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

Annotations already declare readOnlyHint=true and destructiveHint=false, so the safety profile is covered. The description adds behavior beyond the schema by stating the return shape ('JSON object mapping file paths to their content'), which is not present in the input schema. It doesn't mention edge cases, but given the read-only nature, this is reasonable.

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 no redundancy. The first sentence states the action and outcome; the second gives usage context and examples. Every word earns its place, and the key behavior is front-loaded.

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 simple two-parameter tool with no output schema, the description is sufficient. It specifies the return type, the sequencing relative to the manifest, and gives representative file paths. An agent has everything needed to call it correctly without further clarification.

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% for both params, so the baseline is 3. The description adds a small amount beyond the schema by listing example file paths and clarifying the mapping in the return, but it does not deeply enrich parameter meaning. It provides a practical orientation but no new semantic constraints.

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 ('Fetch') and a clear resource ('multiple documentation files by their paths'), and specifies the return format ('JSON object mapping file paths to their content'). It also distinguishes this from the sibling design_system-get_manifest by implying the manifest is for listing while this is for retrieving specific files.

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 gives explicit usage timing: 'Use this after getting the manifest', and provides concrete examples (README.md, COMPONENTS.md, TROUBLESHOOTING.md). This clearly instructs when to use this tool relative to its sibling and what it is for.

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