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

Annotations already declare readOnlyHint=true and openWorldHint=false, so the safety profile is covered. The description adds a consistent clarification that no external actions occur, but says nothing about what 'bounded' means, whether batch_size is a maximum or exact size, or how leftovers are handled — meaningful gaps for a batching tool.

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 no filler; the key distinction (no execution) is stated up front. It is efficient, though being a single fragment it leaves little room for the disambiguation the task needs.

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?

The tool is simple (2 required params, no nested objects, no output schema) and annotations cover the read-only profile, so the description is not grossly inadequate. However, with zero schema coverage on parameters and no statement of return shape (list of batches, preserved order), an agent could still invoke it incorrectly.

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 0%, so the description carries the full burden for both parameters and largely fails: 'items' is never explained beyond 'input', and 'batch_size' is entirely undefined (max, exact, or target?). Only the vague word 'bounded' gestures at constraints.

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 uses a specific verb ('Split') and resource ('a bounded input into batches') and adds a distinguishing property ('without executing external actions') that separates it from the execution-oriented sibling tools. It never names a sibling, so an agent must still infer boundaries from the phrase alone, which keeps it below a 5.

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?

There is no explicit when-to-use or when-not-to-use guidance, and no alternative tool is named. The clause 'without executing external actions' hints that this is a planning/preview step, but the agent is left to infer when planning is appropriate versus, say, action-chain or idempotency tools.

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