Inbox Dashboard

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

With no annotations, the description carries the full disclosure burden and does meaningful work: it states the return is a UIResource, that it renders only in compatible MCP clients, and that mcp-ui-server is a dependency. That environmental constraint is exactly the kind of non-obvious behavior an agent needs. It does not explicitly confirm the operation is read-only, so not a 5.

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?

Front-loaded with the core purpose, then a scannable bullet list of dashboard contents, then the client-requirement note. Slightly redundant in restating 'interactive dashboard' twice ('interactive dashboard view' / 'interactive UI dashboard'), but otherwise every line earns its place.

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?

There is no output schema, so the description correctly compensates by describing what the returned UIResource contains. Combined with zero params and explicit client prerequisites, an agent has what it needs to call it. The minor gap is no guidance on failure behavior when the client lacks MCP Apps support.

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 per the rubric the baseline is 4. There is nothing for the description to clarify beyond that, and it correctly avoids inventing parameter semantics.

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 and resource: 'Get an interactive dashboard view of your email inbox.' The enumeration of contents (unread counts, recent emails, quick actions, search) makes the scope concrete and distinguishes it from data-returning siblings like list_inbox_emails or get_mailbox_unread_counts. It stops short of naming an alternative sibling explicitly, so it lands at 4 rather than 5.

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 context is implied rather than stated: the note that it needs mcp-ui-server and a compatible MCP client signals this is only useful in UI-capable clients, which is a real gating condition. However, there is no explicit 'use this when you want X, use get_inbox_overview instead when Y' routing against the many overlapping inbox/stats siblings.

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