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

The description adds significant behavior beyond annotations: it explicitly states it is read-only, does not store email or PII, requires no auth, and explains what is returned (episodes_url, matched_so_far). This aligns with annotations and enriches them with operational details.

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 three sentences, front-loads the primary purpose, and every sentence adds essential information: what it does, what it returns, and its safety/access profile. No redundant or filler content.

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 simple tool with 2 parameters and no output schema, the description fully covers the return format (episodes_url, matched_so_far), security (no PII), auth (public), and usage context. It is complete and self-contained.

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%, but the description adds crucial meaning by clarifying that the email parameter is not stored and is informational only. This addresses potential privacy concerns beyond the schema's simple 'optional' note, adding value for an agent.

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 resolves a podcast-feed URL for subscribing to automatically receive new Declassified cases, which is a specific verb+resource. It also distinguishes itself from generic subscription tools by explicitly targeting Declassified content and listing compatible podcast apps.

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 provides clear context for when to use the tool: when a user wants to subscribe to Declassified cases via a podcast feed. It doesn't explicitly name alternatives or exclusions, but the context is sufficient to infer appropriate usage.

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