What is foundry CLAUDE.md?

Project instructions for Foundry, a system that coordinates several AI agents to work through Linear tickets, which are tasks tracked in the Linear project-management tool.

Use them when building, running, configuring, or changing Foundry, including its Claude and Codex agent processes.

They give coding agents the project’s build commands, architecture, directory layout, configuration, and agent workflow in one place.

foundry CLAUDE.md — Instructions file for coding agents by leixusam: Project instructions for Foundry, a system that coordinates several…

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.

agentmods

npx agentmods add instructions/leixusam/foundry/claude-md

Clone the repo

git clone --depth 1 https://github.com/leixusam/foundry

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/leixusam/foundry/claude-md.svg)](https://agentmods.dev/instructions/leixusam/foundry/claude-md)

Your own site

<a href="https://agentmods.dev/instructions/leixusam/foundry/claude-md"><img src="https://agentmods.dev/badge/instructions/leixusam/foundry/claude-md.svg" alt="Measured on agentmods" height="20"></a>

Per session 669 This file is loaded in full into every session.

When invoked 669 The same file — it is already loaded in full.

Security scan A 0 findings. Scan, not verified.

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	$0.00669	$0.00669
Opus 5	$0.00334	$0.00334
Sonnet 5	$0.00134	$0.00134
Haiku 4.5	$0.00067	$0.00067

Measured 3d ago against content hash 9110ad9e04af, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

foundry 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 3d 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.

CLAUDE.md · 63 lines

How it starts

The opening of the file, as written. The whole thing — 63 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Foundry - Autonomous Product Development System

This is the core Foundry autonomous development loop. Foundry orchestrates multiple AI agents to work on Linear tickets autonomously.

Build & Run

Install: npm install
Build: npm run build
Start: npm run start
Dev: npm run dev (watch mode)
Typecheck: npm run typecheck

Architecture

Agent Pipeline

Agent 1 (Linear Reader): Scans Linear for tickets, claims work
Agent 2 (Worker): Executes the actual development work
Agent 3 (Linear Writer): Updates Linear with results

Directory Structure

src/ - TypeScript source code
dist/ - Compiled JavaScript (gitignored)
prompts/ - Agent prompt templates

Key Files

src/index.ts - Main loop entry point
src/config.ts - Configuration management
src/lib/claude.ts - Claude Code spawner
src/lib/codex.ts - Codex CLI spawner
src/lib/prompts.ts - Prompt loader

Environment Variables

FOUNDRY_PROVIDER - "claude" (default) or "codex"
FOUNDRY_CLAUDE_MODEL - "opus" (default), "sonnet", or "haiku"
FOUNDRY_MAX_ITERATIONS - Limit iterations (0 = unlimited)
CODEX_MODEL - Codex model name
CODEX_REASONING_EFFORT - "low", "medium", "high" (default), "extra_high"

Output

Runtime logs are written to .foundry/output/ (gitignored). Output folder names are prefixed with timestamps for easy sorting (e.g., 20250126-051600-swift-wyvern/).

Project Artifacts

The foundry-docs/ directory at project root stores Foundry's work artifacts:

foundry-docs/research/ - Research documents for tickets
foundry-docs/plans/ - Implementation plans
foundry-docs/validation/ - Validation reports
foundry-docs/shared/ - Shared context between sessions

Releasing (Maintainers)

Releases are performed via GitHub Actions (see README.md for the full checklist).

GitHub → Actions → Release (branch: main)
- Inputs: release_type (patch|minor|major), npm_tag (default latest), dry_run (true runs CI only)
- Requires NPM_TOKEN secret; optionally RELEASE_TOKEN if the workflow needs to push to a protected main and/or create the GitHub Release.
Recovery: If a tag exists but publish failed, run Publish existing ref to npm with ref = vX.Y.Z.
- Note: Publish existing ref to npm is a manual recovery workflow (workflow_dispatch); it does not run automatically on GitHub Release events.

Read the full file on GitHub · 63 lines

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.

3d ago First seen · 63 lines · 669 tokens per session scan A 9110ad9e04af

Subscribe to this mod's changes

foundry CLAUDE.md is an instructions file published in the GitHub repository leixusam/foundry (11 stars, last pushed 6mo ago), licensed MIT. It adds 669 tokens to every session, about $0.0033 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.

Building agents Project management

vscode buildNext.instructions.md

Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).

microsoft/vscode · 6,785 tokens

foundry CLAUDE.md