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

Annotations already declare destructiveHint=true and readOnlyHint=false, so the bar is lower. The description adds valuable context beyond annotations: the atomicity of the batch ('atomic batch update'), the risk of index calculation errors, and the recommended phased workflow to avoid them. It doesn't contradict any annotations, and the added atomicity and workflow notes improve transparency without being fully exhaustive.

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 long but well-structured and front-loaded. It opens with a clear purpose sentence, then gives usage alternatives, followed by a detailed workflow with a code example. While verbose, every section serves a purpose for a complex tool with many operation types. It could be slightly trimmed, but the structure (headings, phases) aids scannability.

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?

Given the tool's high complexity (numerous operation variants), the rich schema, and the presence of an output schema, the description is complete. It covers purpose, alternatives, workflow, parameter nuances, and example usage. It does not need to explain return values because an output schema exists, and it provides enough context for an agent to invoke the tool correctly, especially with the phased approach to avoid common errors.

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 100%, so the baseline is 3. The description adds meaningful parameter guidance: it explains when to use end_of_segment=true vs index, warns that segment_id must be a real ID from inspect_doc_structure (not 'kix.header'), and provides a concrete example batch. This goes beyond the schema's basic field descriptions.

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 verb ('Executes') and resource ('multiple low-level document operations in a single atomic batch update'), clearly distinguishing it from sibling tools. It further differentiates by explicitly naming when to use update_doc_headers_footers instead, reinforcing the tool's unique role.

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 explicit when-to-use and when-not-to-use guidance: 'For normal header/footer text, prefer update_doc_headers_footers' and 'Only use create_header_footer here for advanced section-break layouts.' It also includes a detailed recommended workflow with phases, explaining when to use end_of_segment=true versus index, which is actionable usage guidance.

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