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

Annotations already declare readOnlyHint=true, so safety is covered. The description adds that this is a control-plane read against /v1/accounts/{account_id}/deployments, which confirms account scoping, but says nothing about pagination behavior, result size, or permissions.

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, front-loaded sentences with no filler. The endpoint path is mildly redundant but does aid debugging and confirms scope, so it largely earns its place.

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 no-output-schema list tool whose parameters are fully documented, the description covers scope and the underlying operation. The only real gap is distinguishing itself from fireworks_list_deployed_models.

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 coverage is 100%, so all four parameters (including filter and pageToken) are documented in the schema itself. The description adds no filter syntax or pagination semantics beyond that, so the baseline 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 verb and resource ('List deployments') and clarifies the domain term with '(serving instances) in the account', which helps an agent understand what a deployment is. However, it does not differentiate from the confusable sibling fireworks_list_deployed_models, so it falls short of the 5 bar.

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?

No when-to-use guidance, no prerequisites, and no naming of alternatives. The sibling fireworks_list_deployed_models is close enough in meaning that an agent could easily pick the wrong one, and the description offers no disambiguation.

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