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

Beyond the readOnly/idempotent annotations, the description adds two genuinely useful behavioral facts: schema_hash identifies the page version (enables change detection between calls), and labels are untrusted content whose embedded instructions should be treated as data (prompt-injection warning). Return shape and size are not described, but annotations already cover the safety profile.

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 action-oriented lead clause is front-loaded and the two trailing sentences each carry a distinct point (version hash, untrusted labels, alternative tool). The middle enumeration is dense and item-heavy but every listed element is a real page construct the agent will encounter.

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 carries the burden of describing returns and does so by enumerating the page constructs it covers. It omits error/edge conditions (no task, page not yet loaded, schema absent) which would complete the picture for a single-parameter inspection tool.

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?

Only one parameter exists and the schema documents it fully at 100% coverage ('Task id from alterlab_task_start'), so the schema does the heavy lifting. The description's mention of schema_hash is a return-value note rather than added meaning for task_id, so the baseline 3 applies.

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 names the exact resource (the task's current page schema) and enumerates the payload concretely: form fields, submit/next/back actions, login and challenge state, tables, cart lines. It also names the sibling it differs from (alterlab_task_observe for a text snapshot), so an agent can pick between them without opening a schema.

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?

It gives explicit timing guidance ('before acting') and routes the agent to alterlab_task_observe when a raw text snapshot is wanted. It stops short of stating when this tool is unnecessary or what to do if the page schema is empty or the task is not ready.

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