type

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

With no annotations, the description carries the full burden, and it does disclose real behavioral risk: untrusted page content, external side effects from typing, and the need for user authorization. It stops short of disclosing what happens on a stale or invalid handle, whether text is appended or replaced, or what is returned on success/failure.

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?

Three short clauses, front-loaded with the action and then the safety constraints. It is not padded, though the safety sentences would land better after a clear statement of what element receives the text.

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?

A mutation tool with side effects, no annotations, no output schema, and zero parameter documentation. The description supplies a safety posture but omits the operational essentials an agent needs to invoke it 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 0% across three required parameters. The description implies the tab (tabId) and the text, but 'handle' — the most important parameter, presumably an element reference from read_page — is entirely undefined in both schema and description.

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?

"type in a user-granted tab" gives a verb plus a target container, which distinguishes it from siblings navigate and read_page. However, it never says what receives the typed text — the required 'handle' parameter implies a specific element, but the description leaves the agent to infer that it types into an addressed element rather than the page generally.

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?

There is no statement of when to choose this over click or navigate, and no prerequisites beyond the vague "user-granted tab". The authorization caveat is a safety note, not usage routing between siblings.

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