Single tool 'execute_skill_action' has a basic description but critically lacks proper schema documentation, parameter descriptions, and output schema. The tool definition is inferred from client.py rather than explicitly registered in mcp_server.py. Input parameters (service_name, canary_weight_pct) have types and defaults but NO descriptions explaining their purpose or constraints. No output schema is documented despite returning a complex object with 5+ fields. Error handling is absent. The server code itself is a stub that only prints a JSON status message, it does not actually implement MCP protocol message handling, tool invocation, or request/response cycles.

• Implement proper MCP protocol message handling in mcp_server.py: parse incoming JSON-RPC requests, dispatch to tool handlers, and return structured responses. Use the official MCP Python SDK or implement the full request/response cycle.
• Add descriptions to all input parameters. Example: 'service_name (string, required): Name of the microservice being evaluated (e.g., auth-gateway, billing-engine). Used to identify metrics and deployment targets.' and 'canary_weight_pct (integer, 1-100): Percentage of production traffic routed to the canary deployment. Typical range 5-20% for safe rollout.'
• Document the complete output schema with field descriptions and types. Example: '{service_name: string, canary_weight_pct: integer, metrics_comparison: [{metric: string, baseline_ms/baseline_pct: number, canary_ms/canary_pct: number, verdict: enum[HEALTHY|DEGRADED|CRITICAL]}], gate_decision: enum[PROMOTE_CANARY_TO_100_PERCENT|HOLD_CANARY|ROLLBACK_CANARY], rollback_triggered: boolean, release_confidence_pct: number}'
• Add error handling with recovery guidance. Document failure modes: 'If metrics are unavailable, return gate_decision=HOLD_CANARY with error details. If service_name is not found, return actionable error: "Service 'xyz' not found. Available services: auth-gateway, billing-engine, user-service."'
• Add parameter constraints and validation. Specify: service_name must be 1-64 alphanumeric characters; canary_weight_pct must be 1-100 (not 0 or >100). Include these in both parameter descriptions and schema validation.