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

Annotations already declare the safety profile (readOnlyHint, idempotentHint, destructiveHint=false, openWorldHint), so the bar is lower. The description does add real context beyond them: the call is validated, limited (quota/rate implied), billed, and returned identically to a direct tool call. It does not say what happens on an invalid or unknown tool name, or how validation failures are surfaced.

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 sentences, front-loaded with the action and followed by the behavioral contract. The phrase 'answered exactly as a listed tool would be' is slightly vague but carries the important equivalence guarantee, so no sentence is wasted.

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 generic dispatcher with a free-form nested arguments object, no output schema, and open-world behavior, the description covers the execution model and billing but omits error/validation failure behavior and any guidance on tool-name resolution. Adequate to call it, incomplete for handling failures.

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 coverage is 100% and both parameters are documented in-schema, including the crucial pointers to catalog__search and catalog__describe. The description adds only 'with its arguments', which slightly reinforces the nested-object pass-through but contributes little beyond the schema. Baseline would be 3, nudged to 4 because the schema's cross-references are genuinely load-bearing and the description's 'validated' wording implies the arguments are checked against the target tool's contract.

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 and resource: run a catalog tool with its arguments. It implicitly distinguishes itself from catalog__search and catalog__describe by being the execution step, but it never names those siblings explicitly, so the agent has to infer the dispatch role from the schema's parameter descriptions.

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 through the schema references ('Tool name, from catalog__search', 'per catalog__describe'), which does sketch a discovery-to-execution workflow. It never says when to prefer catalog__call over invoking a concrete sibling like ua_law__search directly, nor when not to use it, which is the central ambiguity for a meta-dispatch tool.

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