mcp-serverSAFE
MCP server and API examples for NannyKeeper — the household employer tax API. Calculate nanny taxes for all 50 US states.
Overview
From the repository's own README, as read at the audited commit. Badges and raw HTML are left out.
The only API for calculating US household employer (nanny) taxes. Covers all 50 states + DC.
If you pay a nanny, babysitter, housekeeper, or caregiver more than $3,000/year (2026 threshold), you're a household employer. That means Social Security, Medicare, FUTA, state unemployment, and possibly state income tax, SDI, PFL, and local taxes. The rules are different in every state. This API handles all of it.
What's in this repo
- mcp-server/ — MCP server so AI agents (Claude, ChatGPT, etc.) can calculate nanny taxes in conversation. Published on npm as @nannykeeper/mcp-server.
- examples/ — Working code examples in Python, JavaScript, and curl.
- CLAUDE.md / AGENTS.md — Instructions for AI coding assistants.
How to calculate nanny taxes with an API
Get a free API key (email only, no credit card) at nannykeeper.com/developers/keys, then:
curl -X POST https://www.nannykeeper.com/api/v1/calculate \
-H "Authorization: Bearer nk_live_YOUR_KEY" \
-H "Content-Type: application/json" \
-d '{"state":"CA","annual_wages":35000,"pay_frequency":"biweekly"}'Returns employer taxes (Social Security, Medicare, FUTA, state unemployment), employee tax estimates, per-paycheck cost, and threshold status — all from current-year tax data maintained for every state.
Check the threshold first
Not sure if you even need to pay taxes? The threshold endpoint tells you:
curl -H "Authorization: Bearer nk_live_YOUR_KEY" \ "https://www.nannykeeper.com/api/v1/threshold?state=CA&annual_wages=2500"
For 2026, the federal FICA threshold is $3,000/year per employee. Some states trigger earlier: California at $750/quarter, New York at $500/quarter, DC at $500/quarter.
MCP server for AI agents
AI assistants guess at tax calculat
aa794f29f6adOBSERVED · 2026-10-11Connect
Built from this server's own package name, version and transport as found in its source — not copied from anyone's documentation, so it cannot drift against a page we do not control. Replace the environment placeholders with a token scoped to the least it needs.
claude mcp add mcp-server --env NANNYKEEPER_API_KEY=${NANNYKEEPER_API_KEY} -- npx -y @nannykeeper/[email protected]Exposed tools (10)
8 read · 2 write · 0 destructive.
| Tool | Risk | Description |
|---|---|---|
calculate_nanny_taxes | read | |
check_threshold | read | |
get_autopilot | read | |
get_pay_stub | write | |
get_payroll | read | |
get_state_filing_status | read | List the employer |
list_employees | read | |
manage_autopilot | read | |
preview_payroll | read | |
run_payroll | write |
Trust audit
SAFEgrade B · trust 89/100 Nothing in the source contradicts what it says it does. Grade A is reserved for packages that have also passed the behavioural sandbox.
| Layer | What it checks | Result |
|---|---|---|
| L0 | Provenance & inventory | PASS |
| L1 | Static analysis of the code | PASS |
| L2 | Instruction surface (what it tells the agent) | PASS |
| L3 | Class-specific surface | PASS |
| L4 | Behavioural (sandbox) | SKIPPED |
What the source does
- Filesystem
- none-observed
- Network
- declared (1 observation(s))
- Shell
- none-observed
- Dependencies
- not all pinned
- Secrets in source
- none-found
Findings (4)
.mcpbignore
requests
@modelcontextprotocol/sdk, zod, @types/node, typescript, vitest
Get a free API key (email only, no credit card) at [nannykeeper.com/developers/keys](https://www.nannykeeper.com/developers/keys), then:
Gates applied: no_behavioural_pass.
aa794f29f6adfull audit observations/trust-audit/mcp-server/nannykeeper__mcp-server.json · Report an issue / request a re-scanAudit history
Every audit this server has had. A grade with a past is a grade somebody is still checking.
| Date | Source | Verdict | Grade | Score | Change |
|---|---|---|---|---|---|
| 2026-10-11 | aa794f29f6ad | SAFE | B | 89 | first audit |
Questions
What is the mcp-server MCP server?
MCP server and API examples for NannyKeeper — the household employer tax API. Calculate nanny taxes for all 50 US states.
What tools does mcp-server expose?
10 in total: 8 read-only, 2 that write, and 0 that can delete or overwrite. Every one is listed on this page with its risk.
Is mcp-server safe to connect to an agent?
The audit found nothing in the source that contradicts what it says it does, and graded it B (89/100). Grade A is held back for packages that have also passed a sandboxed behavioural run, which is why a clean server reads B.
What credentials does mcp-server need?
It reads NANNYKEEPER_API_KEY from the environment. Give it a token scoped to the least it needs — an agent that can be talked into calling a tool can be talked into calling it with your credentials.
How does mcp-server run?
It speaks stdio, so it runs as a local process your client starts. It is published on npm as @nannykeeper/mcp-server at 1.15.0.
How current is this page?
The grade is for one exact copy of the source (aa794f29f6ad), read on 2026-10-11. The repository is watched and re-audited when it changes.