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

Annotations already declare readOnlyHint, idempotentHint and destructiveHint=false, so 'no setting is changed' largely restates them. The genuinely additive item is 'Free', which tells the agent no credits are charged — a cost trait annotations do not express. Nothing is said about freshness/caching of the state hash or access requirements.

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 sentences, front-loaded with the returned fields, then the safety/cost note, then a doc pointer. No filler and nothing repeated from the title.

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?

There is no output schema, so the description carries the return-value burden — and it does list the four returned fields. The additional field documentation is delegated to the referenced resource URI, which is a reasonable pointer but leaves detail out of band.

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 tool takes zero parameters, so there is nothing to disambiguate; baseline applies. The description correctly does not invent parameter discussion.

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 a specific verb ('Read') and enumerates exactly what is read: enabled status, paid-through date, monthlyCredits, state hash. This clearly separates it from the mutation sibling soclo_ads_watch_set, though that sibling is never named, so the differentiation is inferred rather than explicit.

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?

No explicit statement of when to call this versus soclo_ads_watch_set, soclo_ads_watch_ask_first_read, or soclo_ads_watch_auto_pause_read. Usage as a pre-check before a write is only implied by the 'read'/'set' naming pair.

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