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Aiwyn Tax (formerly Column Tax)
mcp.columnapi.com/mcp
Excellent
Protocol
Tools
All tools have descriptions
All tools have non-empty descriptions
All tools have OpenAI behavior hints
All tools declare the three OpenAI behavior hints as booleans
Tool names use valid characters
All tool names use valid characters
Tool names follow the MCP 1–128 character range
All tool names follow the MCP recommended length
Tool names follow MCP uniqueness guidance
All tool names are unique
Tool input header annotations are valid
All x-mcp-header annotations satisfy Streamable HTTP requirements
Tool input schemas have a valid object structure
All tool input schemas have a valid object structure
Tool text has no hidden control characters
No invisible or control characters found in tool-facing text
Declared output schemas have a valid basic structure
0 declared output schema(s) pass basic structural validation; schemas may describe any JSON value, including arrays
Tool visibility metadata is valid
No view resources found — view checks skipped
Tool invocation metadata present
No view resources found — view checks skipped
Tool-linked resource URI is readable
No view resources found — view checks skipped
MCP Apps
All discovered view resources were inspected
No view resources found — view checks skipped
View resource envelope is valid
No view resources found — view checks skipped
CSP metadata covers literal external origins
No view resources found — view checks skipped
View resource metadata complete
No view resources found — view checks skipped
Declared domains respond
No view resources found — view checks skipped
View resources declare a domain
No view resources found — view checks skipped
Client compatibility
Claude Code metadata fits its 2 KB fields
1 metadata field(s) exceed Claude Code's 2 KB truncation point
How to fix: Keep each tool description and the server instructions field at or below 2 KB, and put critical guidance first.
Skills over MCP resources are readable
Server does not advertise the Skills over MCP extension
Claude tools declare applicable behavior hints
All tools include an applicable readOnlyHint or destructiveHint
All tools have a display title
All tools have a display title
Claude tool names are within 64 characters
All tool names are within Claude's 64-character limit
Cursor tool-name budget advisory
No tool name independently exhausts Cursor's observed 60-character combined budget
ChatGPT tool names are unique
All tool names are unique
OpenAI file parameters use valid schemas
All declared OpenAI file parameters use reviewer-valid schemas
Overview
- Author
- Aiwyn, Inc.
- Verification
- partner
- Auth
- None — public endpoint
- Categories
- financial-services
- Works with
- claudeclaude-apiclaude-code
- Docs
- Documentation
check_taxcalculate_taxtax_yearstax_jurisdictionstax_namespace_schematax_namespacestax_simple_returngenerate_tax_pdf_toolgenerate_uuid_v5Related MCP servers
FAQ
Aiwyn Tax (formerly Column Tax) install, tools, readiness, and alternatives.
How do I add Aiwyn Tax (formerly Column Tax) to Claude, ChatGPT, or Cursor?
Add Aiwyn Tax (formerly Column Tax) to Claude, ChatGPT, or Cursor by connecting its remote MCP URL in each client's MCP settings. In Claude, add a custom connector. In ChatGPT, add an MCP app. In Cursor, add an MCP server under Settings. The MCP URL is https://mcp.columnapi.com/mcp.
Is Aiwyn Tax (formerly Column Tax) MCP ready for ChatGPT and Claude?
As of September 15, 2026, Aiwyn Tax (formerly Column Tax) scores 96/100 on Manufact's MCP publishing checklist. The scan meets ChatGPT publishing checks and meets Claude publishing checks.
What tools does the Aiwyn Tax (formerly Column Tax) MCP server provide?
Aiwyn Tax (formerly Column Tax) provides these MCP tools: check_tax, calculate_tax, tax_years, tax_jurisdictions, tax_namespace_schema, tax_namespaces, tax_simple_return, generate_tax_pdf_tool, and generate_uuid_v5.
What are the best alternatives to Aiwyn Tax (formerly Column Tax)?
As of September 15, 2026, alternatives to Aiwyn Tax (formerly Column Tax) in financial-services on the Manufact MCP catalog include Blockscout, Contract-Factory — Sociétés & SIREN, GVRN Company Incorporation MCP, Mastercard Developers, and StatCite.
Does Aiwyn Tax (formerly Column Tax) MCP require authentication?
Aiwyn Tax (formerly Column Tax) does not require authentication. It is a public MCP endpoint you can connect without logging in.
Who develops Aiwyn Tax (formerly Column Tax)?
Aiwyn Tax (formerly Column Tax) is developed by Aiwyn, Inc.. It is listed as partner on the Claude connector directory.
Not your MCP?
Scan any public or OAuth MCP URL against ChatGPT and Claude publishing checks. No account required.