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

Annotations already declare readOnly, idempotent, non-destructive and closed-world, so the safety profile is covered. The description adds real behavioral context beyond that: the result set includes published, cancelled and failed posts (not just pending), and each item carries the next publish time and the last error — details an agent could not infer from the annotations.

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 short sentences with the result content first and the filter hint second; nothing is padded. The opening is a noun fragment rather than a verb-led statement, which is a minor structural weakness but costs no comprehension.

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 simple read-only list tool with one optional parameter and no output schema, the description covers scope, item statuses and the returned fields an agent would care about. It omits ordering, pagination or result-size behavior, which is the one remaining gap for a list operation.

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 carry the meaning, and it does: account_id narrows the listing to a single account, with the unset case implicitly meaning the whole workspace. It doesn't state what an unknown or invalid account_id does, but the core semantics are supplied.

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 resource (scheduled posts) and scope ('in this workspace'), and explicitly notes it includes published, cancelled and failed entries — a non-obvious scope detail. It implies differentiation from siblings like list_own_posts or list_user_posts via the workspace scope, but never names them.

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?

Usage is only implied: you call it to see scheduled posts, and 'Pass account_id for one account' hints at a filtering mode. There is no explicit when-to-use vs. when-not guidance and no named alternative for the user-scoped listings that appear in the sibling set.

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