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

Annotations only disclose that this is a non-read-only, non-idempotent, non-destructive write; the description goes well beyond that. It explains the 202 response meaning (key not yet checked), that verification and fetching happen on the collector and never at the edge, that nothing is published before the key matches, and the re-send-to-signal-change semantics — all consistent with idempotentHint=false.

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?

The purpose is front-loaded, but the body is padded with repetition: 'No account, no charge' and 'No account, no payment' say the same thing, and the 202 behavior is stated twice. Several sentences do not earn their place.

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, the description carries the return-value burden and does adequately explain the 202 acceptance response and the deferred verification model. It covers limits and required setup, though it does not describe failure responses when the key fails to match.

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 100%, so the baseline is 3. The description's URL-construction notes and the key-file default largely restate what the schema already documents for key, host, urlList, and keyLocation rather than adding new semantics.

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?

The opening sentence names a specific verb and resource ('Submits OKF bundles') and grounds it with an analogy to the IndexNow protocol. This is clear, but it never distinguishes itself from close siblings like feed_post or api_index, so the agent must infer which submission surface to use.

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 lays out concrete prerequisites (a key file on the host you control, or a keyLocation on the same host) and the operational limits (100 URLs/request, 200/host/day), which tells the agent when the tool is usable. It stops short of explicitly naming an alternative tool to prefer under different conditions.

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