Free platform to test MCP clients without installing anything. Create mock tools with dynamic templates, configurable delays, conditions (if/then), and response sequences. Supports JSON-RPC 2.0 over Streamable HTTP. Built-in text_echo and json_echo tools. Rate-limited tiers: anonymous (5 calls/min, 1 mock tool), registered (10 calls/min, 4 mock tools), premium (60 calls/min, unlimited). Zero setup — no install, no registration required. More info: https://www.testmcp.dev
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Scored across 2 tools
The two tools are clearly differentiated by input type (JSON vs. plain text), so an agent can select based on the data format. However, they execute essentially the same echo operation, which introduces mild ambiguity for mixed or uncertain inputs.
Both tools follow a consistent verb_noun pattern (json_echo, text_echo), using lowercase with underscores. The naming is predictable and uniform.
With only 2 tools, the server sits at the low end of the acceptable range. For a simple echo service, this is reasonable, but it feels thin compared to the typical 3-15 tool scope.
The server covers the two most common echo formats (JSON and plain text), but lacks a generic echo or additional formats (e.g., XML, binary). Minor gaps exist, but the core purpose is addressed.
Recent tool additions, removals, and schema changes observed during successful MCP inspections.
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