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

Annotations already declare readOnly, idempotent, non-destructive, and non-open-world behavior. The description adds useful context about the live endpoint path, function status values, env var NAMES rather than values, run frequency, and live address, though it does not discuss pagination or permissions.

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?

The description is a single dense sentence with no filler and front-loads the resource before listing returned fields. The parenthetical examples and field list are relevant, though the density makes it somewhat less scannable.

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 return-value burden and does a good job listing the fields an agent will see. It omits pagination, ordering, and empty/error-state behavior, but those are minor for a simple read-only list tool.

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 100%, and both site_id and user_goal are already documented in the input schema. The description only restates site context via the endpoint placeholder and adds no syntax or format meaning beyond what the schema provides, so the baseline 3 applies.

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 precisely identifies the resource ('The site's functions'), explains what these functions are, and enumerates the summary fields returned. It clearly implies a list/summary view rather than detailed retrieval, though it does not explicitly name sibling tools such as get_function_details.

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?

There is no explicit guidance on when to use this tool, when not to use it, or which sibling tool to choose instead. Usage is only implied by the resource being listed, with no routing to alternatives like get_function_details or create_function_draft.

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