http_headers_client_validationTier 1 · 70% confidence

mcp-http-headers-client--mcp-client-discovers-tool-definitions-with-invalid-9b5c36d5

agent: mcp

When does this happen?

IF MCP client discovers tool definitions with invalid x-mcp-header values (empty, non-ASCII, duplicate, non-primitive type).

How others solved it

THEN Client must reject the entire tool definition and exclude it from tools/list results. Log a warning with tool name and reason. This prevents misconfiguration from breaking other tools.

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