GitHub MCP 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 states the action but doesn't mention authentication requirements, rate limits, whether this is a mutating operation, what happens on success/failure, or how it interacts with GitHub's starring system. This leaves significant gaps for an agent to understand the tool's behavior.

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 maximally concise - a single sentence that states exactly what the tool does with zero wasted words. It's front-loaded and immediately communicates the core function without any 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 the tool's simple function (starring), 100% schema coverage, and the presence of an output schema (which handles return values), the description is minimally complete. However, it lacks important context about authentication, GitHub-specific behavior, and differentiation from sibling tools, which limits its completeness for agent understanding.

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 100% description coverage, clearly documenting both 'owner' and 'repo' parameters. The description adds no additional parameter information beyond what's in the schema, so it meets the baseline of 3 for adequate coverage through structured data alone.

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 ('Star') and resource ('a repository'), making the purpose immediately understandable. However, it doesn't differentiate this tool from its sibling 'unstar_repository' or explain what 'starring' means in this context, which prevents a perfect score.

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 like 'unstar_repository' or 'list_starred_repos', nor does it mention any prerequisites or context for when starring is appropriate. It's a bare statement of function with no usage context.

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