Stopping browser instances (bulk).

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

Annotations already declare destructiveHint=true, readOnlyHint=false, and idempotentHint=true, so the safety profile is covered. The description adds real value beyond them by explaining the effect: instances are permanently closed and their resources released. It does not say what happens to the underlying profiles or to partial failures.

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?

Two short sentences with the action front-loaded and no filler. The second sentence slightly restates the first ('stops' / 'permanently closes') but earns its place by adding the destructiveness and resource-release detail.

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?

With only two parameters, full schema coverage, and annotations carrying the safety semantics, the description supplies what is needed: bulk scope, target selection by profile UUID, and the permanent-close effect. Missing only edge-case behavior (nonexistent UUIDs, already-stopped instances), which is minor for a bulk stop.

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 body array (profile UUIDs) and workspaceId semantics are fully documented in the schema itself. The description only loosely maps to 'the specified profiles' and adds no new parameter meaning, so the baseline of 3 is appropriate.

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 ('stops'), resource ('browser instances'), and scope ('multiple ... associated with the specified profiles'). The bulk scope implicitly separates it from the singular stop_browser_instance sibling, but no sibling or contrast is named explicitly, so it falls short of full differentiation.

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 by the name and description: use this when several profiles' instances must be stopped at once. However, there is no explicit when-to-use vs. stop_browser_instance guidance, no stated prerequisites (e.g., instances must be running), and no handling guidance for invalid or non-running profiles.

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