serial_send

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

Annotations already declare non-read-only, non-idempotent and destructive, and the description adds genuine context by disclosing that CRLF is appended by default (explaining the append_newline default). However, it says nothing about the destructive implications of sending arbitrary text to a console (e.g. interrupting a bootloader or feeding input to a live shell), which is exactly what the destructiveHint warrants explaining.

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?

One front-loaded sentence with zero filler; the format and default behavior are stated up front. It is efficient, though brevity here edges toward under-specification for a destructive write tool.

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?

An output schema exists, so return values need not be described. But for a destructive, non-idempotent three-parameter mutation with 0% schema coverage, the description omits prerequisites (connection state), the meaning of vm_name, and any warning about the effect of injecting text into a live console.

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 description coverage is 0%, so the description must compensate. It clarifies 'text' as UTF-8 and confirms the append_newline default of CRLF, but 'vm_name' is never explained — notably whether the VM must already have an attached serial connection.

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?

States a specific verb (write), the payload format (UTF-8 text) and the exact target (attached COM1 serial console), which is enough to separate it from serial_read and serial_connect. It does not explicitly distinguish itself from console_type_text, which writes text via the VM keyboard, so sibling differentiation is only partial.

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?

There is no when/when-not guidance: nothing says a connection must first be established (serial_connect exists as a sibling) or when to prefer this over console_type_text. The only implied usage comes from the phrase 'attached COM1 serial console', which an agent must infer.

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