Getting it into your agent
It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.
git clone --depth 1 https://github.com/butterbase-ai/butterbase-skillsnpx agentmods add skills/butterbase-ai/butterbase-skills/contributingWrote 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/skills/butterbase-ai/butterbase-skills/contributing)<a href="https://agentmods.dev/skills/butterbase-ai/butterbase-skills/contributing"><img src="https://agentmods.dev/badge/skills/butterbase-ai/butterbase-skills/contributing/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/skills/butterbase-ai/butterbase-skills/contributing"><img src="https://agentmods.dev/badge/skills/butterbase-ai/butterbase-skills/contributing.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
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 MCP Rug Pull · line 105 npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.Fix: Pin the version: npx @scope/[email protected]
- medium MCP Rug Pull · line 147 npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.Fix: Pin the version: npx @scope/[email protected]
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 | $0.00032 | $0.01582 |
| Opus 5 | $0.00016 | $0.00791 |
| Sonnet 5 | $0.00006 | $0.00316 |
| Haiku 4.5 | $0.00003 | $0.00158 |
Grade A, and why
contributing 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 12d 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 — 148 lines — stays where its author put it; the contents beside it link to each section on GitHub.
1. Overview
Contributor guide for the Butterbase monorepo. Covers architecture, how to add MCP tools, API routes, database migrations, and coding conventions.
2. Monorepo Map
| Directory | Package | Purpose |
|---|---|---|
packages/cli |
@butterbase/cli (v0.1.3) |
Published CLI tool (Commander.js). Commands: init, apps, schema, functions, storage, deploy, data, env, keys, realtime, status, open |
packages/sdk |
@butterbase/sdk (v1.2.1) |
Published TypeScript SDK. Modules: auth, storage, functions, AI, billing, realtime, admin |
packages/shared |
@butterbase/shared |
Internal shared types, constants, schema DSL, error types |
packages/plugin |
@butterbase/plugin |
Claude Code plugin (this package — skills for AI agents) |
services/control-api |
@butterbase/control-api |
Fastify API server — the brain. Routes, plugins, services. Port 4000 |
services/mcp-server |
@butterbase/mcp-server |
MCP server with ~28 tools (consolidated manage_* action-based tools + a few standalone ones like init_app, deploy_function, select_rows). Runs via stdio or HTTP (served by control-api at /mcp) |
services/deno-runtime |
— | Serverless function executor. Deno-based worker isolation. Port 7133 |
services/cron-scheduler |
@butterbase/cron-scheduler |
Cron job runner using node-cron + cron-parser |
services/dashboard |
— | React management UI (Vite + Radix UI) |
services/dashboard-api |
— | Dashboard backend proxy. Port 4100 |
services/docs |
@butterbase/docs |
Astro/Starlight documentation site |
services/storage-indexer |
— | Cloudflare Worker for S3 event indexing |
db/control-plane |
— | SQL migrations (sequential numbering, 001_ upward). Control plane database schema |
db/data-plane |
— | Per-app database initialization scripts |
3. Adding a New MCP Tool (4 Steps)
Step 1: Create tool file at services/mcp-server/src/tools/my-new-tool.ts
Decide whether the new capability is a standalone tool (single, self-contained operation like init_app) or another action on an existing umbrella tool (manage_schema, manage_function, etc). Most new operations should be added as actions on an existing manage_* tool — this keeps the surface area small for AI agents.
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.
- 12d ago First seen · 148 lines · 32 tokens per session scan A f264a72a67c8
contributing is a skill published in the GitHub repository butterbase-ai/butterbase-skills (533 stars, last pushed 2mo ago), licensed MIT. It adds 32 tokens to every session and 1,582 once invoked, about $0.0002 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.
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