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

Annotations already declare destructiveHint=true and readOnlyHint=false, but the description adds real behavioral context beyond them: it does not regenerate source, and it distinguishes acknowledgment behavior for active (rendering) vs inactive (saved data only) components. It does not discuss permissions, revision conflicts, or reversibility, keeping it below 5.

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 tight sentences with the core action front-loaded and the active/inactive distinction compactly stated. No filler, though the second sentence is dense and would benefit from slight unpacking.

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 destructive mutation with no output schema, the description covers behavior reasonably but omits critical operational details an agent needs: what expectedRevision does on mismatch, what controlToken authorizes, and how this differs from update_component. Adequate but with clear gaps.

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 5 required parameters, including a nested 'data' object and a controlToken. The description references 'component data' only and says nothing about operationID, expectedRevision (optimistic concurrency), or controlToken, so it fails to compensate for the coverage 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 specific verb and resource ('Replaces supplied component data') and adds a scope qualifier ('without regenerating source'). It is reasonably distinguishable from write siblings, though it never explicitly contrasts with update_component, so it stops short of a 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?

No when-to-use guidance and no named alternative. With siblings like update_component and update_draft, an agent has to guess whether set_component_data is the right mutation tool; the description provides no routing context.

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