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Arc & Ledger Tax Tools
io.github.Bgenc48/arc-ledger-tax-tools in the official MCP registry.
Endpoint https://mcp.arcandledger.com/mcp. Source: github.com/Bgenc48/arc-ledger-mcp.
The registry describes it as: Enrolled Agent tax tools: IRS notices, FBAR, LLC vs S-Corp, quarterly estimates & more.
We read its 21 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
triage_tax_problem decode_irs_notice check_resolution_options estimate_irs_penalty explain_tax_document deadline_calendar get_document_checklist check_fbar_fatca check_treaty_withholding check_itin_eligibility check_5472_obligation compare_llc_scorp estimate_quarterly_taxes estimate_reasonable_comp estimate_accountable_plan estimate_augusta_rule estimate_rental_income compare_formation_states check_sales_tax_nexus get_fee_quote book_consultation
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[](https://lazaretto.dev/mcp-registry/io-github-bgenc48-arc-ledger-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.