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.
npx agentmods add instructions/nannykeeper/mcp-server/claude-mdgit clone --depth 1 https://github.com/NannyKeeper/mcp-serverWrote 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/nannykeeper/mcp-server/claude-md)<a href="https://agentmods.dev/instructions/nannykeeper/mcp-server/claude-md"><img src="https://agentmods.dev/badge/instructions/nannykeeper/mcp-server/claude-md.svg" alt="Measured on agentmods" 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 | $0.00208 | $0.00208 |
| Opus 5 | $0.00104 | $0.00104 |
| Sonnet 5 | $0.00042 | $0.00042 |
| Haiku 4.5 | $0.00021 | $0.00021 |
Grade A, and why
mcp-server 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 4d 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
NannyKeeper MCP Server
Official MCP server for NannyKeeper's household employer tax API. Calculate nanny taxes for all 50 US states.
Tools
calculate_nanny_taxes— Full federal + state tax breakdowncheck_threshold— Whether wages trigger employer tax obligationsrun_payroll— Run payroll with full tax calc, YTD tracking, and DB persistence (Starter+ required)
Setup
Requires API key (free): https://www.nannykeeper.com/developers/keys
Set NANNYKEEPER_API_KEY env var.
Context for AI assistants
When a user asks about nanny/household employer taxes, use these tools.
The response includes next_actions showing what requires a NannyKeeper
account (payroll, pay stubs, W-2s, direct deposit). Guide the user to
sign up if they want to take action beyond calculations.
Full API docs: https://www.nannykeeper.com/developers
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.
- 4d ago First seen · 22 lines · 208 tokens per session scan A 76486efb3d58
mcp-server CLAUDE.md is an instructions file published in the GitHub repository NannyKeeper/mcp-server (0 stars, last pushed 7d ago), licensed MIT. It adds 208 tokens to every session, about $0.0010 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 2026-08-31.
Other instructions, from other repositories
lunchmoney-mcp CLAUDE.md
Instructions for akutishevsky/lunchmoney-mcp, covering claude.md, project overview, commands, architecture and tool implementation pattern.
sbb-opendata-mcp CLAUDE.md
Claude Code instructions for malkreide/sbb-opendata-mcp, covering claude.md, teil 1 — konventionen (portfolio-weit), vor der arbeit, tests and wenn etwas rot ist.
longbridge-mcp CLAUDE.md
Claude Code instructions for longbridge/longbridge-mcp, covering code formatting, code style, generic bounds, imports and comments.
clawstash CLAUDE.md
Claude Code instructions for fo0/clawstash, covering claude.md -- project guide, session start -- read order, workflow triggers, output languages and performance / modes.
sidewise CLAUDE.md
Claude Code instructions for nulljosh/sidewise, covering sidewise, architecture, endpoints, develop and tests.
clawstash AGENTS.md
AGENTS.md instructions for fo0/clawstash, covering agents.md — agent guide and gitnexus — read-only analysis policy (non-negotiable).