observe_responsive_session

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

Annotations only cover readOnlyHint and openWorldHint. The description adds real behavioral context the annotations lack: it does not reload the page, it persists one PNG per viewport size, and it returns status/URLs/recent console and network events. It does not disclose where screenshots are written or any rate/size limits, so it falls short of a 5.

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 dense sentences: the first front-loads the core behavior and return payload, the second enumerates the opt-in flags. No filler, though the flag list could be tighter.

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 no output schema, the description correctly covers the return shape (PNGs, status, URLs, console/network events) and three of the five flags. The gaps are fullPage semantics and explicit guidance on choosing this tool over siblings.

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 only 20% (5 params), so the description must compensate. It usefully explains dom (accessibility tree), audit (layout review) and returnImages (inline screenshots), but says nothing about fullPage, and sessionId's meaning lives only in the schema.

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 ('Observa las pantallas abiertas'), plus concrete outputs (PNG per size, status, URLs, console/network events). The 'sin recargarlas' qualifier distinguishes it from navigate_responsive_session and interact_responsive_session, though it never names a sibling 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?

Implies usage via 'sin recargarlas' (observe without disturbing the page) and explains what each optional flag unlocks. However, it gives no explicit when-to-use/when-not guidance and never contrasts itself with check_responsive or the other session tools, leaving routing to inference.

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