MCP Email Service

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

With no annotations provided, the description carries full burden for behavioral disclosure. It mentions the tool operates on 'local sync service and databases' which hints at system-level operations, but doesn't describe critical behaviors like whether actions are destructive (e.g., 'force' sync might overwrite data), authentication requirements, rate limits, or error handling. The description lacks details on what 'manage config' entails beyond the schema.

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 appropriately concise with two sentences: the first front-loads the tool's purpose and actions, and the second adds operational context. There's no wasted text, though it could be slightly more structured by separating action groups (e.g., control vs. query actions).

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?

Given the tool's complexity (6 parameters, nested objects, multiple actions) and no annotations or output schema, the description is moderately complete. It covers the scope and action types but lacks details on behavioral traits, error cases, and output formats. For a multi-action tool with system-level operations, more context would be beneficial.

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%, so the schema already documents all 6 parameters thoroughly. The description adds minimal value beyond the schema by listing action types in parentheses, but doesn't provide additional context like parameter interdependencies or semantic nuances (e.g., how 'full_sync' interacts with 'force' action). Baseline 3 is appropriate given 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 clearly states this is a 'Unified email synchronization tool' that performs multiple actions (start/stop scheduler, force sync, get status, search cache, manage config). It specifies the verb ('synchronization') and resource ('emails'), though it doesn't explicitly differentiate from sibling tools like 'get_sync_health' or 'get_sync_history' which might overlap in purpose.

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 implies usage context by mentioning 'Operates on the local sync service and databases,' but doesn't provide explicit guidance on when to use this tool versus alternatives like 'get_sync_health' or 'search_emails.' It lists action types but doesn't specify prerequisites or exclusions for different actions.

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