serial_log_start

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

Annotations indicate destructiveHint=true, but the description adds specifics: creates/overwrites/appends a file, captures everything the device sends, and enforces a one-log-per-session constraint. This goes beyond the annotation's binary hint to describe actual behavior.

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 front-loaded with a one-line summary, followed by brief context and parameter details. It avoids unnecessary elaboration. A minor point: the docstring format could be tightened, but overall it's efficient and well-structured.

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 3 parameters, no output schema, and simple behavior, the description covers the essential aspects: purpose, file creation, append/overwrite behavior, and session constraints. It lacks error handling or return value info, but the tool's simplicity and lack of output schema make this adequate.

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?

Schema coverage is 0%, so description must carry the load. It explains all three parameters (file_path, session_id, append) in plain language, clarifying purpose and defaults. This compensates for the missing schema descriptions and adds value for agent use.

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?

Clear verb+resource pair: 'Start logging all received serial data to a file.' The action is starting logging, the resource is serial data directed to a file. The description also distinguishes from siblings like serial_log_stop and provides a familiar analogy (minicom's capture feature).

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?

Provides useful context: 'Only one log file per session' and session_id optional if only one session. The analogy to minicom's capture offers real-world comparison. However, it does not explicitly state when not to use this tool (e.g., if streaming to stdout is needed) or list direct alternatives among siblings.

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