What is foundry CLAUDE.md?

A repository guide for Agentic-Insights/foundry, a marketplace of reusable coding-agent add-ons. It documents the folder layout, required files, and metadata for plugins and skills.

Maintaining plugin folders, writing skill files, setting required frontmatter fields, and checking repository structure constraints.

It gives an agent the project rules needed to add or edit marketplace content consistently.

How Agentic-Insights/foundry configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to Agentic-Insights/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.

Copy the file

curl -O https://raw.githubusercontent.com/Agentic-Insights/foundry/main/CLAUDE.md

Clone the repo

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

Made for: Claude Code.

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/agentic-insights/foundry/claude-md/github.svg)](https://agentmods.dev/instructions/agentic-insights/foundry/claude-md)

Your own site

<a href="https://agentmods.dev/instructions/agentic-insights/foundry/claude-md"><img src="https://agentmods.dev/badge/instructions/agentic-insights/foundry/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.

Your own site · 80×15

<a href="https://agentmods.dev/instructions/agentic-insights/foundry/claude-md"><img src="https://agentmods.dev/badge/instructions/agentic-insights/foundry/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 936 This file is loaded in full into every session.

When invoked 936 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	$0.00936	$0.00936
Opus 5.5	$0.00374	$0.00374
Sonnet 5.5	$0.00187	$0.00187
Haiku 4.5	$0.00094	$0.00094

Measured 1mo ago against content hash 5499fbadf41a, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, 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 1mo 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 · 114 lines

How it starts

The opening of the file, as written. The whole thing — 114 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CLAUDE.md - Terse Marketplace Guidance

Guidance for Claude Code when working with the Agentic Insights Plugin Marketplace.

Repository Structure

plugins/
├── <plugin-name>/
│   ├── .claude-plugin/plugin.json
│   ├── README.md
│   ├── CHANGELOG.md
│   ├── LICENSE (Apache-2.0)
│   ├── skills/
│   │   └── <skill-name>/SKILL.md (+ references/, assets/, scripts/)
│   ├── agents/
│   │   └── <subagent-name>.md
│   ├── examples/
│   └── recordings/

Plugin Purpose

Lead generation - Showcase AI engineering expertise
Client enablement - Post-engagement momentum patterns
Product-ized solutions - Repeatable consulting encoded as skills

Skill Structure (Agent Skills Spec)

Required: SKILL.md with YAML frontmatter (name, description) + Markdown instructions
Optional dirs: scripts/ (executable code), references/ (detailed docs), assets/ (static files)
No other subdirectories allowed
Keep SKILL.md under 500 lines (use progressive disclosure)
Directory name MUST match frontmatter name: field

Frontmatter Fields

Required: name (1-64 chars, lowercase alphanumeric-hyphens), description (1-1024 chars, include "Use when...")
Optional: license (SPDX), compatibility (environment reqs), metadata (author, version, tags), allowed-tools (space-delimited)

Skill Writing Patterns

Terse (Preferred for Action Skills)

Bullet points, no prose
"Do this", "Then this"
Concrete examples only
Reference detailed docs via links
~50-100 lines typical

Comprehensive (For Teaching/Reference)

Can exceed 500 lines if justified
Multiple sections with explanations
Extensive examples embedded
Use for: tutorials, API docs, specifications

See assets/ subdirectory for style examples.

Quality Checklist

Validate with skills-ref validate path/to/skill
SKILL.md exists with valid frontmatter
Description includes "Use when..."
Examples are runnable/concrete
No hardcoded paths (use relative paths)
Progressive disclosure applied (refs → references/, assets/)
Cross-platform compatible (test with multiple agents)
Licensed under Apache-2.0
Plugin has README.md with installation instructions

Read the full file on GitHub · 114 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.

1mo ago First seen · 114 lines · 936 tokens per session scan A 5499fbadf41a

Subscribe to this mod's changes

foundry CLAUDE.md is an instructions file published in the GitHub repository Agentic-Insights/foundry (5 stars, last pushed 4mo ago), licensed Apache-2.0. It adds 936 tokens to every session, about $0.0037 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.

Claude Code

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 · 9,649 tokens

foundry: Instructions file for Claude Code