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

Annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false, so the safe read-only nature is covered by structured data. The description adds nothing beyond that: no note on pagination semantics, ordering, rate limits, or what the history records represent.

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 waste, which is appropriate for a simple read tool. It is efficient but borders on under-specification rather than true conciseness.

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 read-only historical query whose annotations cover the safety profile and whose schema fully documents the six parameters, the description is minimally adequate. It omits any sense of what the insurance fund history contains or its ordering, which would help an agent interpret results.

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%, with every parameter (from/to timestamps, page, limit, business, currency) documented in the schema itself. The description adds no meaning beyond the schema, 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 verb (get) and resource (spot insurance fund history) scoped to a currency, so an agent understands the operation. It does not, however, explicitly distinguish itself from the near-identical siblings cex_dc_list_dc_insurance_ledger and cex_fx_list_fx_insurance_ledger, leaving the spot-vs-derivatives boundary to inference from the name.

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?

The description offers no when-to-use, when-not-to-use, or alternative guidance. It never tells the agent how this differs from the dc/fx insurance ledger siblings or what preconditions (valid currency, business type) apply.

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