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

Annotations cover the safety profile (readOnlyHint=false, destructiveHint=false, openWorldHint=true), so the description only needs to add operational context. It does: undated items are 'spread across the free slots of the posting queue,' a non-obvious scheduling side effect that governs how the tool actually behaves.

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?

Three sentences, front-loaded with the core action and followed by the scheduling rule. The closing 'content plan for the month' sentence is softer framing than specification, but it is short and does carry batch-intent signal.

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 5-parameter batch-write tool with no output schema, the description covers batch semantics, account targeting, and queue filling. Idempotency and workspace resolution are delegated to the schema, which documents them fully, so only return/error expectations are left implicit.

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 earns above that by clarifying cross-parameter semantics — undated items flow into free queue slots, and each item fans out to all accountIds. That is meaningfully more than the per-field text repeats.

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 ('Create many posts') plus a scope qualifier ('for the same accounts in one call'), which cleanly separates it from the singular create_post and from schedule_post. An agent can identify the batch path without opening the schema.

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?

'Ideal for loading a content plan for the month' gives one implied use case, so the tool's niche is inferable. However, it never names create_post or schedule_post as the alternatives, nor does it say when a single call is preferable — the when-not side is entirely absent.

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