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

Annotations already declare readOnlyHint=false and destructiveHint=false, so the mutation/safety profile is covered. The description adds real context beyond that with 'requires write scope,' an auth prerequisite the annotations do not convey, but it omits the consequences of each transition (e.g., whether closing is reversible or what happens to an already-closed conversation).

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?

Two tight sentences with the operation front-loaded and the prerequisite trailing, with no filler. Slight redundancy in re-listing the enum values already present in the schema keeps it from a 5.

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 simple two-parameter mutation with full schema coverage, no nested objects, and no output schema, the definition covers the operation, the changed field, and the permission requirement. The remaining gap is transition semantics (whether archived/closed states can be reverted), a minor omission at this complexity level.

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 100%, so both parameters and the status enum are already fully documented in the schema. The description repeats the enum values but adds no new meaning about the id format or transition rules, so the baseline of 3 applies.

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?

States a specific verb ('update') and resource ('a conversation') plus the exact field being changed ('status'), with the three legal values enumerated. It is easily distinguished from siblings like update_campaign or create_conversation, though it does not explicitly contrast with get_conversation or mark_conversation_read.

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 only usage signal is the prerequisite 'requires write scope,' which is genuinely useful but is an authorization note rather than when-to-use guidance. There is no statement of when this is preferred over alternatives such as create_conversation or mark_conversation_read, so the agent must infer context.

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