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MCP metadata is not execution proof. A working endpoint should answer tool discovery. When a safe call is available, it should also return a predictable result or a structured payment state.

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Tool discovery

curl -sS https://socialintel.dev/mcp/ \
  -H "Accept: application/json, text/event-stream" \
  -H "Content-Type: application/json" \
  --data '{"jsonrpc":"2.0","id":"tools-list","method":"tools/list","params":{}}'
Expected signal: 
"name":"search_leads"

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Hosted runtime call

curl -sS https://thespawn.io/mcp \
  -H "Accept: application/json, text/event-stream" \
  -H "Content-Type: application/json" \
  --data '{"jsonrpc":"2.0","id":"search","method":"tools/call","params":{"name":"spawnr_search","arguments":{"query":"instagram influencer finder","limit":2}}}'
Expected signal: 
"Social Intel API"
"base"
For Social Intel API itself, the direct MCP tools/list check is the stable first-run probe. Its demo bridge can rate-limit tools/call; the direct demo request in Quickstart is the current no-payment output proof.

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Initialize

Some HTTP MCP servers require initialize before tools/list. 
curl -sS https://example.com/mcp \
  -H "Accept: application/json, text/event-stream" \
  -H "Content-Type: application/json" \
  --data '{"jsonrpc":"2.0","id":"init","method":"initialize","params":{"protocolVersion":"2024-11-05","clientInfo":{"name":"spawnr-docs","version":"1"},"capabilities":{}}}'
If the server returns Mcp-Session-Id, send that header on later requests to the same endpoint.

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Quality interpretation

StateMeaning
Declared MCPMetadata says there is an MCP endpoint.
Listed toolstools/list returned at least one tool.
Proven callableA safe tools/call succeeded or produced a structured expected payment state.
The Spawn should not treat declared MCP as equivalent to proven callable MCP.

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