set_gps_nmea_custom_commands

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

No annotations are provided, so the description bears full responsibility. It mentions the value type [UINT8] and default, but lacks details on persistence, side effects, or whether setting triggers immediate action. The phrase 'send to the GPS module on init' implies delayed effect but is vague.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is a single sentence with a supplementary type/default note, immediately stating the action and constraint. Every word serves a purpose, with no redundancy.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given the tool's simplicity (one parameter, no output schema, no annotations), the description is mostly adequate. It covers purpose and usage constraint, but lacks detail on value formatting or error conditions, leaving minor gaps.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

With 100% schema coverage, the schema already documents the parameter. The description adds a default indicator '[UINT8, default: —]' beyond the schema, though the default value is ambiguous. It does not clarify expected format (e.g., valid NMEA sentence), so baseline 3 is appropriate.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the tool sets custom NMEA sentences to send to the GPS module on initialization, explicitly limiting to NMEA provider only. This effectively distinguishes it from other set_gps_* sibling tools like set_gps_auto_baud.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description specifies when to use (on init) and the provider restriction (NMEA only), providing clear context. However, it does not offer explicit exclusions or alternatives compared to other GPS configuration tools, so it misses full guidance.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.