take_screenshot

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

Annotations already declare readOnlyHint=true and openWorldHint=false, so safety is covered. The description usefully adds that the result is a PNG image, which matters because there is no output schema. However, it says nothing about where the image is written, whether it is returned inline, or how fullPage/selector interact.

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 no filler; the capture target and output format come first. It is efficiently sized, though extremely terse given the tool's three parameters.

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?

With no output schema and 33% parameter coverage, the description should say more about the returned artifact (inline data vs. file path) and the fullPage/selector precedence. It partially compensates by naming the PNG format, but an agent still lacks enough to invoke it confidently in all cases.

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 33%: targetId is documented in the schema but fullPage and selector are not. The description implicitly covers two of three parameters ('selected page' ≈ fullPage, 'one matching element' ≈ selector), which is marginal added value over the schema but does not compensate for the undocumented fullPage behavior.

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 (Capture) and resource (selected Typora page or one matching element) plus the output format (PNG), so the agent knows exactly what the tool produces. It does not differentiate itself from nearby siblings such as typora_snapshot or get_dom, which an agent might reasonably confuse for a visual capture.

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 guidance on when to use this tool versus typora_snapshot, get_dom, or get_element, nor any prerequisite noted (e.g. that targetId comes from typora_status). The phrase 'selected Typora page' is also undefined, leaving the agent to infer what 'selected' means.

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