PromptFiling MCP

An official Model Context Protocol server provided by PromptFiling that allows AI agents to check UK Companies House filing deadlines for specific companies and retrieve static late-filing penalty tables. It supports anonymous, read-only access with rate limiting.

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.

Vendor evidenceStreamable HTTPNo sign-inEndpoint checked 2026-11-01Operated by PromptFiling

MCP endpoint (Streamable HTTP)

https://mcp.promptfiling.co.uk/

Vendor documentation

What you can do with it

Check statutory filing deadlines for a UK company
Retrieve late-filing penalty amounts
Verify company registration status via live lookup

Source and maintenance

Vendor evidenceRegistry 1.11.03

mcp-registry: uk.co.promptfiling/deadlines@1.11.03 Project website

Protocol and capabilities

Server: promptfiling 1.71.04
MCP protocol: 2025-06-18
Tools: 2 advertised
Resources: Not advertised
Resource templates: Not advertised
Prompts: Not advertised

Server-advertised capabilities

{
  "tools": {
    "listChanged": false
  }
}

Server-provided instructions

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

Free UK Companies House deadline checks. Prefer the company number over the name when the user has it. Data comes from the official public register (cached up to 1 hour). PromptFiling is an independent tool, not connected to Companies House or HMRC; answers are guidance, not advice.

Tools

2 advertised

check_company_deadlines — Check a UK company's filing deadlines

Advertised by the server during the last successful anonymous check.

Advertised read-onlyOpen-world

Look up a UK limited company by company number (preferred — e.g. 01234567 or SC123456) or by name, and get its statutory Companies House deadlines: when annual accounts and the confirmation statement are due, days remaining, the automatic late-filing penalty for accounts, and dormancy signals from the public register. Free, no account; data from the official Companies House register.

check_company_deadlines input schema

{
  "type": "object",
  "required": [
    "query"
  ],
  "properties": {
    "query": {
      "type": "string",
      "description": "Company number (8 digits, or 2 letters + 6 digits) or a company name to search"
    }
  }
}

check_company_deadlines annotations

{
  "readOnlyHint": true,
  "openWorldHint": true
}

uk_late_filing_penalties — UK late-filing penalty table

Advertised by the server during the last successful anonymous check.

Advertised read-only

The current Companies House late-filing penalty bands for annual accounts — private companies and public companies (plc) — the doubling rule for two late years running, and what missing a confirmation statement risks. Static reference — no lookup performed.

uk_late_filing_penalties input schema

{
  "type": "object",
  "properties": {}
}

uk_late_filing_penalties annotations

{
  "readOnlyHint": true,
  "openWorldHint": false
}

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: 1260 ms
95th percentile latency: 1260 ms

Maintenance history

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

Nov 1, 2026, 8:22 AM UTC · probe · passed · 1260 ms · metadata changed · 2 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 promptfiling-mcp https://mcp.promptfiling.co.uk/

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 promptfiling-mcp --url https://mcp.promptfiling.co.uk/

Cursor

Merge this server into .cursor/mcp.json in your project, then enable promptfiling-mcp in your MCP settings.

Cursor configuration

{
  "mcpServers": {
    "promptfiling-mcp": {
      "url": "https://mcp.promptfiling.co.uk/"
    }
  }
}

Cline

Merge this into cline_mcp_settings.json (Cline → MCP Servers → Configure).

Cline configuration

{
  "mcpServers": {
    "promptfiling-mcp": {
      "type": "streamableHttp",
      "url": "https://mcp.promptfiling.co.uk/",
      "disabled": false
    }
  }
}

VS Code

Merge this server into .vscode/mcp.json. Use MCP: List Servers to start promptfiling-mcp and inspect its tools.

VS Code configuration

{
  "servers": {
    "promptfiling-mcp": {
      "type": "http",
      "url": "https://mcp.promptfiling.co.uk/"
    }
  }
}

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 promptfiling-mcp https://mcp.promptfiling.co.uk/

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": {
    "promptfiling-mcp": {
      "url": "https://mcp.promptfiling.co.uk/"
    }
  }
}

Windsurf

Merge this into ~/.codeium/windsurf/mcp_config.json, then refresh MCP in Cascade. Windsurf remote servers use serverUrl, not url.

Windsurf configuration

{
  "mcpServers": {
    "promptfiling-mcp": {
      "serverUrl": "https://mcp.promptfiling.co.uk/"
    }
  }
}

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