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

Annotations already declare readOnlyHint=false, idempotentHint=false, destructiveHint=false and a closed-world scope, so the safety profile is partly covered. The description adds only that the artifact is a persisted 'saved query' for ongoing monitoring; it does not say what is stored, whether duplicate watches are allowed (non-idempotent), or what happens on creation.

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?

A single front-loaded sentence with no filler. Nothing is redundant and the core action is stated immediately.

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-parameter, non-idempotent creation tool with no output schema and no schema descriptions, one sentence is not enough. Key operational facts — what the watch is bound to (agent_id/project_id), what max_results controls, and the resulting identifier — are absent.

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% across 5 parameters, so the description carries the full documentation burden. It loosely implies a query string and an evidence source, but project_id, agent_id, and max_results (including its default of 10) are entirely unexplained in both description and schema.

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 names a specific verb (Create) and resource (a saved query for evidence-change monitoring), which is clearer than the bare tool name. It distinguishes creation from sibling read/run tools like list_evidence_watches and run_evidence_watch, though it never names them explicitly.

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?

There is no when-to-use guidance, no prerequisite or authorization note, and no mention of alternatives such as create_evidence_collection or run_evidence_watch. The agent is left to infer that this is the write counterpart to the watch-listing tools.

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