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

Annotations already declare readOnlyHint=true, so the agent knows this is a safe, non-mutating call. The description adds that the tool returns explanatory content (device flow, scopes, approvals) rather than performing a connection, which is useful context, but it says nothing about output format or whether calling it has any side effect on the auth state.

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 with zero filler: the first states what the tool explains, the second states the call condition. The relevant trigger is front-loaded at the end of a tight, well-ordered statement.

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 zero-parameter, read-only informational tool with no output schema, the description covers enough for correct invocation: what it explains and when to call it. It stops short of noting that calling it does not itself grant a token, which would fully close the loop.

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 tool takes zero parameters, so there is nothing for the description to disambiguate; the baseline of 4 applies. No parameter-level detail is needed or missing.

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?

Names a specific verb (Explain) and resource (how to connect an agent to a human on Day1Work), then enumerates the covered topics: device flow, scopes, and human approval. That makes it clearly distinguishable from the action-oriented siblings like check_approvals or whoami.

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 trigger condition: 'Call this when you need to act for someone but have no token yet.' That tells the agent precisely when the tool applies, though it names no alternative tools or exclusions for adjacent cases such as already holding a token.

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