joist_open

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

With no annotations, the description must carry the behavioral load. It usefully discloses the auth context (a signed-in Cloud Browser session) and the default landing page, which are not in the schema. It does not say whether an already-open page is navigated or a new one created, whether an error occurs if not signed in, or what the tool returns.

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?

A single front-loaded sentence with the verb and target first, then the purpose. The default URL appears in both the description and the schema, which is slightly redundant but not distracting. Nothing else is wasted.

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 simple one-optional-parameter tool with no output schema, the description covers what it does and where it lands by default. It leaves open the post-open behavior (does it return page state, require an existing session, or affect subsequent joist_click/joist_type calls), which matters for a stateful browser-navigation tool in a six-tool family.

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 100% and the single optional url parameter already documents its default, so the description adds no syntax or format detail beyond what the schema provides. The description merely restates the same default URL, which is mild reinforcement rather than new meaning. 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 uses a specific verb ("Open") plus a concrete resource ("a Joist page in your signed-in Cloud Browser") and names the default target domain. It also scopes the intent ("to work with estimates, invoices and clients"), so an agent can tell it apart from joist_click or joist_read. It stops short of explicitly contrasting itself with joist_close, which is the natural sibling pair.

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?

Usage is implied rather than stated: you open a page when you need to work with estimates, invoices, or clients. The "signed-in Cloud Browser" phrase hints at a prerequisite session, but there is no explicit when-to-use/when-not guidance or mention of alternatives such as joist_read for reading content without opening a page.

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