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. It mentions 'upload or replace,' implying a write/mutation operation, but doesn't disclose critical behavioral traits: whether this requires admin permissions, if it's idempotent, what happens on failure (e.g., validation errors), or if it affects existing SAML logins. For a mutation tool with zero annotation coverage, this is a significant gap in transparency.

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 concise and front-loaded: the first sentence states the endpoint's purpose, and the second reinforces usage. Both sentences earn their place by clarifying the action and context. However, it could be slightly more structured (e.g., bullet points for key points) but remains efficient with zero waste.

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 the complexity (a mutation tool for SAML configuration), lack of annotations, and no output schema, the description is incomplete. It doesn't explain what the tool returns (e.g., success confirmation, error details), prerequisites, or side effects. For a security-sensitive operation like SAML setup, more context is needed to guide an agent effectively.

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 input schema has 0 parameters with 100% description coverage, meaning no parameters are documented in the schema. The description doesn't mention any parameters, which is appropriate here since none exist. However, it doesn't clarify if metadata is provided via request body, headers, or other means, leaving a minor gap. Baseline for 0 parameters is 4, as the description doesn't need to compensate for missing param info.

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 tool's purpose: 'upload or replace IdP metadata for SAML login configuration.' It specifies the verb ('upload or replace'), resource ('IdP metadata'), and context ('SAML setup'). However, it doesn't distinguish this tool from potential siblings like 'update_saml_configurations' or similar, which might exist in other contexts but aren't listed in the provided sibling tools.

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 minimal usage guidance, stating only 'Use this endpoint to upload or replace IdP metadata for SAML login configuration.' It lacks explicit when-to-use vs. when-not-to-use criteria, prerequisites (e.g., existing SAML configuration), or alternatives (e.g., other SAML setup tools). No sibling tools in the list appear directly related, but the guidance is insufficient for an agent to make informed decisions.

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