feat(cortex): serve /mcp in stateless JSON mode (broad client compat)#103
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aingle's MCP tools are all request/response (no server-initiated notifications), so the SSE notification stream isn't needed. Stateful streamable-HTTP mode requires clients to open a GET text/event-stream channel, which some HTTP MCP clients don't, yielding 406 Not Acceptable. Stateless + json_response = plain JSON request/response, spec-compliant (MCP 2025-06-18) and compatible with more clients.
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Summary
Switches the
/mcpStreamable HTTP endpoint to stateless +json_responsemode.aingle's 25 MCP tools are all request/response (no server-initiated notifications), so the SSE notification stream isn't needed. In the default stateful mode, rmcp requires clients to open a
GET /mcptext/event-streamchannel; some HTTP MCP clients (e.g. Claude Code's local HTTP transport) don't, producing406 Not Acceptable: Client must accept text/event-stream. Stateless +json_responsereturns plain JSON request/response (spec-compliant, MCP 2025-06-18) and works with more clients.Change
StreamableHttpServerConfig::default().with_allowed_hosts(..).with_stateful_mode(false).with_json_response(true)(one config line).Verification
/mcpover HTTP returned406 ... must accept text/event-stream(stateful GET channel). After the change, Claude Code connects and drives the full tool flow (create_triple → query → signed dag_history) over HTTP.POST /mcp→200,Content-Type: application/json, noMcp-Session-Id(stateless);GET /mcp→405(no SSE channel).