Borrowing it
Nothing to install: this file belongs to NannyKeeper/mcp-server. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/NannyKeeper/mcp-server/main/AGENTS.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/agents-md)<a href="https://agentmods.dev/instructions/nannykeeper/mcp-server/agents-md"><img src="https://agentmods.dev/badge/instructions/nannykeeper/mcp-server/agents-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.
<a href="https://agentmods.dev/instructions/nannykeeper/mcp-server/agents-md"><img src="https://agentmods.dev/badge/instructions/nannykeeper/mcp-server/agents-md.svg" alt="Reviewed on agentmods" width="80" 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 5.1 | $0.00328 | $0.00328 |
| Opus 5.5 | $0.00131 | $0.00131 |
| Sonnet 5.5 | $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 2mo 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 — 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.
- 2mo ago 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 4d ago), licensed MIT. It adds 328 tokens to every session, about $0.0013 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.
mcp-server AGENTS.md compared with instructions from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| mcp-server AGENTS.mdNannyKeeper/mcp-server | Instructions file | 0 | 4d ago | MIT | A | 328 | Codex, OpenCode |
| vscode buildNext.instructions.mdmicrosoft/vscode | Instructions file | 195k | yesterday | MIT | A | 9,719 | GitHub Copilot |
| next.js AGENTS.mdvercel/next.js | Instructions file | 143k | yesterday | MIT | A | 7,461 | Codex, OpenCode |
| langchain AGENTS.mdlangchain-ai/langchain | Instructions file | 149k | yesterday | MIT | A | 4,680 | Codex, OpenCode |
| vscode oss-third-party-notices.instructions.mdmicrosoft/vscode | Instructions file | 195k | yesterday | MIT | A | 5,516 | GitHub Copilot |
| vscode copilot-instructions.mdmicrosoft/vscode | Instructions file | 195k | yesterday | MIT | A | 3,093 | GitHub Copilot |
| deepseek-harness AGENTS.mddeepseek-ai/deepseek-harness | Instructions file | 274k | 2d ago | MIT | A | 4,313 | Codex, OpenCode |