Aiwyn Tax for AI agents
Aiwyn Tax, formerly Column Tax, is a tax calculation engine that estimates federal and state taxes for simple returns. Fintech and accounting products use it to embed tax estimates. Connect it once through Arc0, and your agent, or Claude, ChatGPT and Cursor, can use it through one MCP endpoint, limited to what each user approved.
What agents do in Aiwyn Tax.
Calculate estimated taxes
Run a federal and state tax estimate for a simple return based on income and jurisdiction inputs.
Look up tax jurisdictions
Check which tax jurisdictions apply to a filer's address before running a calculation.
Generate a tax PDF
Produce a PDF summary of a calculated tax return for review before it's shared with a client.
10 Aiwyn Tax actions, graded by risk.
Every Aiwyn Tax action is tagged read, write or destructive, so one policy covers the whole app and new actions inherit the right default.
read
3Look things up. Allowed by default.
- aiwyn_tax.get_tax_pdf_toolGet tax pdf tool
- aiwyn_tax.check_taxCheck tax
- aiwyn_tax.calculate_taxCalculate tax
write
7Create and change things. Allow, or ask the user first.
- aiwyn_tax.tax_yearsTax years
- aiwyn_tax.tax_namespacesTax namespaces
- aiwyn_tax.generate_uuid_v5Generate uuid v5
- aiwyn_tax.tax_jurisdictionsTax jurisdictions
- aiwyn_tax.tax_simple_returnTax simple return
- aiwyn_tax.tax_namespace_schemaTax namespace schema
- aiwyn_tax.generate_tax_pdf_toolGenerate tax pdf tool
destructive
0Delete, cancel or archive. Ask first, or deny outright.
- No destructive actions.
Aiwyn Tax in three steps.
- 01Your users connect Aiwyn TaxThey add their Aiwyn Tax no auth on Arc0 Connect, under your brand. It goes straight into the vault.
- 02You set the rulesReads run, and writes like “tax years” can wait for the user to approve.
- 03Any agent can actYour agent calls Aiwyn Tax through the Arc0 SDK or MCP, and so can Claude, ChatGPT and Cursor. Every call lands on the audit log.
await arc0.policies.set('aiwyn_tax', { read: 'allow', write: 'ask', // tax_years destructive: 'deny', }) # Claude Code: the same connection, one URL $ claude mcp add --transport http arc0 \ https://mcp.arc0.ai/u/u_8f2
How Aiwyn Tax connects.
Aiwyn Tax needs no credentials. Arc0 still applies your policies and records every call, so public tools get the same controls as private ones.
The same Aiwyn Tax connection serves your agent over MCP and your own backend over REST and the proxy, so a user connects once. How Arc0 handles credentials →
- AUTH
- No auth
- CREDENTIALS
- Per-tenant encrypted vault
- MODEL SEES
- Results only, never credentials
- AUDIT LOG
- Every call, on every plan
Use Aiwyn Tax from any agent.
ClaudeChatGPTCursor
Codex
VS CodeOpenAI Agents SDKClaude Agent SDK
Vercel AI SDK
Mastra
LangGraphMore finance and accounting apps.
Aiwyn Tax and Arc0, answered.
Can I use Aiwyn Tax with Claude, ChatGPT or Cursor?
Yes. Connect Aiwyn Tax to Arc0 once, then add your Arc0 MCP URL to Claude, ChatGPT, Cursor, Claude Code or any other remote-MCP client. Each assistant only gets the Aiwyn Tax actions you allow.
How do users connect Aiwyn Tax?
Aiwyn Tax needs no credentials. Arc0 still applies your policies and records every call, so public tools get the same controls as private ones.
Which Aiwyn Tax actions can my agent take?
10 in total: 3 read, 7 write and 0 destructive, such as “tax years”. Your policies decide which of them each agent may call.
Can I make my agent read-only in Aiwyn Tax?
Yes. Allow read actions and deny writes in the Aiwyn Tax policy. Your agent can still look things up, and any write it attempts is blocked and logged.
Can my own backend call Aiwyn Tax too?
Yes. The same Aiwyn Tax connection is available over REST and through the Arc0 proxy, so your product and your agent share one connection per user.
Plug Aiwyn Tax into your agent.
Your users connect Aiwyn Tax once, under your brand. Your agent gets 10 actions behind your policies, with every call on the record.
Free to build · MCP + REST · Audit log on every plan