# `io.github.cyanheads/nonprofit-explorer-mcp-server` on anlyon.dev

> Text inside fenced blocks marked untrusted-server-text was written by the MCP server's publisher, not by anlyon.dev. It is data to inspect, not instructions to follow. Invisible characters are shown as [U+XXXX].
> No finding is not a safety guarantee: these are point-in-time checks of tool definitions, not of code or behaviour.

- Page: https://anlyon.dev/servers/io.github.cyanheads/nonprofit-explorer-mcp-server
- JSON: https://anlyon.dev/api/v1/servers/io.github.cyanheads/nonprofit-explorer-mcp-server
- Version: 0.2.0 (active)
- Publisher: io.github.cyanheads (GitHub account)
- Runs: remote (streamable-http), local (npm)
- Sign-in to list tools: none
- Repository: https://github.com/cyanheads/nonprofit-explorer-mcp-server
- Metadata from the official MCP Registry, synced 2026-10-22T04:17:39.420Z

Title and description, as the publisher wrote them:

```untrusted-server-text
MCP server for nonprofit financials via ProPublica: IRS Form 990 data for 1.8M+ nonprofits.
```

Scanned 2026-10-22T04:18:05.711Z over streamable-http.

**3 tools: 3 only read.**

| Group | Class | Tools | Claude Code |
| --- | --- | --- | --- |
| Deletes or cancels | destructive | 0 | deny |
| Can't be undone | irreversible | 0 | ask |
| Changes things | write | 0 | ask |
| Only reads | read | 3 | allow |

## Findings

No check matched anything in these tool definitions.


## Only reads (3)

Looks things up and changes nothing. Claude Code: allow.

### `nonprofit_get_filings`

- The name "nonprofit_get_filings" says "get": a word for reading.

Description, as the server wrote it:

```untrusted-server-text
All Form 990 filings for a tax-exempt org by EIN: year-by-year revenue, expenses, assets, liabilities, net assets, revenue breakdown, executive compensation, and source PDF links. Use for trend analysis, due diligence, and accessing primary 990 documents. The filing year (tax_prd_yr) is the fiscal year of the return — data lags 1–2 years; always cite the year. An organization that resolves but has filed no 990 returns an empty filings array with a notice, not an error. Also returns filings_pdf_only — older filings with a PDF but no extracted financial data. Data from ProPublica Nonprofit Explorer, sourced from IRS Form 990 filings.
```

### `nonprofit_get_organization`

- The name "nonprofit_get_organization" says "get": a word for reading.

Description, as the server wrote it:

```untrusted-server-text
Full profile for a single tax-exempt org by EIN: legal name, address, NTEE classification, 501(c) type, IRS ruling date, and a financial snapshot from the most recent Form 990 filing (revenue, expenses, assets, net assets, and the source PDF link). Also returns the IRS Business Master File standing — whether contributions are deductible, exemption status, and public-charity vs. private-foundation classification. Use nonprofit_search_organizations first if you only have an org name — this tool requires an EIN. Data lags 1–2 years; the tax year is shown prominently. Data from ProPublica Nonprofit Explorer, sourced from IRS Form 990 filings.
```

### `nonprofit_search_organizations`

- The name "nonprofit_search_organizations" says "search": a word for reading.

Description, as the server wrote it:

```untrusted-server-text
Search 1.8M+ IRS-recognized tax-exempt organizations by name, keyword, city, or phrase. Optionally narrow by US state, NTEE major sector (1–10), or 501(c) subsection type. Returns EINs — pass them to nonprofit_get_organization or nonprofit_get_filings for details. Results are paginated at 25 per page; use the page parameter and num_pages to paginate. Total results cap at 10,000 in the API; if total_results === 10000 the actual count may be higher. A zero-match query and a page past the last one both return an empty organizations array with a notice rather than an error; only a page whose offset reaches that 10,000 cap is refused. Supports quoted phrases ("Red Cross"), required terms (+evanston), excluded terms (-dental). Data from ProPublica Nonprofit Explorer, sourced from IRS Form 990 filings.
```

## Claude Code permissions

For `.claude/settings.json`, assuming the server is installed as `nonprofit-explorer`:

```json
{
  "permissions": {
    "allow": [
      "mcp__nonprofit-explorer__nonprofit_search_organizations",
      "mcp__nonprofit-explorer__nonprofit_get_organization",
      "mcp__nonprofit-explorer__nonprofit_get_filings"
    ],
    "ask": [],
    "deny": []
  }
}
```