Single tool 'execute_skill_action' has a vague, marketing-focused description that does not explain what the tool actually does or when to use it. Input schema is minimal (single string parameter with no format/constraint guidance). No output schema documented, the tool returns a JSON echo with no structure definition for downstream agents. No error handling guidance, no parameter validation rules, no security considerations. The tool name uses 'execute' (generic verb) rather than a domain-specific action like 'route_call' or 'process_dtmf'. The description conflates multiple concerns (voice agents, audio streaming, verification) without clarity on what this specific tool does. Baseline: A+ tools average 194 chars in description and 72 chars per param; this tool has ~120 chars description and ~60 chars param description, but lacks actionable detail.

• Rename tool to a domain-specific verb_noun: 'route_call', 'process_dtmf_digit', or 'transfer_call' to clarify intent.
• Rewrite description as: 'Route an incoming SIP call to an agent or department based on DTMF input. Accepts a JSON payload with call_id, digit, and destination. Returns routing decision and SIP URI for transfer. Use this after detecting DTMF tones in an active call.'
• Define 'query_payload' as a JSON object with typed fields (call_id: string, digit: string, destination: string) rather than a free-form string. Add enum constraint for digit: ['0'-'9', '*', '#'].
• Document output schema: {status: 'success'|'error', action: 'route'|'transfer'|'repeat', target_agent?: string, sip_uri?: string, error_message?: string}.
• Add error handling: return {status: 'error', error_message: 'Invalid digit: must be 0-9, *, or #', recovery: 'Repeat the prompt'} for invalid input.