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

Annotations already declare destructiveHint=true, idempotentHint=false, and openWorldHint=true, so the safety profile is covered. The description adds only the precondition that the batch is paused; it does not explain what resuming actually triggers (e.g., remaining sends, billing impact, irreversibility), which is the context an agent most needs for a destructive batch operation.

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?

A single front-loaded sentence with zero waste. It is appropriately terse, though the terseness leaves no room for the effect/precondition detail a destructive action warrants.

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?

With rich annotations, a fully described single parameter, and no output schema, the definition is minimally complete for invoking the tool. It falls short on what an agent needs to predict the outcome of a destructive, open-world resume operation — no mention of resulting sends, cost, or error behavior for non-paused batches.

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?

There is one parameter and schema coverage is 100%, with "id" documented as "Batch id", so the baseline is 3. The description adds nothing about where to obtain the batch id or its format, but the schema already carries that burden.

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 and resource ("Resume a paused batch") and adds the precondition that the batch must be paused. It is clearly distinguishable from cancel_batch and pause_batch, though it never mentions retry_batch, the closest ambiguous sibling.

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 by the word "paused" — the agent can infer this applies to paused batches, but there is no explicit when-to-use guidance and no routing between resume_batch, retry_batch, and send_batch for different batch states.

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