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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint, so safety and idempotence need no restating. The description adds that the payload is configuration-like (contracts, terms, fees), but says nothing about freshness, caching, or whether the returned terms are authoritative for quoting.

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 fragments with no filler, and the imperative 'Start here' is placed last as the call-to-action. The comma-separated field list is slightly jumbled ('the rules' interleaved with concrete items), costing a bit of scannability, but nothing is wasteful.

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 no input schema fields and no output schema, the description is the only specification of what comes back, and its field list is only semi-explicit ('the rules'). For a bootstrap tool whose entire value is its return payload, the agent would benefit from knowing the shape or key sections of the response.

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?

The tool takes zero parameters, so there is nothing for the description to disambiguate; baseline 4 applies. The description correctly implies a parameterless full-snapshot read rather than a filtered query.

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 enumerates the resources surfaced (chain, contracts, loan terms, fees, rules, non-USDG lend assets), which is specific enough to distinguish this discovery tool from action-oriented siblings like gage_prepare_borrow or gage_loan. It lacks an explicit verb ('returns'/'describes') and the phrase 'the rules' is vague, so the purpose must be partly inferred.

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?

'Start here' is a direct sequencing instruction that tells the agent to call this before the other gage_* tools, which is exactly the guidance needed for a capabilities/bootstrap endpoint. It stops short of naming which sibling to call next or when to skip this tool (e.g., once cached).

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