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Unofficial read-only MCP server for the wFirma API v2: invoices, contractors, expenses, payments.
About
Unofficial read-only MCP server for the wFirma API v2: invoices, contractors, expenses, payments.
Security Report
Well-designed read-only MCP server for wFirma API with strong security foundations. Credentials are properly managed via environment variables, all operations are read-only, and input validation is thorough. Minor code quality observations around error handling breadth do not significantly impact security posture given the server's limited scope and intentional design constraints. Supply chain analysis found 1 known vulnerability in dependencies (0 critical, 1 high severity). Package verification found 1 issue.
7 files analyzed · 6 issues found
Security scores are indicators to help you make informed decisions, not guarantees. Always review permissions before connecting any MCP server.
Permissions Required
This plugin requests these system permissions. Most are normal for its category.
What You'll Need
Set these up before or after installing:
Environment variable: WFIRMA_ACCESS_KEY
Environment variable: WFIRMA_SECRET_KEY
Environment variable: WFIRMA_APP_KEY
How to Install
Add this to your MCP configuration file:
{
"mcpServers": {
"io-github-agente-dev-wfirma-mcp": {
"env": {
"WFIRMA_APP_KEY": "your-wfirma-app-key-here",
"WFIRMA_ACCESS_KEY": "your-wfirma-access-key-here",
"WFIRMA_SECRET_KEY": "your-wfirma-secret-key-here"
},
"args": [
"-y",
"wfirma-mcp"
],
"command": "npx"
}
}
}Documentation
View on GitHubFrom the project's GitHub README.
wFirma MCP
Unofficial, read-only MCP server for the wFirma API v2
(api2.wfirma.pl). Gives MCP-compatible AI assistants typed, read-only access
to company data, invoices, contractors, expenses, and payments — with
credentials that never leave your machine and no commercial middleware between
you and wFirma.
Not affiliated with wFirma. "wFirma" is a trademark of its respective owner.
Tools (9, all read-only)
| Tool | Endpoint |
|---|---|
wfirma_list_companies | GET /user_companies/find |
wfirma_list_invoices | GET /invoices/find |
wfirma_get_invoice | GET /invoices/get/{id} |
wfirma_list_contractors | GET /contractors/find |
wfirma_get_contractor | GET /contractors/get/{id} |
wfirma_list_expenses | GET /expenses/find |
wfirma_get_expense | GET /expenses/get/{id} |
wfirma_list_payments | GET /payments/find |
wfirma_get_payment | GET /payments/get/{id} |
Every company-scoped tool requires the internal companyId returned by
wfirma_list_companies. A Polish NIP is not accepted as a company id.
Why read-only
The server intentionally contains no add, edit, delete, send, fiscalization,
KSeF, or payment-mutation operation. The full list of excluded categories,
reviewed against the official documentation at
doc.wfirma.pl, is recorded in
coverage-manifest.json. If you need writes, use
wFirma's own tooling — not this server.
Setup
Credentials
wFirma API keys are created in your wFirma panel (Integrations → API). Required environment variables:
WFIRMA_ACCESS_KEYWFIRMA_SECRET_KEYWFIRMA_APP_KEY
See .env.example. Never commit real values.
Build
pnpm install
pnpm build # → dist/index.js (self-contained esbuild bundle)
pnpm test # all HTTP traffic is mocked; no live account needed
Claude Desktop / any stdio MCP client
{
"mcpServers": {
"wfirma": {
"command": "node",
"args": ["/absolute/path/to/wfirma-mcp/dist/index.js"],
"env": {
"WFIRMA_ACCESS_KEY": "your-access-key",
"WFIRMA_SECRET_KEY": "your-secret-key",
"WFIRMA_APP_KEY": "your-app-key"
}
}
}
}
Claude Code / Cursor (scope: project)
claude mcp add wfirma -- node /absolute/path/to/wfirma-mcp/dist/index.js
Design notes
- No runtime dependencies beyond the MCP SDK and zod. The client uses
Node's stdlib
httpswith a hard 20s timeout and a bounded response-size guard. - Fail-closed error taxonomy. Missing credentials, non-numeric company
ids, oversized responses, and auth failures each raise a distinct
wfirma_*error code instead of a generic failure. - No PII in logs. Tool parameters are never logged.
- Coverage manifest.
coverage-manifest.jsonmaps every tool to its endpoint, risk class, and the test that proves it; a CI test enforces the manifest stays in sync with the source.
License
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