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

Annotations already declare readOnlyHint=true and destructiveHint=false, so no contradiction exists. The description reinforces read-only status and adds routing context about signed-in state, but it does not disclose additional behavioral traits such as return format or whether authentication is required.

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 compact and front-loaded with the core purpose. The routing guidance and official site link are relevant and concise; no sentence is wasted.

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 parameters and an output schema present, the tool is simple to invoke. The description covers the most important routing decisions, though it could have added a brief positive use case to fully ground when to select ucode_instructions over siblings.

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 input schema has zero parameters and schema description coverage is 100%, so there are no parameter semantics to explain. Per the zero-parameter baseline, this is adequate.

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 states the tool is a 'Full product guide (read-only)', clearly identifying the resource and verb. It does not differentiate from ucode_help or other guide-like siblings, but the read-only guide framing is specific enough to be usable.

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 description explicitly says not to use it as the first message and names ucode_welcome as the alternative to call first. It also gives a clear condition for routing unsigned users to ucode_welcome/ucode_login_start, though it does not state a positive 'use this when...' case.

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