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MCP server for serial port communication with 25 tools, resources, prompts, request cancellation, and stdio or streamable HTTP transports.
serial-mcp demonstrates solid definition quality with comprehensive tool coverage (25 tools) and explicit JSON schemas for most inputs. Tool names follow verb-noun convention well (list_ports, open, close, write, read, etc.). Descriptions are present and moderately detailed. However, there are gaps in parameter annotations, some output schemas are not fully documented, and error handling descriptions lack recovery guidance. The server handles a safety-critical domain (serial communication) which requires higher rigor, some tools like delete_profile and clear_log would benefit from confirmation patterns. Schemas are defined using serde + schemars, which is appropriate for Rust.
Capture initial boot output from a serial port
Clear log entries for a connection
Close an active serial port connection
Compute checksum of data using various algorithms
Configure server-wide settings
Delete a saved connection profile
Export logs to a file
Destructive operations (delete_profile, clear_log) lack confirmation or dry-run patterns. No description explains the consequences of deletion or recovery options.
Tool descriptions lack recovery guidance for error cases. E.g., 'Open a serial port connection' does not explain what to do if the port is already open, permission denied, or port not found.
Output schemas not fully documented in source. While tools return structured JSON via Json<T>, the exact field names and types for read, get_status, and list_profiles responses are inferred from Rust types but not explicitly shown in the provided code sample.
Inferred effective spec: 2026-07-28+.
| Scored | Grade | Overall | Spec posture | Rubric |
|---|---|---|---|---|
| 2026-09-23 | C | 69 | 2026-07-28+ | v2 |
Flush read/write buffers on a serial port
Retrieve log entries for a connection
Get status of a serial port connection
List active serial port connections
List available serial ports with detailed information
List available connection profiles
Open a serial port connection with specified configuration
Open a serial port using a saved profile
Read data from an open serial port
Reconfigure an open serial port connection
Reconnect to a previously open serial port
Rollback to a previous profile version
Save current connection as a profile
Send a break signal on the serial port
Set DTR (Data Terminal Ready) and RTS (Request To Send) control lines
Set flow control mode (none, software, or hardware)
Perform a write-read transaction on a serial port
Write data to an open serial port
Parameter constraints for numeric fields lack explicit ranges. E.g., baud_rate accepts any integer but should document valid values (300-921600); max_bytes and timeout_ms lack bounds.
Permission gates not mentioned. Tools like delete_profile, clear_log, and reconfigure can alter state; descriptions do not clarify permission requirements or audit trail implications.
Some tool names could be more specific. 'configure' is generic, does it set server-wide timeout, log level, buffer size, or all of them? 'configure' vs 'set_server_settings' or 'update_config' would be clearer.
Port identifier handling ambiguous. Tools accept 'port' as string (e.g., /dev/ttyUSB0, COM3) but descriptions don't explain how agents should discover valid port names or handle missing ports.