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

Annotations only declare readOnlyHint=true, so the description adds real value by specifying that everything is resolved locally and that 'No Merkl API, RPC, or indexer request' is made, plus that preparation scope is bounded by the verified chains. It does not discuss caching, staleness of the local catalog, or what happens for an unverified chain_id, which keeps it short of a 5.

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?

One front-loaded sentence returns the resource first and the constraints afterward, with no filler. The phrase 'how Merkl's reward fields behave' is slightly abstract but is the only soft spot in an otherwise tight definition.

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?

Return values need no explanation since an output schema exists, and the readOnly annotation covers safety, so the description's remaining burden is scope and locality, both of which it addresses. Only the missing pointer to the reward-preparation tools it feeds leaves a small gap.

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 a single optional parameter and the schema already documents it at 100% coverage ('Optional chain to check against the verified Merkl Distributor catalog'). The description's mention of verified chains echoes rather than extends that, so no meaning is added beyond the schema.

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 ('Locally return') and names exactly what comes back: the Merkl Distributor address, the chains it is verified on, and how Merkl's reward fields behave. That is enough to tell it apart from sibling deployment tools such as get_aerodrome_deployment and get_lido_deployment, though it never explicitly contrasts itself with them.

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?

'preparation is limited to those chains' implies this is a setup/verification step preceding Merkl reward preparation, but the description never names prepare_merkl_claim or any alternative, and never states when not to call it. The usage context is inferable rather than stated.

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