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

The annotations already declare readOnlyHint, idempotentHint, non-destructive behavior, and a closed-world scope. The description adds useful context about the UI placement and panel contents, but it does not add behavioral details beyond what the annotations and output schema already cover.

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 well-formed sentence with the action front-loaded and no unnecessary wording. Every phrase contributes to explaining what the panel does and why the user would open it.

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?

This is a simple UI-opening tool with complete annotations, full parameter schema coverage, and an output schema. The description covers the essential purpose and contents, though it could be more complete by clarifying how it relates to the sibling list-and-open tools.

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 optional parameters are fully documented in the schema. The description does not explain the view or agentId parameters, so it adds no meaning beyond the structured input schema; this matches the baseline for high schema coverage.

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 uses a specific verb and resource: 'Open the Agent Inbox panel beside the chat.' It also states what the panel lists and the user's goal, but it does not explicitly distinguish this action from sibling tools such as list_conversations or list_leads.

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 phrase 'so the user can pick one to discuss' implies the intended use case, but there is no explicit guidance on when to use this panel versus the sibling list tools or when not to use it. Usage is therefore only implied rather than clearly routed.

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