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

Annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false, and openWorldHint=false, so the safety profile is fully covered structurally. The description adds only the scoping constraint (optionally per project) and says nothing about pagination, ordering, or return volume, which is a modest but real gap.

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 well-formed sentence with zero filler, front-loading the action and the optional scoping constraint. Every clause earns its place.

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 one-parameter read-only list tool with no output schema and complete annotation coverage, the description supplies the essential scope. It would be fully complete with a brief note on return ordering/pagination or default behavior, but nothing critical to correct invocation is missing.

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 coverage is 0%, so the description must carry the parameter burden. It does convey that project_id filters results to a single project, which is real added meaning, but it gives no format or identifier-type detail (ID vs name) and no note about the default null meaning 'all projects'.

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?

Specific verb+resource: 'List saved evidence watches.' It clearly differentiates from sibling mutators like create_evidence_watch and run_evidence_watch/run_all_evidence_watches by being a read/list operation. It does not, however, explicitly name the sibling list tools (list_evidence_collections, list_evidence_events) it could be confused with.

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?

'optionally within one project' implies the filter condition for using the project_id parameter, so usage is partially implied. There is no explicit when-to-use vs alternatives such as list_evidence_collections or run_evidence_watch, and no exclusions.

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