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

Annotations already declare readOnlyHint=true, so the safety profile is covered. The description adds meaningful context beyond that by disclosing what the call returns (the ingress URL and its transform), which matters because no output schema exists. It stops short of noting failure behavior for a missing or invalid id.

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 short sentences, zero waste. The core action leads and the API mapping trails, so nothing important is buried.

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?

For a one-parameter read with no output schema, the description covers purpose and return shape, which is what an agent needs to invoke it correctly. Only error/not-found semantics are left implicit, a minor gap at this complexity level.

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 webhook_id parameter is fully documented in the schema (100% coverage), so the schema carries the burden. The description only echoes that a webhook id is required implicitly via the path, adding no format or constraint detail 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?

States a specific verb ("Fetch") and resource ("a single webhook ingress"), and the qualifier "single" cleanly differentiates it from the sibling inngest_list_webhooks and inngest_delete_webhook. It even adds the underlying API route, so an agent knows exactly what operation this maps to.

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?

Usage is only implied: fetch one webhook when you have its id. There is no explicit statement of when to prefer this over inngest_list_webhooks or what happens if the id is unknown. Adequate but no exclusions or alternatives named.

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