Updates the proxy configuration for multiple browser profiles.

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

Annotations already declare readOnlyHint=false, destructiveHint=false, idempotentHint=false, and openWorldHint=false, so the safety profile is covered structurally. The description adds the dual-mode assignment behavior, but it does not disclose permission requirements, whether running browsers are affected, partial-failure behavior across many profiles, or rate limits — meaningful gaps for a bulk mutation.

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 bulk scope front-loaded and no filler. The second sentence largely re-expresses what the schema already says about the two proxy modes, so it is useful framing rather than strictly additive, keeping it just short of a 5.

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?

There is no output schema, so return values need not be explained, and annotations cover the non-destructive read/write profile. However, for a 5-parameter bulk mutation the description omits what happens on invalid profile IDs, whether the operation is atomic across profiles, and whether the bulk update affects other proxy settings — leaving the agent with only the minimum viable picture.

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 schema already documents profile IDs, workspace, proxyServerId, proxyContainerId, and maxProfilesPerProxy. The description restates the two proxy-assignment modes at a high level without adding format, precedence, or mutual-exclusivity detail beyond what the schema's own descriptions say — the baseline 3 for full coverage 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?

The description states a specific verb (updates), resource (proxy settings), and scope (one or more browser profiles at once), so an agent can distinguish it from siblings like bulk_update_profile_preset and bulk_update_profile_tags. It is clear, but it never names those siblings or explicitly contrasts itself with them, which is what a 5 would require.

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 only implied: the two assignment modes ('set a specific proxy server' vs 'assign proxies from a container') hint at when each path applies, but there is no explicit when-to-use, when-not-to-use, prerequisite, or alternative-tool guidance (e.g. update_proxy vs this bulk variant).

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