MCP Datadog Server

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

With no annotations provided, the description carries full burden for behavioral disclosure. It mentions sending emails (implying a notification action) but doesn't describe what happens after invitation - whether users are provisioned immediately, what permissions they get, whether invitations expire, or what the response format looks like. For a tool that likely involves external communication and user management, this is insufficient behavioral context.

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 that states exactly what the tool does without unnecessary words. It's front-loaded with the core action ('Sends emails') and includes all essential information about the tool's purpose. Every word earns its place in this concise formulation.

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 (sending emails, creating invitations) with no annotations and no output schema, the description should provide more context about behavioral aspects. While it clearly states the purpose, it lacks information about what the tool returns, error conditions, or side effects. The completeness is adequate for basic understanding but insufficient for confident agent usage without additional trial or documentation.

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, so there are no parameters to document. The description appropriately doesn't attempt to describe nonexistent parameters. A baseline of 4 is appropriate since the schema fully covers the parameter situation (which is that there are none).

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 clearly states the action ('Sends emails') and target ('to one or more users inviting them to join the organization'), providing a specific verb+resource combination. It distinguishes itself from sibling tools like 'create_users' which likely creates user records rather than sending invitations. However, it doesn't explicitly differentiate from other invitation-related tools that might exist in the broader 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. It doesn't mention prerequisites (like needing user emails or permissions), doesn't specify when invitations are appropriate versus direct user creation, and doesn't reference any sibling tools for comparison. The agent must infer usage from the name alone.

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