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

Without annotations, the description explains the read-only nature, the prepaid pass concept, bearer token usage, and what the listing includes. Missing rate limits or auth details but adequate for a list endpoint.

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?

The description is somewhat verbose but every sentence adds value. It is well-structured, starting with the concept and ending with the listing contents.

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 output schema, the description specifies the fields returned (tier, duration, price, routes) and explains the authentication mechanism, making it complete for correct usage.

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?

No parameters, so schema coverage is 100%. The description adds significant meaning beyond the empty schema by explaining the subscription concept and token mechanism.

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 lists subscription plans with tier, duration, price, and authorized routes. It distinguishes from sibling subscribe tools by explicitly positioning it as a prerequisite.

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 instructs to read this before calling any sygnl47_subscribe_* tool, providing clear context and alternative tools.

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