Type

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

With no annotations provided, the description carries full burden for behavioral disclosure. It only reveals the 'character by character' typing behavior, but omits critical details such as whether the tool waits for the element to appear, whether it clears existing text, what happens on timeout, or how it handles missing elements. This is insufficient for a tool with 10 parameters.

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 description is a single sentence, which is concise and front-loaded with the action. However, it is so brief that it omits important context, making it under-specifying rather than efficiently complete. It earns its place but leaves gaps that could be filled with a second sentence.

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?

Given the tool's complexity (10 parameters, no output schema, no annotations), the description is far from complete. It does not explain prerequisites (e.g., a page must be open), interaction with the browser daemon, or how timeouts are handled. The schema provides parameter details, but the description should offer higher-level context for an agent to invoke the tool correctly.

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 high (90%), so the baseline is 3. The description adds value by clarifying that the element can be targeted 'by CSS selector or snapshotRef', which goes beyond the schema's individual parameter descriptions. However, it does not explain the other 8 parameters (browser, connect, headless, etc.), so the added semantic value is minimal.

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 clearly states the verb 'Type into an element' and specifies the method 'character by character', which distinguishes it from sibling tools like dev_browser_fill (which types instantly) and dev_browser_click. It also names two targeting methods (CSS selector or snapshotRef), making the tool's purpose specific and actionable.

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?

No guidance is provided on when to use this tool versus alternatives like dev_browser_fill or dev_browser_click. There are no exclusions, preconditions, or context about when typing character by character is preferred. The description leaves the agent to infer usage without explicit direction.

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