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

Beyond the annotations (readOnlyHint=false, destructiveHint=false), the description reveals important behavioral traits: the message must be sent verbatim, the reply must be presented verbatim with no preamble/postamble, and the tool can return a turn_id indicating asynchronous work. This is rich, non-obvious context that an agent needs to behave correctly.

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?

Three sentences with no wasted words. The main action is front-loaded, followed by the response formatting rule and the fallback to check_pally. Every sentence earns its place.

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?

For a single-parameter tool with no output schema, the description covers the full invocation flow: what to send, how to present the response, and what to do if Pally is still working. The mention of turn_id is sufficient given the sibling check_pally will presumably accept it. Nothing essential is missing.

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?

The schema already fully documents the single 'text' parameter with 100% coverage. The description adds meaning by emphasizing that the text must be the user's message 'verbatim' and 'unchanged,' which is not explicit in the schema description. This extra guidance elevates it slightly above the baseline.

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 states a specific verb and resource: 'Send the user's message to Pally verbatim and return Pally's reply.' It also clarifies the exact output behavior (present reply verbatim as entire response), making the tool's purpose unmistakable. It distinguishes itself from the sibling check_pally by describing when to use each.

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 gives explicit usage context: 'While the user is conversing with Pally, send each new user message through this tool unchanged.' It also provides the alternative condition: 'If Pally is still working, call check_pally with the returned turn_id.' This clearly routes the agent between this tool and its sibling.

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