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

Goes well beyond the annotations: it names exactly what is destroyed (every older checkpoint), states that the change is publicly visible immediately when the design is live (reinforcing openWorldHint with a concrete consequence), constrains input to the newest checkpoint, and clarifies that template notices in the result are inherited from checkpoint creation rather than generated now.

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 critical effect (keep one, delete the rest) is front-loaded, which is good. But 'Specified checkpoint becomes the only version of the design after saving' duplicates the opening sentence, and 'The design id stays the same' is a fragment whose relevance is unclear, so the piece is longer than it needs to be.

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 destructive, open-world, idempotent mutation it covers what is destroyed, what goes public, and the ordering precondition. The output schema removes the need to explain return values, though error behavior when the checkpoint is not the newest, and any permission requirements, are left unstated.

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 100% and the single CheckpointID property already documents 'newest checkpoint to keep; older checkpoints removed.' The description restates that constraint and adds only that the design id is unchanged, which is not a parameter behavior. Baseline 3 applies when the schema carries the 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?

States a specific verb+resource with a precise effect: keeps the named checkpoint, deletes older ones, and promotes it live if the design is active. That is far more than the title's 'Save a blog design'. It doesn't name blog_design_checkpoint_restore or blog_design_activate explicitly, so the sibling distinction is inferred rather than declared.

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?

One real precondition is given ('The checkpoint must be the newest one'), and the live-blog clause hints at the relationship with blog_design_activate. But there is no explicit when-to-use-this-instead-of guidance versus checkpoint_restore, activate, or edit.

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