Borrowing it
Nothing to install: this file belongs to V-Songbird/foundry. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/V-Songbird/foundry/main/AGENTS.mdgit clone --depth 1 https://github.com/V-Songbird/foundryWrote 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.
[](https://agentmods.dev/instructions/v-songbird/foundry/agents-md)<a href="https://agentmods.dev/instructions/v-songbird/foundry/agents-md"><img src="https://agentmods.dev/badge/instructions/v-songbird/foundry/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.
<a href="https://agentmods.dev/instructions/v-songbird/foundry/agents-md"><img src="https://agentmods.dev/badge/instructions/v-songbird/foundry/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.03670 | $0.03670 |
| Opus 5.5 | $0.01468 | $0.01468 |
| Sonnet 5.5 | $0.00734 | $0.00734 |
| Haiku 4.5 | $0.00367 | $0.00367 |
Grade A, and why
foundry 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 8d 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.
How it starts
The opening of the file, as written. The whole thing — 100 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Foundry
Foundry is the marketplace that lists the Foreman, Hush and Razor plugins for Claude Code and
Codex. The plugins are Git submodules pinned by commit; this repository holds the two catalogs,
the release procedure, the README contract the plugins share, the brand kit their images come
from and the benchmark harness that measures them. Foreman and Razor also run on Antigravity,
which has no catalog: its users install a plugin directory from a Foundry clone, which checks the
plugin out at its pinned commit, and Antigravity reads that plugin's own root plugin.json and
hooks.json. Nothing is installed here except one package in benchmarks/, the Agent SDK that
live --sdk runs need, and the only build is the artwork under brand/. The plugins run their
hooks and tests with Node.js 22 or later and Git; Foreman needs Git 2.25 or later.
Start here
- For installation and the plugin table, read README.md.
- Before changing a catalog or cutting a release, read the release procedure.
- Before changing a plugin or flint, read its own
AGENTS.md; each submodule is a separate repository with its own rules, tests and changelog. - Before editing or reviewing a plugin README, read the README contract.
- Before changing any banner, icon, host card, Ember scene or evidence graphic, read the brand guide.
- Before changing
benchmarks/or starting a run, read the benchmarks README; a live run starts paid model sessions. - To add, pick, correct or close roadmap work, use Foreman (
/foreman:foreman). Foundry'sROADMAP.jsonland.foreman/are local and ignored; read the pitfall on old commits before any checkout.
Rules that outrank everything
- A catalog entry never carries a version. The version lives in the plugin's manifests, and a release moves only
source.shaand the gitlink. - A plugin listed in both catalogs pins the same
maincommit in both. Hush ships for Claude Code only and stays out of the Codex catalog. Antigravity needs no catalog entry; a plugin that ships for it carries a rootplugin.jsonwith the same version as its other manifests. - Plugin source changes happen in the plugin's repository on a topic branch, never as loose edits on the pinned checkout.
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.
- 8d ago Changed · +2 lines · +181 tokens per session d9c4f7cd2ae7
- 20d ago Changed · +8 lines · +612 tokens per session a289b0f51bf8
- 1mo ago Changed · +30 tokens per session 1d0642de2153
- 1mo ago Changed · +3 lines · +624 tokens per session b2ee8226d793
- 1mo ago Changed · +14 lines · +1,283 tokens per session b5fe264a1f58
- 1mo ago Changed · +7 lines · +124 tokens per session cf893a4d9c38
- 1mo ago First seen · 66 lines · 816 tokens per session scan A d31c0cadba9f
foundry AGENTS.md is an instructions file published in the GitHub repository V-Songbird/foundry (4 stars, last pushed 7d ago), licensed MIT. It adds 3,670 tokens to every session, about $0.0147 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 2026-09-10.
Other instructions, from other repositories
vscode buildNext.instructions.md
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next.js AGENTS.md
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deepseek-harness AGENTS.md
AGENTS.md instructions for deepseek-ai/deepseek-harness, covering agents.md, pre-stable apis and released session data, repository layout, commands and host sandbox failures.