# FastBill MCP by usefulapi (io.usefulapi/fastbill): tool descriptions scored

- tools/list taken: 2026-11-02 (UTC)
- From: [Official MCP Registry](https://registry.modelcontextprotocol.io/v0/servers/io.usefulapi%2Ffastbill/versions/latest)
- Connected to: https://fastbill.usefulapi.io/mcp
- Homepage: https://usefulapi.io/fastbill/
- Repository: https://github.com/m190/usefulapi-mcp
- Scoring rules: v2
- Tools: 22
- Average: 43.0 / 100 (Cloudy)
- Near-identical pairs: 0

This page shows how FastBill MCP by usefulapi (io.usefulapi/fastbill)'s tool descriptions scored, the issues found and the names of its tools and parameters. The descriptions are the server's own: read them where the copy came from.

Forecall asked the URL this server lists in the official MCP Registry for its tools/list once, on the date above, without calling any tool. The server may have changed since.

## Across the server

No server-wide issues.

## Tools

- `fastbill_create_article`: 35 / 100
  - Major: Says nothing about when to use it, or when not to.
  - Major: Arguments without a description: title, unit_price, type, description, unit, currency_code, vat_percent, tags.
  - Minor: Says nothing about what it returns.
- `fastbill_list_estimates`: 35 / 100
  - Major: Says nothing about when to use it, or when not to.
  - Minor: Arguments without a description: customer_id, estimate_id, estimate_number.
  - Minor: String arguments with no constraint or example: start_date, end_date.
  - Minor: No `required` list, so every argument is optional.
  - Minor: The description mentions none of its 3 or more arguments.
  - Minor: Says nothing about what it returns.
- `fastbill_list_expenses`: 36 / 100
  - Major: Says nothing about when to use it, or when not to.
  - Minor: Arguments without a description: invoice_id, invoice_number.
  - Minor: String arguments with no constraint or example: start_date, end_date, start_paid_date, end_paid_date.
  - Minor: No `required` list, so every argument is optional.
  - Minor: The description mentions none of its 3 or more arguments.
  - Minor: Says nothing about what it returns.
- `fastbill_list_revenues`: 36 / 100
  - Major: Says nothing about when to use it, or when not to.
  - Minor: Arguments without a description: customer_id, invoice_number.
  - Minor: String arguments with no constraint or example: start_date, end_date, start_paid_date, end_paid_date.
  - Minor: No `required` list, so every argument is optional.
  - Minor: The description mentions none of its 3 or more arguments.
  - Minor: Says nothing about what it returns.
- `fastbill_list_articles`: 37 / 100
  - Major: Says nothing about when to use it, or when not to.
  - Minor: Arguments without a description: article_id, article_number.
  - Minor: No `required` list, so every argument is optional.
  - Minor: The description mentions none of its 3 or more arguments.
  - Minor: Says nothing about what it returns.
- `fastbill_list_projects`: 37 / 100
  - Major: Says nothing about when to use it, or when not to.
  - Minor: Arguments without a description: project_id, customer_id.
  - Minor: No `required` list, so every argument is optional.
  - Minor: The description mentions none of its 3 or more arguments.
  - Minor: Says nothing about what it returns.
- `fastbill_create_project`: 38 / 100
  - Major: Says nothing about when to use it, or when not to.
  - Minor: Arguments without a description: project_name, currency_code, vat_percent.
  - Minor: String arguments with no constraint or example: start_date, end_date.
  - Minor: The description mentions none of its 3 or more arguments.
  - Minor: Says nothing about what it returns.
  - Minor: Required identifiers whose description does not say where the value comes from: customer_id. Name the tool or the place that returns it, or models look it up first.
- `fastbill_create_time_entry`: 39 / 100
  - Major: Says nothing about when to use it, or when not to.
  - Minor: Arguments without a description: customer_id, project_id, billable_minutes, comment.
  - Minor: String arguments with no constraint or example: date.
  - Minor: The description mentions none of its 3 or more arguments.
  - Minor: Says nothing about what it returns.
  - Minor: Required identifiers whose description does not say where the value comes from: customer_id, project_id. Name the tool or the place that returns it, or models look it up first.
- `fastbill_get_customer`: 40 / 100
  - Major: Says nothing about when to use it, or when not to.
  - Minor: Says nothing about what it returns.
  - Minor: Required identifiers whose description does not say where the value comes from: customer_id. Name the tool or the place that returns it, or models look it up first.
- `fastbill_list_recurring_invoices`: 40 / 100
  - Major: Says nothing about when to use it, or when not to.
  - Minor: No `required` list, so every argument is optional.
  - Minor: The description mentions none of its 3 or more arguments.
  - Minor: Says nothing about what it returns.
- `fastbill_list_contacts`: 41 / 100
  - Major: Says nothing about when to use it, or when not to.
  - Minor: Arguments without a description: customer_number.
  - Minor: No `required` list, so every argument is optional.
  - Minor: Says nothing about what it returns.
- `fastbill_list_time_entries`: 43 / 100
  - Major: Says nothing about when to use it, or when not to.
  - Minor: Arguments without a description: customer_id, project_id, time_id.
  - Minor: String arguments with no constraint or example: date, start_date, end_date.
  - Minor: No `required` list, so every argument is optional.
- `fastbill_update_customer`: 43 / 100
  - Major: Says nothing about when to use it, or when not to.
  - Major: Arguments without a description: customer_type, first_name, salutation, position, academic_degree, address, address_2, zipcode, city, email, phone, mobile, website, currency_code.
  - Minor: The description mentions none of its 3 or more arguments.
  - Minor: Says nothing about what it returns.
  - Minor: Required identifiers whose description does not say where the value comes from: customer_id. Name the tool or the place that returns it, or models look it up first.
- `fastbill_get_invoice`: 44 / 100
  - Major: Says nothing about when to use it, or when not to.
  - Minor: Says nothing about what it returns.
  - Minor: Required identifiers whose description does not say where the value comes from: invoice_id. Name the tool or the place that returns it, or models look it up first.
- `fastbill_list_invoices`: 44 / 100
  - Major: Says nothing about when to use it, or when not to.
  - Minor: Arguments without a description: customer_id, invoice_number.
  - Minor: String arguments with no constraint or example: start_due_date, end_due_date, start_paid_date, end_paid_date, end_lastupdate.
  - Minor: No `required` list, so every argument is optional.
  - Minor: Says nothing about what it returns.
- `fastbill_create_customer`: 46 / 100
  - Major: Says nothing about when to use it, or when not to.
  - Major: Arguments without a description: first_name, salutation, position, academic_degree, address, address_2, zipcode, city, email, phone, mobile, website, currency_code.
  - Minor: Says nothing about what it returns.
- `fastbill_list_templates`: 47 / 100
  - Major: Says nothing about when to use it, or when not to.
  - Minor: No `required` list, so every argument is optional.
  - Minor: Says nothing about what it returns.
- `fastbill_list_customers`: 49 / 100
  - Major: Says nothing about when to use it, or when not to.
  - Minor: Arguments without a description: city.
  - Minor: No `required` list, so every argument is optional.
  - Minor: Says nothing about what it returns.
- `fastbill_set_invoice_paid`: 49 / 100
  - Major: Says nothing about when to use it, or when not to.
  - Minor: The description mentions none of its 3 or more arguments.
  - Minor: Says nothing about what it returns.
  - Minor: Required identifiers whose description does not say where the value comes from: invoice_id. Name the tool or the place that returns it, or models look it up first.
- `fastbill_create_estimate`: 50 / 100
  - Major: Says nothing about when to use it, or when not to.
  - Minor: Arguments without a description: currency_code.
  - Minor: String arguments with no constraint or example: estimate_date.
  - Minor: Says nothing about what it returns.
- `fastbill_complete_invoice`: 55 / 100
  - Minor: Says nothing about what it returns.
  - Minor: Required identifiers whose description does not say where the value comes from: invoice_id. Name the tool or the place that returns it, or models look it up first.
- `fastbill_create_invoice`: 61 / 100
  - Minor: Arguments without a description: currency_code, invoice_title, cash_discount_percent, cash_discount_days, customer_order_reference, contract_reference.
  - Minor: String arguments with no constraint or example: invoice_date, delivery_date, service_period_start, service_period_end.

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