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Foundation

Foundation is a skill for Claude Code from rsts-dev/claude-buddy-marketplace. It costs 56 tokens per session (1,871 once invoked), scanned A, original, MIT.

A skill for creating and maintaining a project foundation document at /directive/foundation.md. The document records project principles, domain information, and related guidance.

In plain words
What is it for?
Use it to create or update the foundation document, detect the project's domain, analyze the codebase, and propagate approved changes.
Why use it?
It gives a project a central reference for its technology and working rules, reducing inconsistency across plans and other project documents.

Skill for Claude Code

Written for Claude Code: shipped in a Claude Code plugin. Also seen: reads .claude/ paths.

Part of the buddy plugin — 6 skills, 7 commands shipped together

not rated 17repo 19d ago A scan SkillSpector: warn 56 tokens original MIT

Good fit Use it to create or update the foundation document, detect the project's domain, analyze the codebase, and propagate approved changes.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/rsts-dev/claude-buddy-marketplace/foundation
View source ↗ rsts-dev/claude-buddy-marketplace
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.

Any agent
npx skills add rsts-dev/claude-buddy-marketplace --skill foundation
Clone the repo
git clone --depth 1 https://github.com/rsts-dev/claude-buddy-marketplace

Made for: Claude Code.

Or install buddy, the plugin that ships this one along with the rest of its 6 skills, 7 commands.

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.

agentmods badge for Foundation

README.md
[![agentmods](https://agentmods.dev/badge/skills/rsts-dev/claude-buddy-marketplace/foundation/github.svg)](https://agentmods.dev/skills/rsts-dev/claude-buddy-marketplace/foundation)
Your own site
<a href="https://agentmods.dev/skills/rsts-dev/claude-buddy-marketplace/foundation"><img src="https://agentmods.dev/badge/skills/rsts-dev/claude-buddy-marketplace/foundation/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.

agentmods 80×15 button for Foundation

Your own site · 80×15
<a href="https://agentmods.dev/skills/rsts-dev/claude-buddy-marketplace/foundation"><img src="https://agentmods.dev/badge/skills/rsts-dev/claude-buddy-marketplace/foundation.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 56 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,871 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits
  • NVIDIA SkillSpector warn 7 Sept 2026
SkillSpector: 2 findings, up to medium

These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →

  • medium Rogue Agent · line 3
    Skill establishes unauthorized persistence across sessions via cron jobs, startup scripts, or state files. Session persistence allows an attacker to maintain access beyond the current interaction.
    Fix: Remove any persistence mechanisms (cron jobs, startup scripts, state files). Skills should not maintain state across sessions without explicit user consent.
  • medium Rogue Agent · line 74
    Skill establishes unauthorized persistence across sessions via cron jobs, startup scripts, or state files. Session persistence allows an attacker to maintain access beyond the current interaction.
    Fix: Remove any persistence mechanisms (cron jobs, startup scripts, state files). Skills should not maintain state across sessions without explicit user consent.
How audits are shown
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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00056 $0.01871
Opus 5 $0.00028 $0.00936
Sonnet 5 $0.00011 $0.00374
Haiku 4.5 $0.00006 $0.00187

Measured 10d ago against content hash c2c76aeffc5d, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

Foundation 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 10d 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.

plugins/buddy/skills/Foundation/SKILL.md · 197 lines

How it starts

The opening of the file, as written. The whole thing — 197 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Foundation

Maintain the authoritative project foundation document. Automatically detects the project's technology domain, creates from codebase analysis or user input, updates with semantic versioning, and propagates changes to dependent artifacts.

Customization

Before executing, check for user customizations at: ~/.claude/LIFEOS/USER/CUSTOMIZATIONS/SKILLS/Foundation/

If this directory exists, load and apply any PREFERENCES.md configurations. If not, proceed with defaults.

Prerequisites

LifeOS must be installed. Check ~/.claude/LIFEOS/VERSION. If missing, inform user: "LifeOS is required. Run /setup:lifeos to install."

Workflow Routing

Workflow Trigger File
CreateFoundation No /directive/foundation.md exists Workflows/CreateFoundation.md
UpdateFoundation Foundation exists, user wants changes Workflows/UpdateFoundation.md
CreateDomain User wants to create a new domain Workflows/CreateDomain.md
DetectDomain Called by CreateFoundation during setup Workflows/DetectDomain.md

Auto-Detection

  1. Check if user input contains "create domain", "new domain", or "add domain"
    • If yes -> route to Workflows/CreateDomain.md
  2. Check if /directive/foundation.md exists
    • If no -> route to Workflows/CreateFoundation.md
      • CreateFoundation automatically detects the project domain via DetectDomain.md
      • Delegates to the domain's analyze.md for deep analysis
    • If yes -> route to Workflows/UpdateFoundation.md

Domain Architecture

Technology-specific knowledge lives in Domains/, where each subdirectory is a self-contained domain definition. Domains are auto-discovered — no registration needed.

Available Domains

Domain Type Key Description
default default Generic fallback for any project type
react react React.js frontend applications
jhipster jhipster JHipster full-stack (Angular + Spring Boot)
mulesoft mulesoft MuleSoft integration and API development

Read the full file on GitHub · 197 lines

Files

What ships with it

60 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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.

  1. 10d ago First seen · 197 lines · 56 tokens per session scan A c2c76aeffc5d

Subscribe to this mod's changes

Foundation is a skill published in the GitHub repository rsts-dev/claude-buddy-marketplace (17 stars, last pushed 19d ago), licensed MIT. It adds 56 tokens to every session and 1,871 once invoked, about $0.0003 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.

PlanningWriting and docs
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