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

Annotations already establish the safe-read profile (readOnlyHint, idempotentHint, destructiveHint=false, openWorldHint=false). The description adds genuinely new context beyond them: this returns guidance rather than event data, the guidance is runtime-specific, and it is meant to run before webhook creation. It omits any note on return shape or rate limits, so not a 5.

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: the first establishes what is returned and for whom, the second establishes when to call it. Front-loaded purpose before the usage constraint.

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 output schema, the description carries the burden of explaining the return and does so at a high level ('runtime-specific instructions for receiving realtime events'). It is adequate for a one-enum-parameter, read-only guide tool, though it never sketches what the instructions actually contain (steps, code snippets, URLs).

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%, but the single parameter is an enum whose five values are self-describing, and the description restates them in prose ('n8n, OpenClaw, Hermes, Make or a generic agent'), confirming the agent must pick its runtime. It does not explain what 'generic' yields or how the instructions differ per runtime, so it adds only marginal meaning beyond the enum.

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 (get) and resource (setup guide) and enumerates the exact runtimes covered: n8n, OpenClaw, Hermes, Make, generic agent. This clearly distinguishes it from sibling write/read tools like webhook_create_destination and webhook_get_destination, which operate on destinations rather than returning instructions.

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?

Gives an explicit sequencing rule: 'Use BEFORE creating the webhook when the user has not yet produced a public receiver URL.' That is a clear precondition and implies the when-not case. It does not name an alternative tool for the case where a receiver URL already exists, so it falls short of a full 5.

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