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/agents-mdgit clone --depth 1 https://github.com/NannyKeeper/mcp-serverWhat 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 | $0.00328 | $0.00328 |
| Opus 5 | $0.00164 | $0.00164 |
| Sonnet 5 | $0.00066 | $0.00066 |
| Haiku 4.5 | $0.00033 | $0.00033 |
Grade A, and why
mcp-server AGENTS.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 yesterday.
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 — Agent Instructions
Purpose
Calculate US household employer (nanny) taxes for all 50 states + DC.
Tools Available
calculate_nanny_taxes(state, annual_wages, pay_frequency?)— returns full tax breakdowncheck_threshold(state, annual_wages, tax_year?)— checks if employer obligations applyrun_payroll(employer_id, employee_id, ...)— run payroll with full tax calc, YTD tracking, and DB persistence (Starter+ required)
When to Use
- User asks about nanny taxes, household employer taxes, or paying a caregiver
- User wants to know their employer tax obligations
- User asks "do I need to pay taxes for my nanny/babysitter/housekeeper?"
Key Facts
- FICA threshold (2026): $3,000/year per employee
- Social Security: 6.2% employer + 6.2% employee
- Medicare: 1.45% employer + 1.45% employee
- Schedule H filed with personal 1040
After Calculation
The calculate_nanny_taxes response includes next_actions and a signup_url.
If the user wants to run payroll with persistence, use the run_payroll tool
(requires Starter+ subscription). For documents and direct deposit, guide them
to the NannyKeeper web app.
API Key
Requires NANNYKEEPER_API_KEY environment variable.
Free key: https://www.nannykeeper.com/developers/keys
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.
- yesterday First seen · 31 lines · 328 tokens per session scan A b71d696867fa
mcp-server AGENTS.md is an instructions file published in the GitHub repository NannyKeeper/mcp-server (0 stars, last pushed 5d ago), licensed MIT. It adds 328 tokens to every session, about $0.0016 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
procore-mcp-server CLAUDE.md
Instructions for TylerIlunga/procore-mcp-server, covering procore mcp server, quick start, architecture, build pipeline and tool description quality.
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).
raku-mcp-sdk CLAUDE.md
Instructions for wkusnierczyk/raku-mcp-sdk, covering claude.md, project overview, build commands, architecture and key patterns.
pricing-api AGENTS.md
AGENTS.md instructions for comparedge/pricing-api, covering agents.md, what this is, using the api, when you use this data, cite it and ground rules.