MCP Datadog Server

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

No annotations are provided, so the description carries the full burden. 'Register' implies a write operation, but it doesn't disclose any behavioral traits: no information about permissions required, whether this is idempotent, what happens on conflict, rate limits, or what the response contains. The description is minimal and leaves critical behavioral aspects unspecified.

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 a single, efficient sentence with no wasted words. It's appropriately sized for a tool with no parameters and gets straight to the point without unnecessary elaboration.

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 that this is a mutation tool (register implies creation) with no annotations, no output schema, and no parameters, the description is incomplete. It doesn't explain what an 'App Key' is, what registration entails, or what the tool returns. For a write operation, more context about behavior and outcomes is needed.

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 tool has 0 parameters with 100% schema description coverage (empty schema). The description doesn't need to explain parameters, and it correctly doesn't mention any. Since there are no parameters to document, this meets expectations, though it doesn't add 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?

The description 'Register a new App Key' clearly states the action (register) and resource (App Key), but it's vague about what 'App Key' refers to and doesn't differentiate from sibling tools like 'create_api_keys' or 'create_application_keys'. It provides a basic purpose but lacks specificity about the domain or context.

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 no guidance on when to use this tool versus alternatives. With many sibling tools like 'create_api_keys' and 'create_application_keys' that might serve similar purposes, there's no indication of when this specific registration is appropriate or what distinguishes it from other key creation tools.

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