write_serial

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

Without annotations, the description adds value by clarifying that the tool never executes host commands and only writes bytes to the UART transport. However, it omits details on error handling, timeout behavior, and what 'bounded' means. Partially transparent.

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?

Four sentences, each with a clear purpose: purpose, resolution method, safety disclaimer, optional params. No fluff, though could group parameter notes more efficiently. Efficiently sized.

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?

The output schema exists, reducing need to describe returns. However, the description lacks guidance on baudrate and timeout semantics, and does not explain success/failure indicators. Adequate but incomplete for a 5-parameter tool.

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 the description shoulders the burden. It explains 3 of 5 parameters (port, append_newline, and implicitly text with 'bounded UTF-8') but leaves baudrate and timeout_seconds unexplained. Adds moderate value beyond parameter names.

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 'write' and the resource 'UART of connected board', with qualifiers like 'bounded UTF-8 text' and references to sibling tool 'read_serial' to differentiate. It precisely conveys what the tool does.

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 provides guidance for optional parameters (port override, append_newline for line-oriented input) but does not explicitly state when to use this tool over alternatives like write_memory or write_core_register. Usage context is implied but not directive.

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