Place many items

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 traits: one undo step for the whole batch, pixel units, and that coordinates are kept inside the picture bounds (clamping). It does not say whether existing points are repositioned or new ones are created, what happens with an invalid zone or corner index, or what the call returns. Those omissions matter for a mutation tool with zero annotation coverage.

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 short sentences with the operation, batching, and undo scope front-loaded. The trailing fragment 'Picture pixels; kept inside the picture' is terse to the point of being cryptic, but every element carries information and nothing is padded.

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 no-annotation mutation tool with a single overloaded union-typed parameter and no output schema, the description covers units, clamping, undo granularity, and target page, which is a reasonable core. It still leaves the create-versus-move semantics and invalid-input behavior unexplained, gaps that matter when calling it on a live document.

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?

Top-level schema coverage is 0%, so the description has to compensate, and it partly does by naming the three item forms and declaring that x/y are picture pixels, which the schema alone does not say. It still leaves 'corner' undefined (which corner index corresponds to which anchor) and says nothing about array ordering or minimum length. The schema's nested items description covers the union shapes, so this is not a total gap.

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 concrete verb and resource: it sets many points/touch areas/corners at exact positions in a single call. The vocabulary maps to the three schema forms (point, zone, corner), so an agent can tell it apart from move_items, copy_points, and distribute_items, which do not take absolute coordinates. The title 'Place many items' and the body's 'points, touch areas or corners' do not use identical wording, which costs a bit of crispness.

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?

Usage is implied rather than stated: bulk placement at exact coordinates in one step, contrasted implicitly with doing it item by item. No sibling is named as an alternative, and there is no explicit when-not guidance (for example, relative moves versus absolute positioning). An agent must infer the boundary against move_items and copy_points from those tools' own definitions.

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