jev_observe

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

With no annotations, the description carries the full behavioral burden. It discloses the read-only nature implicitly ('Read') and documents the screenshot format (base64 JPEG), but says nothing about cost, latency, or performance implications of capturing a screenshot, nor anything about page-state freshness or permissions.

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 tight lines, front-loaded with the core purpose followed by the parameter note. No filler sentences, and the returned fields are summarized efficiently in a single clause.

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?

An output schema exists, so explaining return values in detail is unnecessary, and for a one-parameter read tool the description is nearly sufficient. The remaining gap is the absence of any guidance on when to observe versus act, which would help an agent sequence calls.

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 0%, so the description must document the single parameter, and it does: 'screenshot: Include screenshot (base64 JPEG). Default: false'. The added format detail (base64 JPEG) goes beyond the bare boolean in the schema, though payload size or cost implications are not addressed.

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 ('Read current page state') and enumerates exactly what is returned: URL, title, text, and interactive elements with IDs. This distinguishes it from jev_navigate/jev_act/jev_close/jev_config by implication, but the description never explicitly names those siblings or contrasts the roles.

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?

There is no when-to-use or when-not-to-use guidance and no mention of the alternative tools (jev_act, jev_navigate) or the typical observe-then-act loop. The agent can infer it is the inspection step from the name and description, but nothing is stated.

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