subscribe

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

No annotations are provided, so the description carries the full behavioral burden and largely drops it. It does not say whether subscribing is idempotent, whether it requires GitHub auth or specific scopes, whether events accumulate into 'pending_events', how long the watch persists, or what the response contains.

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?

One short, front-loaded sentence with zero wasted words. It is arguably too terse given how much behavioral information is missing, but there is no padding or burying of the key point.

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?

With no annotations, no output schema, and sibling tools that clearly interact with this one ('unsubscribe', 'subscriptions', 'pending_events'), an agent needs to know how subscription state and events flow. None of that lifecycle context is present, leaving the definition under-specified for its role.

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 single parameter 'pr' is fully documented in the schema (URL or OWNER/REPO#NUMBER), so the high coverage baseline of 3 applies. The description adds no format examples, validation notes, or edge-case guidance beyond what the schema already states.

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?

States a specific verb ('watch') and resource ('GitHub pull request') and adds the purpose ('for new activity'), so the intent is unambiguous. It does not explicitly differentiate itself from the sibling 'unsubscribe' or explain the relationship to 'pending_events', so it falls short of a 5.

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 phrase 'for new activity' implies the use case of monitoring a PR, but there is no explicit when-to-use, no prerequisites (auth scope, whether a subscription must be unsubscribed first), and no mention of the alternatives that the siblings 'unsubscribe' and 'subscriptions' provide.

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