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

Annotations indicate the tool modifies state (readOnlyHint=false) and is non-idempotent, but the description adds minimal behavioral context beyond 'starts a chat'. It does not describe side effects, state requirements, or error conditions. Acceptable given annotations, but could be more informative.

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?

Single sentence is concise and front-loaded. However, the phrase 'or records that this side wants to chat' is somewhat redundant and could be split for clarity. Still, no wasted words.

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 absence of an output schema, the description should clarify what the tool returns or what side effects occur (e.g., whether a chat is created immediately or a request is queued). The ambiguity about 'records' versus 'starts' leaves the behavior unclear for an agent.

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% with only 'body' described. The tool description adds no information about parameters, especially the required 'matchRequestId', leaving its purpose ambiguous. The description should clarify what a match request ID represents and how to obtain it.

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 it starts a chat for a match request, which distinguishes it from sibling tools like 'send_message' or 'list_messages'. However, the addition 'or records that this side wants to chat' introduces slight ambiguity about whether it always creates a chat or just logs intent.

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 guidance on when to use this tool versus alternatives like 'send_message' or 'request_human_match'. The context of being for a match request is implied, but without exclusion criteria or prerequisites.

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