What is retro AGENTS.md?

Project-specific instructions for retro, an error and success logging service with an MCP server. They document its tests, code structure, SQLite database layout, and how to keep a plugin copy in sync.

Use them when changing retro's database code or MCP server, running its test suite, handling schema migrations, or syncing the updated database script to the Claude plugin cache.

They help coding agents run the right tests, understand where changes belong, and avoid updating the source code without updating the copy used by the plugin.

How rubin-johnson/retro configures Codex and OpenCode

Reuse

Borrowing it

Nothing to install: this file belongs to rubin-johnson/retro. 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/rubin-johnson/retro/main/AGENTS.md

Clone the repo

git clone --depth 1 https://github.com/rubin-johnson/retro

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.

README.md

[![agentmods](https://agentmods.dev/badge/instructions/rubin-johnson/retro/agents-md/github.svg)](https://agentmods.dev/instructions/rubin-johnson/retro/agents-md)

Your own site

<a href="https://agentmods.dev/instructions/rubin-johnson/retro/agents-md"><img src="https://agentmods.dev/badge/instructions/rubin-johnson/retro/agents-md/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.

Your own site · 80×15

<a href="https://agentmods.dev/instructions/rubin-johnson/retro/agents-md"><img src="https://agentmods.dev/badge/instructions/rubin-johnson/retro/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 317 This file is loaded in full into every session.

When invoked 317 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.

Model	Per session	Once invoked
Fable 5.1	$0.00317	$0.00317
Opus 5.5	$0.00127	$0.00127
Sonnet 5.5	$0.00063	$0.00063
Haiku 4.5	$0.00032	$0.00032

Measured 2mo ago against content hash 70f56286a414, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

retro 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 2mo 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 · 36 lines

What it actually says

AGENTS.md

Agent-agnostic retro logging with MCP server.

Test Command

uv run python -m pytest

Use uv run python -m pytest, not uv run pytest. The -m invocation injects the cwd into sys.path, making the retro package importable even before a full editable install.

Architecture

retro/db.py — SQLite operations, schema migrations; stdlib only; canonical source for the plugin cache copy at ~/.claude/plugins/cache/retro-dev/retro/0.1.0/scripts/db.py
retro/mcp_server.py — FastMCP server exposing log_error, log_success, query, stats
scripts/db.py — thin shim that imports and calls retro.db.main()

Schema

Current schema version: 2. Migration from v1 → v2 adds agent TEXT column automatically.

Plugin Sync

The Claude plugin uses scripts/db.py directly. After changes to retro/db.py, sync with:

cp retro/db.py ~/.claude/plugins/cache/retro-dev/retro/0.1.0/scripts/db.py

Agent Identity

agent field on entries is populated from:

agent key in the JSON payload (explicit, e.g. Gemini via MCP tool parameter)
RETRO_AGENT env var fallback (Claude sets RETRO_AGENT=claude, Codex sets RETRO_AGENT=codex)

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.

2mo ago First seen · 36 lines · 317 tokens per session scan A 70f56286a414

Subscribe to this mod's changes

retro AGENTS.md is an instructions file published in the GitHub repository rubin-johnson/retro (2 stars, last pushed 6mo ago), licensed MIT. It adds 317 tokens to every session, about $0.0013 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.

retro AGENTS.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
retro AGENTS.mdrubin-johnson/retro	Instructions file	2	6mo ago	MIT	A	317	Codex, OpenCode
vscode buildNext.instructions.mdmicrosoft/vscode	Instructions file	195k	today	MIT	A	9,719	GitHub Copilot
next.js AGENTS.mdvercel/next.js	Instructions file	143k	today	MIT	A	7,461	Codex, OpenCode
vscode oss-third-party-notices.instructions.mdmicrosoft/vscode	Instructions file	195k	today	MIT	A	5,649	GitHub Copilot
langchain AGENTS.mdlangchain-ai/langchain	Instructions file	149k	today	MIT	A	4,680	Codex, OpenCode
vscode copilot-instructions.mdmicrosoft/vscode	Instructions file	195k	today	MIT	A	3,093	GitHub Copilot
vscode model-prompts.instructions.mdmicrosoft/vscode	Instructions file	195k	today	MIT	A	2,022	GitHub Copilot

retro: Instructions file for Codex