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

Annotations already declare destructive=true, readOnly=false, openWorld=true, so the safety profile is covered. The description adds genuinely non-structured behavior: the 32KB merge bound, module reuse for same-source React, and the split acknowledgement semantics (active components ack rendering, inactive ack saved data only).

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?

Five tight sentences, front-loaded with the core action before parameter details. Dense but no filler; the React module-reuse sentence is niche but arguably informative.

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 7-param mutation with no output schema and no param descriptions, the description covers the acknowledgment behavior and merge bound well, but omits revision-conflict handling and controlToken requirements. An agent can call it, but not fully anticipate conflict/authorization failures.

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?

With 0% schema description coverage the description must carry the load, and it does explain merge, slot (nested sub-component on a fullscreen board), and the data replace/merge behavior. However expectedRevision, controlToken, operationID, and componentID are left undecoded, and expectedRevision in particular implies optimistic-concurrency semantics the agent cannot infer.

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 and resource ('Pushes live observations', 'set component data') and clarifies it works 'without regenerating source'. It is clearly distinct from read_component/update_component by nature of pushing live data, though it never names a sibling explicitly.

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?

It explains the two data modes (default replace vs merge:true), which guides parameter choice, but never says when to prefer this tool over update_component, create_component, or render, nor any exclusions. No tool-selection guidance is present.

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