Update Inbox Thread Reply State

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

The description adds some behavioral context by mentioning 'using its current reply_version,' hinting at optimistic locking. However, no details are given on version mismatch behavior or the implications of the three reply states. Annotations already indicate idempotentHint=true, but the description does not exceed what annotations provide.

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, well-formed sentence that efficiently conveys the tool's purpose and a key parameter. It is not overly long, though it could be split into two sentences for clarity.

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 tool has 5 parameters (4 required) and an output schema, the description is too terse. It does not explain the reply queue concept, the effect of state changes, or what the output contains. The output schema may cover return values, but the description should still provide high-level context.

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 40% (only id and idempotency_key have descriptions). The description mentions 'reply_version' but does not explain other required parameters like thread_id or the meaning of reply_state enum values. The contribution beyond the schema is minimal.

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 action (Resolve, suppress, or reopen), the resource (reply-queue thread), and the key parameter (reply_version). It distinguishes this tool from siblings like shipmail_reply_to_inbox_thread by focusing on state updates rather than sending replies.

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 guidance is provided on when to use this tool versus alternatives such as shipmail_reply_to_inbox_thread or state-changing tools. The description lacks any context about prerequisites or exclusions.

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