serial_send

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

With no annotations provided, the description carries the full burden of behavioral disclosure. It mentions that the tool can 'optionally wait for and return response,' which hints at I/O behavior, but fails to detail critical aspects like error handling (e.g., what happens if the connection is invalid), side effects (e.g., whether it modifies port state), or performance traits (e.g., blocking nature during response waiting). For a tool with potential side effects and no annotation coverage, this is a significant gap.

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, efficient sentence that front-loads the core action ('send data to a serial port') and appends the optional behavior. Every word earns its place with zero waste, making it highly concise and well-structured.

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?

Given the complexity of a serial communication tool with no annotations and no output schema, the description is insufficient. It doesn't explain the return format (e.g., what the response looks like), error conditions, or dependencies on other tools like serial_connect. For a tool that performs I/O operations with multiple parameters, more context is needed to ensure safe and effective use.

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%, so the schema fully documents all six parameters. The description adds no parameter-specific information beyond what's in the schema, such as explaining the interaction between 'raw' and 'line_ending' or clarifying 'connection_id' usage. Baseline 3 is appropriate when the schema handles all parameter documentation.

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 specific action ('send data to a serial port') and resource ('serial port'), distinguishing it from siblings like serial_read, serial_expect, or serial_wait_for. It also mentions the optional response behavior, which adds specificity beyond basic sending.

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 by mentioning the optional response behavior, suggesting it's for sending data with possible feedback. However, it lacks explicit guidance on when to use this tool versus alternatives like serial_expect (which might involve pattern matching) or serial_read (for reading without sending), and doesn't specify prerequisites such as needing an established connection via serial_connect.

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