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

No annotations are provided, so the description carries the full behavioral burden. 'List' implies a non-mutating read, but it says nothing about pagination semantics (limit/offset with a 500 cap), the default page size, or whether a total count is returned — real gaps for a paginated list tool. It does add the useful fact that results come from a registry and include metadata.

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 tight sentences with the action and filters front-loaded; no filler. Slightly less than full marks only because the filter list partly duplicates the schema.

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 output schema and no annotations, the description should cover return shape and pagination behavior. It covers purpose and filters adequately but leaves an agent guessing about result size, ordering, and how to page through a large registry.

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%, so all seven parameters are already documented in the schema (including enums for provider and category). The description adds little beyond echoing five of them and omits limit/offset entirely, so baseline 3 is appropriate.

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+resource ('List oracle feeds from the registry') and enumerates the filter dimensions, which matches the schema. It is distinguishable from read-heavy siblings like get_feed_health or get_oracle_price, though it never explicitly names a sibling to route against.

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 second sentence gives implied usage ('discovering available feeds and their metadata'), which is enough to pick the tool for discovery, but there are no when-not conditions and no named alternatives such as get_symbols or get_coverage for overlapping lookups.

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