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

With no annotations, the description carries the full burden; it does disclose the key state transition (scheduled -> draft) and clarifies the operation is non-destructive ('Does not delete anything'), which is valuable. It omits permission/workspace-scope requirements, idempotency, and what happens if the post is not currently scheduled or is already published.

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 tight clauses, effect front-loaded and the clarifying non-effect second. Nothing wasted and nothing buried.

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 2-param mutation with no annotations and no output schema, the description covers the core semantics but leaves gaps an agent would want: what 'id' refers to, workspace scoping behavior on cancel, and failure modes for posts that aren't scheduled. It is adequate but not fully self-sufficient.

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 only 50%: 'workspace' is documented in the schema, but 'id' has no description anywhere, and the description does not compensate by stating that id is the post identifier. The description adds no parameter meaning at all.

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?

Specific verb+resource ('Cancel a scheduled post') plus the resulting state ('reverts it to draft'), which separates it from update_post and from any delete tool. It does not name a sibling explicitly, so it stops short of a 5.

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?

The phrase 'so it will not fire' implies the use case (unscheduling upcoming content), but there is no explicit when-to-use rule, no exclusion (e.g., published or already-draft posts), and no named alternative such as update_post or delete.

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