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

Annotations already declare readOnlyHint, idempotentHint, and destructiveHint, and the description adds concrete transformation behavior. However, it states 'convert tabs to spaces' as a flat fact while the schema shows tab_to_spaces is optional and defaults to keeping tabs. This could mislead an agent about the default behavior, creating a transparency gap.

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 two sentences with dense, front-loaded information. The first sentence enumerates all operations in a compact list; the second gives a practical use case. There is no filler, restating of the tool name, or redundant content.

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 rich annotations, 100% parameter schema coverage, and presence of an output schema, the description covers the tool's main behaviors and usage contexts sufficiently. The only gap is the tab conversion default ambiguity, which prevents a perfect completeness score.

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's transformation list paraphrases parameters (trim_lines, collapse_blanks, line_ending, tab_to_spaces) but provides no additional default, format, or range details beyond what the schema already documents. It adds marginal semantic value.

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 opens with a clear verb and resource, 'Normalize whitespace,' followed by a precise enumeration of transformations ('trim trailing spaces, collapse blank lines, normalize line endings (LF/CRLF), convert tabs to spaces'). This distinguishes it from sibling tools like sort_lines or format_json by specifying exactly what whitespace normalization does.

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 second sentence offers clear usage context: 'Useful for cleaning code, configs, and text before processing.' It tells the agent when to use it, but does not explicitly name alternatives or exclusion cases, so it falls short of the 5-level despite being a clear and practical guideline.

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