type

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

With no annotations supplied, the description carries the full load and does well: it discloses that existing content is replaced (an important destructive side effect), that the result is reported back for verification, and that empty input clears the field. The `secret` hint also flags sensitive-input handling. What remains unstated is failure behavior, e.g. what happens when no field matches, and any timing or focus requirements.

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?

Two compact clauses with no filler. The primary effect (replaces content) and the verification behavior are front-loaded, and the clearing edge case and `secret` rule follow immediately. Nothing could be removed without losing information.

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 four-parameter, annotation-free mutation tool, the description covers the substitute-schema gaps and the main side effect. Since there is no output schema, the phrase 'report what it shows' does some work in explaining the return value, but the exact shape of that report and error conditions are left implicit.

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 only 50%, with `text` and `secret` undocumented in the schema. The description compensates directly: it explains that `text` replaces content and that empty text clears the field, and it defines exactly when `secret` should be set (any password or code). That covers both schema gaps, leaving the already-documented `into` and `submit` to the schema.

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 gives a concrete verb and target: it puts text into a field, replaces existing content, and reports the resulting display value. That is far more specific than the bare name 'type' and distinguishes it from press/tap siblings by making clear it targets a field rather than sending raw keystrokes. It stops short of naming an alternative tool for key presses, so it sits at a solid 4 rather than 5.

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?

Two conditional rules are embedded: empty text clears the field, and `secret` should be set for any password or code. These are genuine usage directives, but there is no explicit guidance on when to choose this over `press`, `clipboard`, or `batch`, nor any stated prerequisites such as the field needing focus.

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