Test deployment. Not for any maintained production.
A deliberately tiny, risk-free MCP server for learning how MCP directory listings work.
Repository: https://github.com/mikej345/hello-mcp
No network calls, no API keys, no user data. Every tool is read-only and pure. Runs over both MCP transports: stdio (for "runs from source" listings) and Streamable HTTP (for "hosted endpoint" listings).
Scored across 3 tools
add_numbers, get_rule_of_thumb, and get_server_time each cover a completely different operation: arithmetic, random advice, and time/health. There is no overlap or plausible way to confuse one tool with another.
All three tools follow a consistent snake_case verb_noun pattern: add_numbers, get_rule_of_thumb, get_server_time. The verbs clearly indicate the action and the nouns clearly identify the target, making the set predictable.
Three tools is a reasonable, small size for a demo-style server and avoids bloat. However, the operations are unrelated, so the set feels more arbitrary than intentionally curated.
There is no coherent domain or lifecycle against which to judge completeness; the tools are isolated, self-contained utilities. For a server named 'hello,' the lack of a greeting or hello-style operation is also a notable gap.
Add two numbers and return the sum.
Inputs: a (required), b (required). Returns: result
Return one random engineering rule of thumb. Takes no input and has no side effects.
Inputs: no named parameters. Returns: result
Return the server's current time in UTC (ISO 8601). Useful for checking the server is alive.
Inputs: no named parameters. Returns: result
Recent tool additions, removals, and schema changes observed during successful MCP inspections.
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Add one secure layer between your agents and this server.