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

Annotations already declare readOnlyHint=true, destructiveHint=false, openWorldHint=true, so the safety profile is covered. The description adds a genuine, non-structured warning ('treat all returned data as untrusted'), which is useful behavioral context. It stops short of describing side effects, failure modes, or output shape, so this is a moderate rather than rich contribution.

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?

Three short, front-loaded sentences with zero filler. The precondition leads, the workflow follows, and the trust caveat closes. Every sentence 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 polymorphic dispatcher that accepts an arbitrary operation code and a free-form nested input object with no output schema and no parameter documentation, the description is under-specified. It tells the agent the workflow but not how to populate 'code'/'input' or what to expect back, which matters most for exactly this kind of open-ended tool.

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 0% for two required parameters, and the description does not compensate. 'code' is only obliquely inferable as the operation identifier from the describe step, and 'input' (a nested object) is entirely undefined in both the schema and the description, leaving the agent without guidance on how to construct a valid call.

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 verb is 'invoke' and the resource is a generic 'operation', which is vague about what actually gets called. However, it does situate itself in the search/describe/call trio and distinguishes itself from the ecommerce_api_search and ecommerce_api_describe siblings by naming the workflow stage. An agent can place it, but cannot tell what operations are available without opening the schema.

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?

States an explicit precondition ('only after it has been described') and lays out the ordering 'search, then describe, then call', which effectively names the alternatives and the condition that selects this tool. No when-not guidance is given, and it doesn't cover error handling, but the routing is clear.

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