# www.openaccountants.com — accounting and tax services — 1 of 5

Home > Browse > By type > business > www.openaccountants.com

> Probe-verified (tier 2 of 3). Last checked 2026-09-26. 1 of 5 capability checks passed. 2 unknown.

- host: www.openaccountants.com
- url: https://www.openaccountants.com/
- category: accounting and tax services
- type: business
- language: en

## Probe-verified · tier 2 of 3

Probed live on 2026-09-26 against rubric v1.2. 1 of 5 checks passed. 2 unknown.

- UNKNOWN — Markdown negotiation (`Accept: text/markdown`)
- UNKNOWN — Markdown twin at a predictable URL (`/page.md`)
- FAIL — llms.txt (`/llms.txt`)
- FAIL — API catalog (`RFC 9727`)
- PASS — MCP server card answers (`/.well-known/mcp/server-card.json → tools/list`)

MCP tools (from tools/list on 2026-09-26): list_skills, get_skill, get_skill_sections, search_skills, search_rules, get_deadlines, list_rule_facets, start_help, start, list_jurisdictions, list_verifiers, validate_vat_number, check_audit_exemption, share_with_openaccountants

## Summary

Open-source library of 1,700+ accountant-verified and source-cited tax computation skills for AI agents, covering income tax, VAT/GST, payroll, formation, and cross-border tax tasks across 240+ jurisdictions worldwide.

## Context

32 sites in this index share the category "accounting and tax services"; 5 are transactional.

## How we grade

- tier 1 — **Declared**: The site says agents are welcome in its robots.txt. A permission, not a capability.
- tier 2 — **Probe-verified** (this site): We fetched the site and tested each signal ourselves. Dated, repeatable, re-checked on a schedule.
- tier 3 — **Behaviourally verified**: An agent completed the action end to end — booked, bought, submitted — and it worked.

## About this record

Known Good probes sites live and publishes what was tested and when.
Method: https://knowngood.sh/about.md · Rubric: https://knowngood.sh/benchmark

How we found this site: probe discovery. This site didn't declare agent access — we found it by checking the open web. Everything above was tested the same way, against the same rubric, on the date shown. [How we choose what to check, and how to opt out](https://knowngood.sh/bot)

## Where this sits

- business: https://knowngood.sh/type/business
- accounting and tax services: https://knowngood.sh/category/accounting-tax-services
- financial services (also in): https://knowngood.sh/category/financial-services
- AI agents (also in): https://knowngood.sh/category/ai-agents
- Browse: https://knowngood.sh/browse
- Rubric: https://knowngood.sh/benchmark