create_milestone

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

With no annotations, the description carries full burden. It discloses that new milestones start in state 'open' and returns the milestone with its id. However, it omits details about error handling, idempotency, or required permissions, which are important for a mutation tool.

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 two sentences, front-loading the purpose and then providing key details. Every sentence adds value without redundancy or fluff.

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 no output schema, the description specifies the return value (milestone with id). It covers initial state and parameter requirements. Minor gaps: no mention of error conditions or default behavior for owner/repo, but overall sufficient for a simple create operation.

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 coverage is 100%, but the description adds value by noting that `title` is required, `due_on` has an ISO 8601 example, and providing the initial state 'open' which is not in the schema. This helps the agent understand parameter usage 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 clearly states the action 'Create a milestone', identifies the resource, and specifies required vs optional parameters. It distinguishes itself from sibling tools like list_milestones, update_milestone, and delete_milestone by focusing on creation.

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 implies usage when a milestone needs to be created but does not explicitly state when to use or avoid this tool. There is no mention of alternatives or prerequisites, though the defaulting of repo and owner provides some context.

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