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

Annotations already declare readOnlyHint=false, destructiveHint=false, idempotentHint=false, so the safety profile is covered. The description adds that it returns the minutes and issue and constrains to a single timer, but it does not disclose behavior when no timer is running or whether a repeated stop errors out.

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?

Compact and front-loaded: purpose and return values come first, followed by the two optional parameters. No filler, though the parenthetical and workspace tangent are dense in one run.

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-optional-parameter mutation with no output schema, the description covers the key return (minutes + issue) and both parameters. It stops short of describing failure modes (no active timer) but is otherwise sufficient to invoke correctly.

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 both parameters, and it does: `note` is explained as an optional record of what was done, and `workspaceId` as the target workspace with a pointer to list_workspaces and a stated default to the credential's workspace. This meaningfully compensates for the empty 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?

States a specific verb+resource ('Para TU reloj' / stop your timer) and adds that it returns the imputed minutes and the issue, which clearly distinguishes it from start_timer. The parenthetical 'el único que puedes tener' clarifies the single-timer constraint. It does not explicitly name the sibling it excludes, keeping it just below a 5.

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?

Usage is implied (you stop a timer you previously started) but there is no explicit when/when-not guidance or comparison to start_timer or log_time. The note 'list_workspaces los enumera' does helpfully route the agent for the workspace dimension, but that is parameter guidance, not tool-selection guidance.

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