start_auto_send

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

With no annotations, the description carries the full burden, yet says nothing about what happens if a loop is already running, whether the previous send is overwritten or errors out, whether the loop survives disconnects, or how to view what was sent. Only the bare fact of timed repetition is disclosed.

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?

A single well-formed sentence with no padding, but it is too terse for a stateful action tool rather than overly wordy.

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?

A state-mutating loop-starter with no annotations, no output schema, and half its parameters undocumented needs much more: start/precondition behavior, interaction with stop_auto_send, and what the call returns. The definition leaves an agent guessing on all three.

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 50% and the description adds no parameter meaning at all. 'port' and 'hex_mode' have no descriptions anywhere, so the agent cannot tell whether hex_mode changes how the 'data' string is interpreted or whether interval_ms must be positive/non-zero.

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 ('start sending') and behavior ('repeatedly on a timer'), which is enough to distinguish it from the one-shot sibling send_serial_data. It does not name the serial-port domain explicitly, but the required 'port' parameter makes that evident.

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?

No guidance on when to choose this over send_serial_data, nor any note that stop_auto_send is the counterpart that ends the loop. The contrast with repeated sending is only implied by the word 'repeatedly'.

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