Borrowing it
Nothing to install: this file belongs to foundry-works/foundry-research. 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/foundry-works/foundry-research/main/CLAUDE.mdgit clone --depth 1 https://github.com/foundry-works/foundry-researchWrote 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/foundry-works/foundry-research/claude-md)<a href="https://agentmods.dev/instructions/foundry-works/foundry-research/claude-md"><img src="https://agentmods.dev/badge/instructions/foundry-works/foundry-research/claude-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/foundry-works/foundry-research/claude-md"><img src="https://agentmods.dev/badge/instructions/foundry-works/foundry-research/claude-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 | $0.00396 | $0.00396 |
| Opus 5.5 | $0.00158 | $0.00158 |
| Sonnet 5.5 | $0.00079 | $0.00079 |
| Haiku 4.5 | $0.00040 | $0.00040 |
Grade A, and why
foundry-research CLAUDE.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.
What it actually says
Foundry Research
Plugin Development
This repo is a Claude Code plugin. Edit files in skills/ and agents/ directly — they are the plugin source.
- Local testing:
claude --plugin-dir .from the repo root - Reload after changes:
/reload-pluginsin the session - Skill invocation:
/foundry-research:deep-research,/foundry-research:reflect,/foundry-research:improve,/foundry-research:deep-research-revision
Plugin Gotchas
- hooks.json uses a nested format. Each event entry wraps commands in a
hooksarray:{"hooks": {"SessionStart": [{"hooks": [{"type": "command", "command": "..."}]}]}}. This differs from.claude/settings.jsonhook format — don't confuse them. - Agent frontmatter cannot include
permissionMode,hooks, ormcpServers. These are blocked for plugin-shipped agents. - Bump
versioninplugin.jsonafter changes. Installed plugins cache by version — edits won't reach users until the version changes. agents,skills, andhooksinplugin.jsonoverride defaults. If omitted, the defaultagents/,skills/, andhooks/hooks.jsonare auto-discovered. Only set them explicitly if you need custom paths. Do not pointhooksathooks/hooks.json— it loads automatically and declaring it again causes a duplicate error.- All paths in
plugin.jsonmust start with./and be relative to the repo root.
Design Principles
Read PRINCIPLES.md before developing new plans or proposing changes to skills and agents. It captures the design philosophy for this project — use it to evaluate whether proposed improvements align with how we build.
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 · 22 lines · 396 tokens per session scan A a5e8c949d20b
foundry-research CLAUDE.md is an instructions file published in the GitHub repository foundry-works/foundry-research (6 stars, last pushed 5mo ago), licensed MIT. It adds 396 tokens to every session, about $0.0016 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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