Loading ToolBench
Test, validate, and scaffold MCP servers. ESLint + Lighthouse for the Model Context Protocol.
mcp-mint provides 13 tools across browser automation, database, filesystem, and REST API domains. Tool naming follows verb_noun convention (navigate, screenshot, extract_text, click, evaluate, get_links, query, list_tables, list_files, read_file, fetch_data) which is good. However, descriptions are inconsistent in depth and quality. Most tools have basic descriptions (10-50 chars), falling below the 50-200 char baseline for LLM-optimized descriptions. Input schemas are present and use Zod validation with type definitions, but parameter descriptions vary widely, some are detailed, others minimal. Output schemas are not explicitly documented in tool definitions; responses are returned as JSON text blobs without structured type declarations. Error handling exists but is generic ('failed: <error message>') without recovery guidance or error classification. No tool annotations (readOnlyHint/destructiveHint) despite clear risk distinctions (READ_ONLY vs WRITE). The 'click' and 'evaluate' tools are destructive but lack confirmation patterns or dry-run support.
Add two numbers together
Click an element on the page
Echo back the input message
Run JavaScript in the page context
Extract all visible text from the current page
Fetch data from the configured API endpoint
Extract all links from the current page
List files in a directory
Destructive tools (click, evaluate) lack confirmation or dry-run patterns. No tool annotations (destructiveHint) to signal irreversible operations to LLMs.
Output schemas not documented. Tools return JSON text blobs without explicit field type declarations. LLMs cannot reliably extract structured data or plan downstream calls.
Error handling is generic and non-actionable. Errors return raw messages without recovery guidance, error classification (retryable/user-fixable/fatal), or suggestions for next steps.
| Scored | Grade | Overall | Spec posture | Rubric |
|---|---|---|---|---|
| 2026-09-23 | F | 47 | 2026-07-28+ | v2 |
List all tables in the database
Navigate to a URL
Execute a read-only SQL query against the database
Read a file's contents
Take a screenshot of the current page
Parameter descriptions are inconsistent and often minimal (under 50 chars). 'selector' in click/extract_text lacks format guidance (CSS selector syntax). 'script' in evaluate lacks safety warnings or timeout behavior.
No pagination support documented for list_tables, list_files, get_links. Large result sets could exhaust context window. No limit parameter or total count in responses.