GitHub MCP Server

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

No annotations are provided, so the description carries full burden. It states the action ('Fork') but doesn't disclose behavioral traits such as whether this requires write permissions, if it's idempotent, what happens on success/failure, rate limits, or the effect on the original repository. The description is too sparse for a mutation tool with no annotation coverage.

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 extremely concise with just two words, front-loading the key action. There is no wasted language, making it efficient, though this brevity contributes to gaps in other dimensions.

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 there's an output schema (which handles return values) and full schema coverage for parameters, the description doesn't need to explain those. However, for a mutation tool with no annotations, it should provide more behavioral context (e.g., permissions, side effects). The description is minimally complete but lacks depth for safe and effective use.

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?

Schema description coverage is 100%, so the schema already documents all parameters (owner, repo, organization) with descriptions. The description adds no additional meaning beyond the schema, such as explaining the relationship between parameters or usage examples. Baseline 3 is appropriate when schema does the heavy lifting.

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 states the action ('Fork') and resource ('a repository'), which is clear but minimal. It doesn't differentiate from sibling tools like 'create_repository' or explain what forking entails (e.g., creating a copy under user's account vs. organization). The description is adequate but lacks specificity about scope or outcome.

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?

No guidance is provided on when to use this tool versus alternatives. It doesn't mention prerequisites (e.g., authentication, permissions), when forking is appropriate compared to cloning or creating a new repository, or how it relates to sibling tools like 'create_repository'. The description offers no usage context.

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