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Arc & Ledger Tax Reference
com.arcandledger/tax-tools in the official MCP registry.
Endpoint https://mcp.arcandledger.com/directory/mcp. Source: github.com/Bgenc48/arc-ledger-mcp.
The registry describes it as: Read-only US tax reference for notices, deadlines, filing screens, and clearly labeled estimates.
We read its 13 tools on 2026-10-26. Nothing in them matched our tool-poisoning rules. It also sets server instructions, text a client puts in front of the model on connect; those were read too.
A clean read means these rules found nothing, not that the server is harmless. A server can change its tools at any time, which is why the index reads it again every week.
Tools it advertises
decode_irs_notice check_resolution_options estimate_irs_penalty explain_tax_document deadline_calendar check_fbar_fatca check_treaty_withholding check_itin_eligibility check_5472_obligation estimate_quarterly_taxes estimate_accountable_plan estimate_augusta_rule estimate_rental_income
Run this server? Show the check in your README
The badge reflects the latest weekly read: 
[](https://lazaretto.dev/mcp-registry/com-arcandledger-tax-tools)How this was checked
Lazaretto connects to the endpoint the way any MCP client does, asks the server to introduce itself and list its tools, and reads every name, description, parameter schema and server instruction for tool poisoning: hidden directive blocks, orders to read local secrets, parameters built to carry secrets or the conversation out, orders that redirect another server's tools, and invisible characters. It never calls a tool. What we found across the registry.
To run the same check every time Claude Code adds a server, install the free lazaretto-guard plugin. Browse every server in the index.