observe

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

The description adds one useful behavioral note that page results stay local to the Agent, which is valuable privacy-related context. However, it does not disclose whether the operation is read-only, any side effects, or the nature of the results, so the core behavior remains largely opaque.

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?

The description is a single, non-redundant sentence, but it is so terse that it under-specifies the tool. It is concise but not appropriately sized for the information needed, bordering on under-specification rather than efficient clarity.

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 browser automation tool with siblings and no output schema, the description should clarify what output 'observe' produces and when to use it. It offers no detail on return values, side effects, or session requirements, making it difficult to invoke correctly in practice.

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?

The schema has two parameters (request_id and session_id) with zero description coverage, and the tool description does not explain either. Session_id is required but its meaning must be inferred from the name; request_id is entirely unexplained. The description fails to compensate for the lack of schema detail.

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 identifies the action as running an 'observe operation' on the local Chrome browser, but does not specify what observing entails (e.g., snapshot, accessibility tree, page state). It distinguishes itself from siblings only by the name 'observe', not by the description's content.

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?

No guidance is provided on when to use observe versus alternatives like extract or click. There are no prerequisites, exclusions, or typical use cases, leaving the agent to infer when this tool is appropriate.

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