probe_token_capabilities

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

The description states it returns a report of accessible vs denied endpoints, disclosing output behavior. With no annotations provided, it carries the full burden and does so adequately, though it could explicitly note it is non-destructive (implied by 'probe').

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 concise sentences, each adding value: purpose, usage guidance, output description. No wasted words. Front-loaded with the action.

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?

Given no parameters and a simple output (accessible vs denied endpoints), the description is fully complete. It covers purpose, when to use, and what to expect. No output schema needed as description defines it.

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 has zero parameters and schema coverage is 100% by default, so the description adds no parameter information. Baseline 4 is appropriate for no-parameter tools.

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 clearly states the tool probes token capabilities against Spot.io API endpoints. It uses a specific verb (probe) and resource (token capabilities), and distinguishes well from siblings which are CRUD or operational tools.

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 description explicitly advises to call this first to understand what tools will work with the token, providing clear context for when to use it. It doesn't list when-not or alternatives, but for a diagnostic tool this is sufficient.

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