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Taxcredit Engine MCP Server

answering

Taxcredit Engine is answering right now. Last checked 1 min ago. It exposes 5 tools. Last commit 18 Sep 2026.

Auditable US clean-energy tax-credit scenarios for 45Q, 45V, 45Y, 48E, and 45X.

Uptime history 48 days of history · worst day 99%
48 days agonow
100.0%
Uptime 24h
92 of 92 checks
5
Tools
read from the server
377 ms
Response time
average over 24h
0
Stars
last commit 18 Sep 2026

What the code does

We read the source, 22 h ago · tools taken from the live server · rules 3dff92dd89df

Capabilities

What this server is able to do. For an MCP server this is often the job itself — a terminal server runs commands because that is what it is for. Listed so you know what you are plugging in, not as an accusation.

Unsafe deserialization gateway/state_store.py:356
                state = pickle.loads(row[0])
Runs an external command mcp-publish/smoke_all.py:176
    r = subprocess.run([sys.executable, "-c", code], capture_output=True, text=True)
Page executes code built at runtime gateway/stats.html:191
  $("kpis").innerHTML = cells.map(([l,v,d]) =>
Dumps the whole environment growth-agent/growth_agent.py:512
        self.environ = dict(os.environ if environ is None else environ)

Is this your server and something here is wrong? Tell us — corrections are free and do not require a plan.

This code can reach further than it looks

We found places where it runs commands, builds paths or queries from values it is given. None of that is a flaw by itself — it becomes one when the code changes, and code changes quietly between releases. We re-read it on every one.

Three servers free · no card

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 1 min ago.

run in your terminal
claude mcp add taxcredit-engine --transport http https://mcp.viridisconservation.com/taxcredit-engine/mcp
~/Library/Application Support/Claude/claude_desktop_config.json
{
  "mcpServers": {
    "taxcredit-engine": {
      "url": "https://mcp.viridisconservation.com/taxcredit-engine/mcp"
    }
  }
}
~/.codex/config.toml
[mcp_servers.taxcredit-engine]
url = "https://mcp.viridisconservation.com/taxcredit-engine/mcp"
.cursor/mcp.json
{
  "mcpServers": {
    "taxcredit-engine": {
      "url": "https://mcp.viridisconservation.com/taxcredit-engine/mcp"
    }
  }
}
.vscode/mcp.json
{
  "mcpServers": {
    "taxcredit-engine": {
      "url": "https://mcp.viridisconservation.com/taxcredit-engine/mcp"
    }
  }
}

Available tools 5

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

rule
get_rule_pack
Return the bundled rules and official source metadata for one credit.
list_rule_packs
List supported credits and the current bundled rule-pack digest.
calculate
calculate_tax_credit
Calculate an auditable tax-credit scenario. credit is 45Q, 45V, 45Y, 48E, or 45X. facts must contain the explicit credit-specific eligibility facts; missing facts return indeterminate. This is not tax or filing advice. Price: $2.00 per call after 10 free calls/day. Pay at /x402/taxcredit-engine/calculate_tax_credit with Base USDC, cash-fund payment_ref through escrow_checkout + confirm_escrow_funding, or use /seats.
describe
describe_agent
Return fleet-standard capabilities, version, and pricing.
verify
verify_tax_credit_result
Verify an engine result's audit_sha256. Pass the prior result object as JSON; any changed amount, fact, rule step, or source digest fails.

Endpoints

URLTransportStateLatencyChecked
https://mcp.viridisconservation.com/taxcredit-engine/mcp streamable-http answering 371 ms 1 min ago

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Taxcredit Engine — questions

Answers built from our own checks of this server.

What can Taxcredit Engine do?
It exposes 5 tools, read directly from the server on our last check. Among them: calculate_tax_credit, describe_agent, get_rule_pack, list_rule_packs, verify_tax_credit_result. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →
Is Taxcredit Engine working right now?
We send a real MCP handshake every 15 minutes. Over the last 24 hours 92 of 92 checks got a reply (100.0%), average response time 377 ms. The bar chart above shows every period we have measured.
How do I connect Taxcredit Engine?
Copy the ready config from this page — we generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each with the file path that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.
Does Taxcredit Engine need an API key?
No. Taxcredit Engine completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 5 of them are readable on this page. This is what we observed, not what the docs claim.
How fast is Taxcredit Engine?
It answers our handshake in 377 ms on average, which is faster than 41% of all working MCP servers we measure. The comparison comes from our own checks across the whole registry, every 15 minutes.
Is Taxcredit Engine open source?
We cannot say either way: written in Python, 0 stars on GitHub and 1 open issue, but we could not determine the licence, and without one the code is not open source by default.