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

Annotations already indicate readOnlyHint=false and destructiveHint=false, and the description adds meaningful merge semantics with 'merges ... without duplicates.' Still, it does not disclose side effects on an existing table of contents, the role of expected_revision, or what happens with dry_run.

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 a single sentence with no filler, and 'without duplicates' adds useful behavioral detail. It is appropriately concise, though it could have used its brevity to cover more of the parameter semantics.

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?

With no output schema and sparse annotations, the description carries a heavy burden, but it omits prerequisites, the effect on existing TOC entries, and the meaning of expected_revision and dry_run. This is insufficient for a mutating import tool.

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% and the description mentions none of the three parameters. It does not clarify catalogue_id, expected_revision, or dry_run behavior, leaving the agent to rely solely on parameter names and patterns.

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 uses a specific verb ('Merges') and names the resource ('PDF bookmarks' into 'table of contents'), adding the useful 'without duplicates' guarantee. It is clearly not a generic operation, though it does not explicitly differentiate itself from the sibling foliade_set_chapters.

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 implies a use case: when PDF bookmarks should be merged into the table of contents. However, it provides no explicit when-to-use or when-not-to-use guidance, and it does not mention any alternative tools.

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