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

Annotations already flag destructive=true, idempotent=false and openWorld=true; the description adds the genuinely useful context on top: which actions trigger spending/deletion, that a preview must precede the confirm, that the same requestId must be reused (matching the non-idempotent hint), and that 'live' should only be claimed once status is active. It does not describe what the preview response contains, which matters since there is no output schema.

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?

Front-loaded with the purpose and the safety workflow in short, dense fragments; nothing is padded. The trailing 'Fields: soclo://tools/...' pointer is opaque to an agent that cannot resolve the URI, so it is mildly wasted space rather than helpful structure.

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?

The approval/spend workflow is well covered, which is the hardest part of a destructive tool. However, with no output schema and no statement of what a rendered preview returns (or how 'status is active' is observed), the agent cannot tell what to do with the result before escalating to the owner.

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 60%, with the two safety-critical parameters (confirm, requestId) already documented in the schema itself; the description only echoes the requestId reuse rule. The undocumented remainder — payload (formats, creativeSpec, existingCreativeId), platform, accountId, parameters — gets no meaning added by the description, leaving a real gap for a 10-parameter tool with a nested object.

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+resource ("Render pre-create ad previews") that is clearly distinct from the read-oriented 'get' siblings in the ads family, and 'pre-create' signals it is a preparation step. It stops short of naming the nearest sibling (soclo_ads_get_ad_previews) so the agent must infer the split between rendering a preview and fetching one.

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?

Explicitly lays out the two-step flow: preview first, then a confirm:true call reusing the same requestId only after owner approval. That is actionable when-to-use guidance for the risky path. It does not address when to pick this over sibling preview/read tools, so it stops short of a 5.

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