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

The readOnlyHint=true and idempotentHint=true annotations already declare safety, and the description reinforces this by saying the tool opens nothing and returns instructions. It adds useful context about the official Partner Platform API being gated and request-only, which explains why a browser-driven approach is used. It could go slightly further on what the returned steps look like when the user is on a different Thumbtack surface, but the behavioral picture is solid.

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 core guidance is front-loaded and clear, but the closing sentence about Thumbtack's gated Partner Platform API is long and digressive relative to the agent's task. It provides context for why browser automation is used, yet it dilutes an otherwise tight, actionable definition.

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 zero-parameter, read-only guidance tool with no output schema, the description covers the essentials: what it returns, that it performs no action, and which sibling tools complete the task. The API-access aside is helpful background but not strictly necessary; nothing critical to invoking the tool correctly is absent.

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?

There are zero parameters, which is the baseline-4 case, and the description correctly implies no input is needed by describing the response content instead. No parameter explanation is missing because none exist.

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?

Names a specific verb and resource ('Update weekly budget in Thumbtack') scoped to the user's own account, and explicitly states what the tool actually produces: step-by-step instructions rather than a performed update. That distinction separates it from the write siblings like thumbtack_send_quote and thumbtack_reply_to_lead.

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?

The description gives an explicit two-step workflow: call this tool to get the screens/buttons/fields, then execute with the cotlet_browser_* tools in the Cloud Browser. It also states the tool 'opens nothing by itself,' which is precisely the when-not-to-expect-effect guidance an agent needs to avoid assuming the budget changed.

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