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

Annotations already declare readOnlyHint=false and destructiveHint=true, so the description does not need to repeat that. It adds some behavioral context by explaining that make_default changes the starting point of new catalogues. However, it does not mention the optimistic concurrency mechanism (expected_revision) or any side effects beyond persistence, leaving gaps.

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 very short (two sentences) and front-loads the main action, which is good for conciseness. However, it is under-specified for a tool with six parameters and a nested patch object, so the brevity works against completeness. It is not overly verbose but also not sufficiently informative.

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 mutating tool with three required parameters, no output schema, and no parameter documentation, the description is far from complete. It does not explain how patch interacts with the theme, what expected_revision is for, or when dry_run should be used. An agent cannot confidently call this tool based on the description alone.

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 explain parameters. It only explains make_default, while theme_id, patch, dry_run, and expected_revision are left unexplained. The patch object's many fields are undocumented in the description, making it hard for an agent to know what to pass.

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 it changes a theme, which identifies a specific resource and verb, but it is vague about what exactly changes and does not distinguish it from sibling tools like apply_theme. It mentions make_default explicitly, but the main purpose is under-specified.

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 description provides no guidance on when to use this tool versus alternatives. It does not mention apply_theme for applying themes to catalogues or create_theme for creating new themes, nor does it describe the role of expected_revision or dry_run. The only usage hint is about make_default, which is a parameter, not a usage condition.

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