Koskamo

501c3.HELP MCP

An official MCP server providing access to approximately 5,700 state compliance records for US 501(c)(3) nonprofits. It offers tools to retrieve requirements for a specific state, compare topics across states, and check filing deadlines, with every response including source citations and verification status.

Endpoint and access

No sign-in to connect and list tools. Individual tools may still need a vendor account, credentials, or permissions; check the documented prerequisites.

501c3.HELP MCP logo, by IT HUB Service Inc.Vendor evidenceStreamable HTTPNo sign-inEndpoint checked 2026-11-01Operated by IT HUB Service Inc.
MCP endpoint (Streamable HTTP)
https://mcp.501c3.help/
Vendor documentation

What you can do with it

  • Retrieve state-specific nonprofit compliance requirements
  • Compare compliance topics across multiple states
  • Check filing deadlines for a specific state

Source and maintenance

Vendor evidenceRegistry 0.1.1
mcp-registry: help.501c3/compliance@0.1.1Project website

Protocol and capabilities

Server
501c3help-compliance 0.1.0
MCP protocol
2025-06-18
Tools
3 advertised
Resources
Not advertised
Resource templates
Not advertised
Prompts
Not advertised
Server-advertised capabilities
{
  "tools": {}
}

Server-provided instructions

Untrusted server output shown for inspection. It is not Koskamo guidance and is excluded from knowledge search.

US nonprofit compliance requirements for all fifty states, sourced to official government citations. Always show the citation and the verification status alongside any requirement you repeat. Data licence and free API keys: https://501c3.help/license/

Tools

3 advertised

get_state_requirements
Advertised by the server during the last successful anonymous check.

Nonprofit compliance requirements for one US state, from 501c3.help's sourced records: formation, governance, charitable solicitation registration, reporting, tax and employment. Every record carries its official citation and a verification status. Records marked review_required are unsettled and must be presented as such, never as a settled rule. Optionally narrow by topic. Returns a limited number of records, not the whole state.

get_state_requirements input schema
{
  "type": "object",
  "required": [
    "state"
  ],
  "properties": {
    "state": {
      "type": "string",
      "description": "State name or two-letter abbreviation, for example 'Kansas' or 'KS'."
    },
    "topic": {
      "type": "string",
      "description": "Optional topic filter, matched loosely, for example 'solicitation', 'reporting', 'tax'."
    }
  }
}
compare_states
Advertised by the server during the last successful anonymous check.

The same compliance topic across several US states, for deciding where to incorporate or for an organization that operates in more than one state. Each state's records carry their own citation and verification status; a record marked review_required is unsettled and must not be presented as a settled rule. Accepts up to eight states.

compare_states input schema
{
  "type": "object",
  "required": [
    "states",
    "topic"
  ],
  "properties": {
    "topic": {
      "type": "string",
      "description": "The topic to compare, for example 'solicitation', 'reporting', 'formation', 'tax'."
    },
    "states": {
      "type": "array",
      "items": {
        "type": "string"
      },
      "description": "State names or two-letter abbreviations. Up to eight."
    }
  }
}
get_filing_deadlines
Advertised by the server during the last successful anonymous check.

Every requirement in one US state that has a filing deadline attached, with the deadline in plain words, the form or portal, the fee, and the official citation. Use this for 'what is due and when'. Deadlines on records marked review_required are not settled and must be shown as unconfirmed.

get_filing_deadlines input schema
{
  "type": "object",
  "required": [
    "state"
  ],
  "properties": {
    "state": {
      "type": "string",
      "description": "State name or two-letter abbreviation."
    }
  }
}

Prompts

Not advertised

No prompt definitions available.

Resources

Not advertised

No resource definitions available.

30-day availability

Aggregated from read-only remote checks; this is not a tool-execution or security guarantee.

Successful checks
1 of 1 (100%)
Average latency
233 ms
95th percentile latency
233 ms

Maintenance history

Public check and source-refresh events. Editorial and ownership records remain private.

  • · probe · passed · 233 ms · metadata changed · 3 tool(s)

Connect from your client

Each snippet registers the same endpoint; pick the client you use.

This server is operated by the named third party. Listing and endpoint checks are not an endorsement or a security audit. Review the operator's permissions, terms, and data handling before connecting. How listings are checked and corrected.

Claude Code

Run this once in a terminal. It registers the remote server. Use --scope project to write .mcp.json for the repo.
Claude Code configuration
claude mcp add --transport http 501c3-help-mcp https://mcp.501c3.help/

Codex

Run this once. Codex stores MCP servers in ~/.codex/config.toml (or .codex/config.toml in a trusted project).
Codex configuration
codex mcp add 501c3-help-mcp --url https://mcp.501c3.help/

Cursor

Merge this server into .cursor/mcp.json in your project, then enable 501c3-help-mcp in your MCP settings.
Cursor configuration
{
  "mcpServers": {
    "501c3-help-mcp": {
      "url": "https://mcp.501c3.help/"
    }
  }
}

Cline

Merge this into cline_mcp_settings.json (Cline → MCP Servers → Configure).
Cline configuration
{
  "mcpServers": {
    "501c3-help-mcp": {
      "type": "streamableHttp",
      "url": "https://mcp.501c3.help/",
      "disabled": false
    }
  }
}

VS Code

Merge this server into .vscode/mcp.json. Use MCP: List Servers to start 501c3-help-mcp and inspect its tools.
VS Code configuration
{
  "servers": {
    "501c3-help-mcp": {
      "type": "http",
      "url": "https://mcp.501c3.help/"
    }
  }
}

Gemini CLI

Run this once. It writes .gemini/settings.json in the current project; pass --scope user for ~/.gemini/settings.json.
Gemini CLI configuration
gemini mcp add --transport http 501c3-help-mcp https://mcp.501c3.help/

Claude Desktop

Merge this into claude_desktop_config.json (macOS: ~/Library/Application Support/Claude/, Windows: %APPDATA%\Claude\), then restart Claude Desktop.
Claude Desktop configuration
{
  "mcpServers": {
    "501c3-help-mcp": {
      "url": "https://mcp.501c3.help/"
    }
  }
}

Windsurf

Merge this into ~/.codeium/windsurf/mcp_config.json, then refresh MCP in Cascade. Windsurf remote servers use serverUrl, not url.
Windsurf configuration
{
  "mcpServers": {
    "501c3-help-mcp": {
      "serverUrl": "https://mcp.501c3.help/"
    }
  }
}

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