create_subscription

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

With no annotations, the description carries the burden of disclosing side effects. It only states creation and defaults; it does not mention what happens after creation, whether it overwrites, any prerequisites, or response type. The defaults add minor behavioral context but the mutation is largely opaque.

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?

Two sentences, front-loaded with the purpose. The required parameter and defaults are stated concisely with no irrelevant content.

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?

The schema already documents all 11 parameters, so the description does not need to repeat them. However, there is no output schema and no annotations, so the description should explain the behavior of subscription creation, which it does not. The high-level context is thin.

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%, so the baseline is 3. The description adds a default for 'type' (public-repo) and clarifies the URL format, but the required flag and schedule_type default are already in the schema. The added value is incremental.

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 'Create a repository subscription' with a specific verb and resource. It adds useful defaults and highlights the required parameter, distinguishing it from other create_* tools in the sibling list.

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 gives a required parameter and defaults, implying when to use the tool, but does not explicitly compare to alternatives or state exclusions. No guidance on when to select this versus run_subscriptions, enable_subscriptions, or when to use interval vs cron.

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