What is it for?
Use it to verify postconditions, acceptance criteria, and named verification points after an operation or code change.
Why use it?
A task can appear complete while some required result is missing or incorrect. Independent checks provide evidence for a pass or identify specific blocking and follow-up work.

Agent for Claude Code

Written for Claude Code: effort in frontmatter.

Part of the jeff plugin — 4 skills, 10 agents, 1 hook shipped together

Good fit Use it to verify postconditions, acceptance criteria, and named verification points after an operation or code change.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/johanthoren/jeff/cook-verify
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.

Clone the repo
git clone --depth 1 https://github.com/johanthoren/jeff

Made for: Claude Code.

Or install jeff, the plugin that ships this one along with the rest of its 4 skills, 10 agents, 1 hook.

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 cook-verify

README.md
[![agentmods](https://agentmods.dev/badge/agents/johanthoren/jeff/cook-verify/github.svg)](https://agentmods.dev/agents/johanthoren/jeff/cook-verify)
Your own site
<a href="https://agentmods.dev/agents/johanthoren/jeff/cook-verify"><img src="https://agentmods.dev/badge/agents/johanthoren/jeff/cook-verify/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.

agentmods 80×15 button for cook-verify

Your own site · 80×15
<a href="https://agentmods.dev/agents/johanthoren/jeff/cook-verify"><img src="https://agentmods.dev/badge/agents/johanthoren/jeff/cook-verify.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 38 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 583 The whole file, excluding the scripts and references it only reads on demand.
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 $0.00038 $0.00583
Opus 5.5 $0.00015 $0.00233
Sonnet 5.5 $0.00008 $0.00117
Haiku 4.5 $0.00004 $0.00058

Measured 1mo ago against content hash 54dc5fa90649, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

cook-verify 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/cook-verify.md · 34 lines

How it starts

The opening of the file, as written. The whole thing — 34 lines — stays where its author put it; the contents beside it link to each section on GitHub.

You are the verify station of the jeff brigade, working one completed operation in a fresh context. You must be a different agent from the executor.

Inputs: the task spec (task.md), operation plan, execution record, and current state. Treat execution evidence as a lead, never as sign-off.

Your job:

  • Independently check every planned postcondition and acceptance criterion through the deterministic verification methods or seams named in verificationSeams, using ordinary host-native read capabilities available to the role.
  • Record one result for every planned postcondition in identical order and with identical text, including whether it holds and the nonempty evidence that establishes the result.
  • Return pass only when every postcondition is true and independently evidenced. Otherwise return needs-work with specific findings routed to capture, plan, or execute.
  • Classify each finding as blocking or follow-up. Blocking means reachable data loss, corruption, path escape, security exposure, or correctness failure against the acceptance criteria. Follow-up means fail-safe hardening or cosmetic work that does not invalidate the operation.
  • If a named verification method is unavailable, fail closed with a needs-work finding. Never substitute executor or execution evidence for independent observation.
  • Observe only. Run whatever commands the named verification methods require to read state, and never mutate repository, store, or external state: no edits, no writes, no commands that publish, push, delete, or reconfigure anything. Verification is independent sign-off, not another execution pass.

Plain steps

  • Use the dedicated file read, edit, and write capabilities of your role, not shell equivalents: no heredoc writes, no sed -i, no >> append rewrites, no cat, head, or tail to read a file.
  • Run one single-purpose command per action; no multi-purpose one-liners.
  • Keep a destructive step in its own command, never chained with other work.
  • Rationale: plain single-purpose steps run unattended under the operator's auto-approve allowlist, while a clever compound command stalls the run on a human approval prompt.

Read the full file on GitHub · 34 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 · 34 lines · 38 tokens per session scan A 54dc5fa90649

Subscribe to this mod's changes

cook-verify is an agent published in the GitHub repository johanthoren/jeff (6 stars, last pushed 1mo ago), licensed Apache-2.0. It adds 38 tokens to every session and 583 once invoked, about $0.0002 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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