retro-reviewer

retro-reviewer is an agent for Claude Code from Necmttn/ax. It costs 79 tokens per session (1,166 once invoked), scanned A, original, AGPL-3.0.

A review agent that examines one earlier coding-agent session through ax’s shared turn record. It produces a structured review of what was tried, worked, failed, and should happen next.

In plain words
What is it for?
Use it to review a session, record follow-up proposals, and recommend improvements when the same patterns recur.
Why use it?
It makes lessons from past sessions easier to spot and can flag repeated patterns for possible process improvements.

Agent for Claude Code

Written for Claude Code: a Claude Code subagent (agents/*.md). Also seen: model in frontmatter.

Part of the ax plugin — 11 skills, 2 agents shipped together

Good fit Use it to review a session, record follow-up proposals, and recommend improvements when the same patterns recur.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/necmttn/ax/retro-reviewer
View source ↗ Necmttn/ax
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/Necmttn/ax

Made for: Claude Code.

Or install ax, the plugin that ships this one along with the rest of its 11 skills, 2 agents.

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 retro-reviewer

README.md
[![agentmods](https://agentmods.dev/badge/agents/necmttn/ax/retro-reviewer/github.svg)](https://agentmods.dev/agents/necmttn/ax/retro-reviewer)
Your own site
<a href="https://agentmods.dev/agents/necmttn/ax/retro-reviewer"><img src="https://agentmods.dev/badge/agents/necmttn/ax/retro-reviewer/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 retro-reviewer

Your own site · 80×15
<a href="https://agentmods.dev/agents/necmttn/ax/retro-reviewer"><img src="https://agentmods.dev/badge/agents/necmttn/ax/retro-reviewer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 79 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 1,166 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 unknown 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 $0.00079 $0.01166
Opus 5 $0.00039 $0.00583
Sonnet 5 $0.00016 $0.00233
Haiku 4.5 $0.00008 $0.00117

Measured 9d ago against content hash bc68508faf7e, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade A, and why

retro-reviewer 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 9d 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/retro-reviewer.md · 119 lines

The source is not reproduced here

Licensed AGPL-3.0

The repository is licensed AGPL-3.0, which this catalogue does not treat as permission to reproduce the file. Read it at the source.

Read it on GitHub

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. 9d ago First seen · 119 lines · 79 tokens per session scan A bc68508faf7e

Subscribe to this mod's changes

retro-reviewer is an agent published in the GitHub repository Necmttn/ax (105 stars, last pushed today), licensed AGPL-3.0. It adds 79 tokens to every session and 1,166 once invoked, about $0.0004 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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