check_filing_extension — Duck Tax MCP Tool Read-only
check_filing_extension
(check filing extension) is one of 20 tools on the
Duck Tax
MCP server. Connect the server and your client discovers it on the handshake.
by client
How to call check_filing_extension from your client
- Claude Code Duck Tax check_filing_extension run in your project directory
- Claude Desktop Duck Tax check_filing_extension ~/Library/Application Support/Claude/claude_desktop_config.json
- Cursor Duck Tax check_filing_extension ~/.cursor/mcp.json
- VS Code Duck Tax check_filing_extension .vscode/mcp.json
- Zed Duck Tax check_filing_extension ~/.config/zed/settings.json
- Windsurf Duck Tax check_filing_extension ~/.codeium/windsurf/mcp_config.json
- Cline Duck Tax check_filing_extension ~/Library/Application Support/Code/User/globalStorage/saoudrizwan.claude-dev/settings/cline_mcp_settings.json
- Gemini CLI Duck Tax check_filing_extension ~/.gemini/settings.json
- Grok Duck Tax check_filing_extension .mcp.json (in your project root)
- ChatGPT Duck Tax check_filing_extension Settings → Connectors → Advanced → Developer mode
- Claude.ai Duck Tax check_filing_extension Settings → Connectors → Add custom connector
- LangChain Duck Tax check_filing_extension pip install langchain-mcp-adapters
Fastest route
claude mcp add --transport http ducktax https://ducktax.com/api/mcpOther tools on this server
- check_accounts
- dormant_figures
- totals_to_figures
- late_filing_penalty
- list_jurisdictions
- sample_accounts
- lookup_company
- search_companies
- get_prior_year_figures
- explain_accounts
- categorise_transactions
- draft_extension_reason
- list_saved_filings
- save_filing
- delete_filing
- track_company_deadlines
- list_tracked_companies
- untrack_company_deadlines
- server_status
This list was read from the server itself, by connecting to it and calling tools/list on 24 September 2026. It is what
the server actually exposes, not what its listing claims.
Mutating and Read-only are read off each tool's name, not its schema — a hint, not a guarantee. The registry stores tool names only; connect the server for its live schemas.