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

The description adds meaningful side-effect transparency beyond the annotations: select returns the existing thread, reject/withdraw close only that thread, and neither action closes the original Work request. This complements the idempotent and non-destructive hints with concrete behavioral nuance.

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 three sentences with no wasted words; every sentence contributes behavioral or contextual detail. The opening phrase 'Compatibility action for legacy clients' is less informative than a direct verb phrase, but the overall structure is tight and readable.

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 small three-parameter tool, the description covers decision semantics and side-effect scope, and agent_key authentication is documented in the schema. Yet there is no indication of what the tool returns, and response_id provenance is left implicit, so completeness is adequate but not thorough.

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 description explains all three decision enum values and maps them to requester/responder roles, which the bare enum does not convey. However, response_id is not described in the description, and with only 33% schema coverage the agent must infer its meaning from the name and pattern.

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 identifies the tool as a compatibility action for deciding on Work intro responses and explains the three decision outcomes: select returns the active thread, while reject and withdraw close that thread. It is specific enough to distinguish it from generic decision or send tools, though it lacks a crisp active-voice statement of the core action.

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 a usage context: it is meant for legacy clients, since new Work responses start rooms automatically. It does not name an alternative tool or explicitly state when not to use it, so the routing guidance is implied rather than prescriptive.

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