configure_api_key

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

Discloses that the key will be saved to .env file, tested for validity before saving, and includes a security note to keep it secret. This goes well beyond the lack of 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?

Three concise sentences, no wasted words, and the main purpose is front-loaded. Each sentence adds meaningful information.

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 single-parameter tool with no output schema and no annotations, the description covers purpose, usage scenario, behavior (saving to .env and validation), and security, making it fully self-contained.

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?

The schema already describes the parameter well (100% coverage), but the description adds context about the target audience and the persistence behavior, providing extra value beyond the schema.

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?

Clearly states the verb 'configure' and resource 'existing API key for MCP access', and distinguishes from numerous sibling tools that deal with papers, reviews, etc. by specifying the context of OAuth registration and web portal key.

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?

Provides clear context for when to use ('if you already have an API key from web portal' and 'if you registered via OAuth'), but does not explicitly state when not to use or list alternatives. However, the sibling tools are unrelated, so it's clear enough.

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