serial_write

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

The description discloses the behavioral effect of concurrent access on the output buffer, which is a valuable warning. However, with no annotations provided, the description carries the full burden but does not cover other important behaviors like default buffer clearing (clear flag), error handling, or return 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 entire description is two sentences: the first states the purpose, the second a critical warning. It is front-loaded, concise, and every word earns its place.

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?

For a simple write operation, the description provides the essential purpose and a concurrency caveat. However, it does not mention what the function returns (or if it returns anything), nor does it explain relationships with sibling tools, leaving some gaps for a tool with no annotations and no output schema.

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?

All three parameters are fully described in the input schema with 100% coverage, including the clear flag's purpose and default. The description does not add any additional meaning beyond what the schema already provides, so it meets the baseline for high schema coverage.

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 verb 'Send' and the resource 'a command to a serial shell session', which distinguishes it from reading or executing on the serial console. It is specific and actionable, though it does not explicitly compare to sibling tools like serial_exec.

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 only usage guidance is a negative warning about concurrency with serial_exec/serial_read. It does not explain when to use serial_write versus alternatives such as serial_exec or serial_send_ctrl, nor does it provide context like prerequisites or typical use cases.

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