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

The annotations already declare readOnlyHint=true, destructiveHint=false, and openWorldHint=false. The description goes beyond them by enumerating the domain-level side effects that are explicitly NOT performed: access creation, API invocation, provider execution, billing enablement, and publisher network requests. That is useful, non-redundant reassurance for an agent worried about triggering real provider actions, though it does not describe the response shape.

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 resource identified first and the safety boundary second. The 'Private draft:' prefix is mildly distracting metadata rather than tool guidance, but the rest is front-loaded and waste-free.

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?

An output schema exists, so return-value detail is unnecessary, and the no-side-effect profile is well covered. The remaining gap is routing: with many reference/discovery siblings, the description never tells an agent why to pick this one, leaving selection ambiguous.

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 the baseline is 4. Nothing in the description is needed to explain inputs, and it correctly presents the tool as a parameterless reference lookup.

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 description states a concrete verb and resource: it returns 'ToolYour's canonical read-only API and MCP reference.' That is more specific than a restatement of the name. It does not, however, contrast itself with close siblings like get_tool_schema or discover_tools, so an agent must infer the difference.

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?

There is no statement of when to call this instead of get_tool_schema, discover_tools, or list_categories, all of which plausibly return reference-like metadata. The 'Private draft' framing and mention of 'usage boundary' hint at scope but give no selection criteria.

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