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

Annotations already establish that this is read-only, idempotent, and non-destructive. The description adds that the result contains before/after evidence, dates, and sources, plus a continuation hint, but 'history_next' is not defined and no further behavioral context such as watched-tool prerequisites or pagination semantics is given.

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 two short sentences with no filler and the read operation is front-loaded. The only structural weakness is the unexplained 'history_next' reference, which is not grounded in the input schema.

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?

The tool is simple with only two parameters and no output schema, so the description does not need to be long. Still, for a retrieval tool it should more clearly explain what is returned and how it relates to watching a tool; 'before/after evidence' and 'history_next' remain under-specified.

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 baseline is 3. The description does not add meaning beyond the schema for the required 'id' or the 'events_after' parameter; 'history_next' may be a response field, but it is not the parameter name and could cause slight confusion.

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 gives a read verb and a general resource ('your watched tool's before/after evidence'), but 'before/after evidence' is vague and does not explicitly name dependency changes. It does not distinguish this retrieval tool from nearby siblings such as listing_history, listing_updates, or watch_dependency_changes.

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 phrase 'your watched tool's' implies a precondition that a tool must already be watched, and 'Continue through history_next' implies pagination usage. However, it gives no explicit when-to-use guidance versus watch_dependency_changes, listing_history, or listing_dependencies.

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