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

Annotations already indicate destructiveHint=true and idempotentHint=true. The description adds value by explaining the exact behavioral effect: 'Already-collected content stays; nothing new arrives from it.' This goes beyond the annotations in detailing what is preserved and what changes.

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 extremely concise sentences. The first sentence states the primary purpose clearly, and the second adds essential nuance. No wasted words. The structure is front-loaded and efficient.

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 the low complexity (one required parameter, no output schema, simple behavior), the description covers all necessary aspects: what the tool does, its effect on existing vs. new content, and the required input. No gaps remain.

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 single parameter feed_id has 100% schema coverage with a description referencing get_source. The description does not add any extra details about the parameter, so it does not improve upon the schema. Baseline 3 is appropriate.

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 action ('Remove an RSS feed from a topic inbox') and adds the nuance that already-collected content stays while new content stops. This distinguishes it from similar operations like delete_source which might remove everything.

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 clearly implies when to use the tool: to stop new content from a specific feed without losing existing content. However, it does not explicitly state when not to use it or mention alternatives like delete_source for complete removal, which would make it even clearer.

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