profile_settings

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

With no annotations, the description carries the full burden and does well: it discloses partial-update semantics, the side effect that sites may detect forced dark colors, the Chrome-engine restriction, and the delayed effect ('takes effect the next time the identity starts'). It omits permission/auth requirements, which is the main remaining 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?

Front-loaded summary sentence, then clearly delimited Args and Returns sections where every line adds information. Slightly long for a two-parameter tool, but no sentence is filler.

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, and the description supplies the return shape ('{name, launch} with the launch settings now stored'). Combined with the partial-update and delayed-effect notes, an agent has everything needed to call this 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 compensate and does: 'name' is pinned to the exact format profiles_list reports, and 'force_dark' is defined with its True/False semantics, the default of off, its visual consequence, and its platform restriction. Nothing about either parameter is left ambiguous.

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 and resource: 'Change a display setting of an existing identity', and clarifies it mutates launch settings of an already-created profile. An agent can distinguish it from profile_create and profile_checkup, though no sibling is named 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?

'Only the settings you pass are changed; everything else in its launch settings stays as it is' clearly frames this as a partial update. It also gives real exclusions for force_dark (Chrome-engine identities only, reserve for identities the user manages themselves, effective at next start), but never states when to prefer this over the other profile_* tools.

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