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

Annotations already declare destructiveHint=true, idempotentHint=true, and openWorldHint=true; the description adds real value on top by disclosing the quota cap (20), the verification prerequisite, and critically that turning off preserves the saved search. It does not say what happens if the 20-cap is already hit, which keeps it off a 5.

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?

Four short sentences, front-loaded with the action, followed by quota, the verification gate, and the disable semantics. Nothing is repeated and every sentence adds a distinct fact.

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 two-parameter toggle with no output schema, the description covers the important unknowns: quota limit, verification dependency, and non-destructive disable behavior. Only the failure mode at the 20-search cap is left unstated.

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 0%, so the description must carry the load: 'for one saved search' implies a single saved_search_id and 'or stop' implies the boolean enabled toggle. That's adequate but implicit — it never states that the toggle is the enabled flag or that the ID is a UUID.

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?

Names a specific verb (email new matching jobs / stop) and a specific resource scope (one saved search, to your account email). An agent can immediately distinguish this from save_search, set_filters, and delete_saved_search without opening any schema.

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?

Gives clear operating context: up to 20 saved searches may have email on, and email only flows after account email verification. It doesn't name a sibling alternative (e.g. delete_saved_search for removing the search itself), but the on/off framing makes the when-to-use condition obvious.

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