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

Annotations already declare readOnly, idempotent, non-destructive, closed-world, so the safety profile is covered. The description adds a genuine scope constraint — only published targets, no industry performance data — which helps an agent avoid misinterpreting coverage. It doesn't discuss pagination or result shape, though the schema/output schema carry that.

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?

Labeled sections (Purpose/Guidelines/Limits/Ex) make it scannable and front-loaded with the resource description. Slightly template-like and the trailing no-arg example call is low value, but nothing is padded excessively.

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 full schema coverage, an output schema, and clear purpose/limits, an agent has what it needs to invoke this correctly. The only minor gap is that return/pagination behavior is left entirely to the output schema and offset description rather than being summarized in the tool description.

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 all five parameters (limit, offset, keyword, language, response_format) are documented in the schema, including enums and defaults. The description adds no parameter-level detail beyond what structured fields already provide, 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 resource (battery recycling targets) and enumerates the exact contents: recycling efficiency, material recovery rates, collection rates, plus effective years. It also distinguishes itself from the timeline siblings via the 'rather than dates' clause, so an agent can route correctly without opening schemas.

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?

Explicitly says when to use it ('target/efficiency questions rather than dates') and states a boundary ('published targets only, no industry performance data'). It does not name the specific alternative tool (e.g. get_battery_regulation_timeline) by name, but the routing condition is clear.

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