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

Annotations already declare readOnlyHint, openWorldHint, and idempotentHint. The description adds context that the source comes from open-source repositories, implying public access and no authentication. It also lists example content facets (types, interfaces, hooks). No contradiction with annotations.

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?

A single concise sentence that front-loads the action ('Fetch SDK source code') and specifies the resource and domain. No filler or redundancy.

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 read-only retrieval tool with a detailed schema and three safety hints, the description adequately captures the tool's purpose. No output schema exists, so return format is not required. The description is complete for an agent to decide when to use it.

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%: all three parameters (platform, focus, module) have descriptions with enums and a default. The tool description itself does not add parameter-specific information, so it relies on the schema. With high schema coverage, a baseline score of 3 is appropriate.

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 'Fetch SDK source code' with a specific resource and domain ('open-source Web3Auth repos'). It clearly distinguishes from sibling tools like get_doc and get_example by focusing on source code rather than documentation or examples.

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 use for retrieving SDK source code, contrasting with siblings for docs/examples. However, it does not explicitly name alternatives or provide exclusion criteria. The module parameter guidance ('Call without module first') offers internal usage help but not inter-tool guidance.

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