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

Annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false, and openWorldHint=true, so the safety profile is fully covered without the description's help. The description adds that the registry is 'official' and addresses are 'canonical' (a trust/authority signal), but says nothing about list volatility, caching, or registry maintenance — modest additive value over the annotation baseline.

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 sentence that front-loads the action and the scope, with the returned data named at the end. No filler, nothing repeated from the schema or annotations.

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 zero-parameter, read-only enumeration tool with an output schema covering the return shape and annotations covering safety/idempotency, the description supplies everything an agent needs to call it correctly. The remaining question of when to use it belongs to the usage dimension, not completeness.

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 presents it as an unfiltered full-list operation, consistent with the empty 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?

States a specific verb ('List') and a precisely scoped resource ('every asset in the guardrail's official Robinhood Chain registry'), plus the key returned field (canonical contract address). None of the siblings (check_token_safety, evaluate_trade, simulate_balance, verify_audit_trail) perform enumeration, so the tool is unambiguously distinguishable.

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?

Usage is only implied: an agent can infer this is the lookup to run before checking a token or evaluating a trade, but the description never says when to call it, that it is the prerequisite/discovery step, or that it takes no arguments. No alternatives or exclusions are named, so this stays at minimum-viable.

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