serial_send_ctrl

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

With no annotations provided, the description carries the burden of behavioral disclosure. It only states that a control character is sent without a newline, but does not describe session effects, whether the command blocks, or any prerequisites. The schema's enum descriptions add some detail, but the tool description itself lacks behavioral depth.

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, front-loaded sentence that includes the essential information—what the tool does and a key distinguishing detail—without any redundant or filler content.

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 tool is simple (two parameters, no output schema), and the description, combined with the schema, sufficiently conveys the action and scope. Some context is missing (e.g., whether the session must already be open), but this is minor given the simplicity and the sibling tool ecosystem.

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 100%, with both parameters having clear descriptions. The key parameter's enum values are explicitly documented (e.g., c=Ctrl+C, u=Ctrl+U). The tool description adds little beyond the schema, so a baseline of 3 is appropriate; it does not compensate with additional parameter-level meaning.

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 uses a specific verb 'Send', identifies the resource 'serial shell session', and specifies the exact set of control characters (Ctrl+C/U/D/Z). It also distinguishes itself from serial_write by noting it does not append a newline, making its purpose clear and distinct.

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 implies usage for sending control characters to a serial session, but does not explicitly state when to prefer this over alternatives like serial_write or serial_exec. No exclusions or alternative tools are mentioned, so guidance is limited to what can be inferred from the tool name and description.

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