12 tools with complete JSON schemas and descriptions. Naming follows verb_noun pattern (session_list, serial_connect, etc.). Descriptions are present but brief (avg 45 chars, below 194-char baseline). Parameters have types and descriptions. Key gaps: no output schemas documented, no error handling guidance, no pagination for list tools, no idempotency hints for write operations. Tool composition is reasonable but some tools (serial_send_text, serial_send_hex) could be unified. Missing recovery guidance in descriptions.

• Document output schemas for all 12 tools. Specify field names, types, and which fields are required for chaining (e.g., session_list should return session_id, name, status).
• Expand descriptions to 100-200 chars. Add WHEN to use, prerequisites, and error recovery hints. E.g., 'Connect to a serial port. Call serial_list_ports first to discover available ports. Returns connection status; if it fails, verify port name and baud rate match device specs.'
• Add error handling guidance to write tools (serial_connect, serial_send_text, serial_send_hex, protocol_select). Specify which errors are retryable and suggest recovery steps.
• Unify serial_send_text and serial_send_hex into a single serial_send tool with a 'format' enum parameter (text|hex) to reduce tool count and LLM decision overhead.
• Add pagination to serial_get_records: accept offset/limit parameters, document max limit (e.g., 1000), and return total_count so agents can iterate efficiently.