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

Annotations already declare readOnlyHint=false and destructiveHint=true, so the safety profile is known. The description adds a genuinely useful auth prerequisite ('requires send scope') but says nothing about what rejection actually does to a message, or how partial failures within a batch of up to 100 IDs are handled.

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 short sentences, zero filler, with the operation stated first and the permission requirement second. Nothing is padded or restated from the schema.

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 destructive bulk tool with full schema coverage and safety annotations, the definition covers operation and authorization. The one meaningful gap is batch behavior on partial failure, which matters for a destructive call accepting up to 100 IDs.

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%, with the action enum and message_ids bounds (1–100, UUID format) fully documented, so the baseline is 3. The description's 'multiple messages at once' reinforces the array parameter's bulk semantics, lifting it slightly above baseline.

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 pair (approve/reject) and the resource (multiple messages), with 'at once' making the bulk scope explicit and implicitly differentiating it from the single-message siblings approve_message and reject_message. It does not name those alternatives, but the plural/bulk framing is clear enough for selection.

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?

Usage is only implied: the agent can infer this is the batch form of approve/reject, and 'at once' suggests using it for many IDs. There is no explicit statement of when to prefer this over the single-message tools, nor any precondition beyond the scope note.

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