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

Annotations only say readOnlyHint=false, destructiveHint=false, idempotentHint=false, which leaves the effect profile ambiguous for a dispatcher. The description resolves this well: 'Listing schemas does not edit media; dispatch inherits the selected operation's effects', plus the note that dispatch uses the same gates, charges and errors as a direct call. It does not mention rate limits or result-size behavior, which is the only real gap.

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?

Front-loaded with the return value, then mode-by-mode behavior, then the safety caveat last. Four dense sentences with no filler, though the compressed 'describe=[names]' / 'call={name, arguments}' phrasing is slightly telegraphic and reads more like schema shorthand than prose.

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 three-mode meta-tool with a nested object parameter and no output schema, the definition covers mode selection, freshness of returned schemas, project_id consistency, and inherited side effects. It omits what a pure listing returns (domain names only vs. summaries) and the existence of the domains filter, which are minor for correct invocation.

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 description explains the shape and intent of describe and call (including that dispatched calls obey the same project_id rule), which the schema largely already states. The fourth parameter, the domains filter, is never mentioned in the description, so an agent must read the enum in the schema to understand it. With 75% schema coverage, this is adequate but adds only modest meaning beyond the structured fields.

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?

Names three concrete modes with specific verbs and resources: return current tool domains and schemas, retrieve named schemas via describe, and dispatch an operation via call. This is unmistakably a meta/catalog tool, so an agent can separate it from the concrete operation siblings (add_element, list_assets, etc.) 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?

Explicitly frames the use case as reaching 'capabilities absent from a client's cached catalog' and tells the agent which mode to pick (describe for schemas, call for dispatching). It implicitly contrasts with a direct tools/call by saying dispatch goes 'through the same authorization and execution path as a direct request', though it never states outright 'prefer the direct tool when it is in your catalog'.

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