send_message

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

Annotations already declare the safety profile (readOnlyHint=false, destructiveHint=false), so the bar for additional disclosure is lower. The description adds the 'existing thread' precondition, implying failure for unknown thread IDs, but it does not disclose side effects such as appending to conversation history or error behavior.

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 10-word sentence with zero filler, front-loaded with the action verb. Nothing is redundant or extraneous.

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 two-parameter tool with no output schema, the description is close to adequate and implicitly identifies both inputs. However, it never states what the tool returns (e.g., the model's reply) or error conditions, which matters more given that no output schema exists to carry that burden.

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, but it only loosely maps 'text prompt' to text and 'existing' to threadId. The schema property names are already self-explanatory, and the description adds no format, length, or usage details beyond them.

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') with a specific resource and scope ('text prompt to an existing Freebuff thread'), making the operation unmistakable. It is clearly distinct from the sibling read-only tools (freebuff_status, list_projects, list_threads).

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 explicit when-to-use or when-not-to-use guidance is provided, and no alternative tools are named. The intended context is implied by contrast with the list/status siblings, but the description never states prerequisites like 'obtain threadId via list_threads first' or excludes other send/update tools.

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