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

Annotations already declare readOnly=false, openWorld=true, and destructive=true, so the safety profile is covered. The description adds genuinely non-obvious behavior: events are signed and the signing secret is returned only once, which the agent must surface to the caller. It does not mention rate limits or what happens when a duplicate URL is registered.

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, zero waste, with the core action and triggers front-loaded and the one-time secret disclosure placed last as the critical operational note.

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?

No output schema exists, and the description compensates by describing the response (signing secret shown once). Combined with full trigger coverage, this is sufficient for a 3-parameter creation tool, though it leaves gaps on auth requirements and duplicate-webhook behavior.

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 0%, so the description has to carry meaning: it translates the three enum events into plain-language triggers ('run finishes', 'monitor finds something new', 'records are added') and mentions the URL. It does not clarify why both 'events' and 'event_name' exist or which one wins, nor does it state the default of event_name.

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 and resource ('Adds a webhook') and immediately enumerates the three trigger conditions, which map onto the event enum. An agent can tell this creates a webhook subscription rather than a sync, connection, or note without opening the schema.

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 trigger list implies when a webhook is relevant (run completion, monitor hits, record additions), but there is no explicit when-to-use versus alternatives guidance, no prerequisites or permission notes, and no mention of how this differs from neighboring subscription tools like create_destination_sync.

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