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smallinvoice MCP by usefulapi

by io.usefulapi
OverviewDiscussionsAdmin

Server Details

Read smallinvoice contacts, invoices, offers, projects and hours; create contacts and invoices.

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Status
Unhealthy
Uptime
0.0% over the last 24 hours
Last Tested
Transport
Streamable HTTP
URL
Repository
m190/usefulapi-mcp
GitHub Stars
0
ChatGPT
–
Claude
–

TDQS

A3.6/5.0

Scored across 27 tools

Disambiguation4/5

Most tools target a distinct resource and action, and the names are specific enough to select correctly. A few related read tools could be confused at a glance, such as list_units vs list_cost_units or list_activities vs list_efforts vs list_working_hours, but the descriptions clarify the boundaries.

Naming Consistency5/5

All tools follow the same predictable pattern: the smallinvoice_ prefix plus a snake_case verb_noun name such as create_contact, get_invoice, or list_projects. There is no mixing of camelCase, vague verbs, or inconsistent prefixes.

Tool Count2/5

With 27 tools, the surface is heavy for the apparent scope and is dominated by list/get read operations. Many tools earn their place as separate API endpoints, but the overall count feels excessive relative to the limited write coverage.

Completeness2/5

The set supports creating contacts and invoices and reading many resources, but it lacks update/delete operations for almost everything and has no write tools for offers, order confirmations, delivery notes, products, services, projects, or payments. These are significant gaps for an invoicing/accounting server where lifecycle changes and document sending are core workflows.

Tool Schema Changelog

Recent tool additions, removals, and schema changes observed during successful MCP inspections.

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