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

Annotations already declare non-read-only, idempotent, non-destructive behavior. The description adds two real traits beyond them: partial update (only passed fields change) and pre-save validation of a new rss_url (http/https, public host). It doesn't cover failure behavior or permissions.

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 short, front-loaded fragments with zero filler. The operation set leads, semantics follow, prerequisite last.

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 5-param mutation with full schema coverage and annotations carrying the safety profile, this is nearly complete: it explains partial updates, the id source, and URL validation. No output schema exists, so return-value detail is not owed.

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 description coverage is 100%, so the schema documents all five parameters (including the rss_url validation note). The description's 'only the fields you pass change' adds meaningful update semantics, but otherwise mostly restates the schema, so baseline 3 applies.

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?

States four specific operations (pause, resume, rename, re-point) against a single named resource (station), clearly distinguishing it from siblings like add_station, remove_station, and preview_station.

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?

'Get station ids from list_stations' gives the prerequisite, and 'Only the fields you pass change' establishes partial-update semantics. It stops short of explicit when-not guidance or naming an alternative for deletion/pausing workflows.

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