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

With no annotations, the description carries the full behavioral burden and does add valuable details: idempotency semantics that prevent double-posting/double-charging and a price cap that rejects over-cap requests. However, it omits auth/permission requirements, what happens when a channel is invalid or disconnected, and any failure-mode or response behavior.

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 description is three tightly written sentences, with the core purpose front-loaded and the two most consequential behavioral constraints following immediately. Every sentence earns its place, though the parameter notes could be integrated slightly more cleanly.

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?

This is a mutation tool with 7 parameters, 0% schema description coverage, no annotations, and no output schema. The description covers the two most important behavioral constraints but leaves major gaps around channel validity, brand scoping, scheduled_at constraints, return values, and failure behavior.

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%, so the description must compensate and it does explain idempotency_key's required retry semantics and max_price_usd's refusal behavior. But the other five parameters (brand_id, body, scheduled_at, channels, media_urls) receive no semantic elaboration beyond their names and schema types.

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 description states a specific verb and resource ('Schedule a post to one or more channels') and makes the scheduling-to-channels scope clear. It does not explicitly distinguish itself from siblings like cancel_post or list_posts, but the purpose is unambiguous.

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?

There is no guidance on when to use this tool versus alternatives, no prerequisite or authorization context, and no mention of when not to schedule. The reader can infer it is for creating scheduled posts, but nothing routes them between this and sibling tools.

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