streamelements_open

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

With no annotations, the description carries the full behavioral burden. It does disclose a valuable trait the schema cannot: the page opens in the user's already signed-in Cloud Browser, so authentication state is inherited. It does not say whether this navigates the current page or a new tab, what happens if a page is already open, or what is returned on success.

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?

One sentence, front-loaded with the action and destination, with no filler. The parenthetical default is slightly redundant with the schema but does not bloat the 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 one-optional-parameter navigation tool with no output schema and no annotations, the description covers purpose and auth context adequately. It leaves open what the agent gets back after opening the page (e.g., page content or state) and how this interacts with a previously open page, which matters for chaining into the click/type 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 description coverage is 100% and the single optional url parameter is fully documented there. The description only restates the default URL, which duplicates the schema rather than adding format or constraint detail, 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?

States a specific verb (open) and resource (a StreamElements page in the signed-in Cloud Browser), plus the default URL and the downstream intent (list/edit chat commands). This clearly separates it from siblings like streamelements_read, streamelements_click, and streamelements_close, though it never names them 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?

The phrase 'to work with list and edit chat commands' implies when this tool is appropriate, but there is no explicit when-not guidance and no routing to alternatives such as streamelements_read for reading content or streamelements_guide for help. Usage is inferable rather than stated.

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