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perfeval-agent SKILL.md skillA

perfeval-agent from stempeck/agentfactory is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.

Install it, pinned

mdr add stempeck/agentfactory/perfeval-agent@git:20261030.ce8639e

Pins git:20261030.ce8639e in mdr.lock. Pin the fingerprint instead.

Audit grade: A, 17 of 17 checks passed
Kind: SKILL.md skill
Repository: stempeck/agentfactory
Path: .claude/skills/perfeval-agent/SKILL.md
Versions recorded: 2
Latest version: git:20261030.ce8639e, committed Oct 30, 2026
First version recorded: Sep 16, 2026
Size: 20,625 bytes
Repository stars: 3
License: AGPL-3.0

Measures where one agentfactory agent's wall clock and tokens go (per formula step, child agent, in-step sub-agent, wake and fidelity-gate evaluation), ranks the cost centres, and names the one lever with the largest measured saving, its controller, and the query that proves it after a change. On request it applies a formula-controlled lever under the formula-edit rules. Use when the user says "/perfeval-agent <agent>", "why is <agent> slow", "where do the tokens go…

Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.

What the file says

# Evaluate Agent Performance

The deliverable is a **Verdict**: the cost centre with the largest measured saving, the mechanism
behind it, who controls it (formula, factory config or Go code), the script output every number
comes from, and the query that proves or disproves a change. Run every measurement yourself.

**Argument:** an agent name, or a formula file name (then use the agent whose `.formula` in
`af agents list --json` matches it).

## Setup

Run every command inside the factory environment (the container or host the agent runs in).
From another host, run each command through that environment's shell
(`docker exec -u <user> <container> bash -c 'cd <ROOT> && …'`). Never run `af` on a machine that
is not the factory, and never run `claude` inside the factory environment: a launch there can
purge the old session transcripts this skill measures.

The factory root is the bootstrapped project at `~/af/<project>`; every agent runs there and
every measurement comes from there. `~/projects/<agentfactory>` is the agentfactory source that
installs af and generates agents: it is not a factory root, so never measure, read config or
…

Read the whole file at its exact version.

How to install

The exact contents, by fingerprint

mdr add stempeck/agentfactory/perfeval-agent@sha256:b56c9c1a6a1b455a

The line at the top of this page pins the label git:20261030.ce8639e, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.

Badge

[![mdr](https://markdownregistry.com/badge/art_ayswvkevpx3apo3j.svg)](https://markdownregistry.com/a/art_ayswvkevpx3apo3j)

3 badge image fetches in 30 days. What the badge shows.

Versions

The registry has recorded 2 versions of this file, between Sep 16, 2026 and Oct 30, 2026, about one every 44 days.

version	committed	commit	size	audit
git:20261030.ce8639e latest	2026-10-30	ce8639e	20,625 B	A	view · diff
git:20260916.8d1a006	2026-09-16	8d1a006	10,666 B	A	view

Audit of the latest version

A 17 of 17 checks passed. Fixed automatic checks with no AI involved, so the same checks give the same answer every run.

pass: Frontmatter block present
pass: Frontmatter declares a name
pass: Frontmatter declares a description
pass: Size between 200 bytes and 200 KB (20625 bytes)
pass: No zero-width or bidi control characters
pass: No instruction hidden inside an HTML comment
pass: No link to an exfiltration or paste host
pass: No credential-shaped string
pass: No instruction to send local credentials anywhere
pass: No text hidden with inline styles
pass: No prompt-injection phrasing
pass: No curl or wget piped into a shell
pass: No recursive delete of root, home or parent
pass: No instruction to read or print local credentials
pass: No base64 blob over 200 characters
pass: No link to a raw IP address
pass: No script tag

Source

GitHub

stempeck/agentfactory · 3 stars · license AGPL-3.0 · pushed 2026-11-02 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_ayswvkevpx3apo3j
GET https://markdownregistry.com/api/v1/resolve?ref=stempeck/agentfactory/perfeval-agent
GET https://markdownregistry.com/api/v1/blob/b56c9c1a6a1b455a66db82950a1ef27a874dac21047da428cb491d4fb5d9d065

Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.

Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.