get_messages

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

The description adds significant behavioral detail beyond the annotations: it states tapbacks are excluded, limit is capped at 200, and includes a security note about treating message text as untrusted data. These are not implied by readOnlyHint or destructiveHint, so the description fully carries the burden of behavioral disclosure.

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 structured in three tight paragraphs: purpose, parameter details, and a security reminder. Every sentence earns its place—no fluff, no repetition, and the most important info (purpose) is front-loaded.

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 simplicity (2 params, output schema present), the description is remarkably complete. It covers parameter formats, ordering, exclusions, limits, and even a security consideration. Nothing critical is missing for an agent to use it correctly.

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?

With 0% schema description coverage, the description fully compensates by explaining the exact accepted formats for 'chat' (phone/email or guid) and the pragmatic limit of 'limit' (capped at 200). It clarifies both parameters in a way the schema alone does not, adding real semantic value.

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 'Get recent messages from a conversation'—a specific verb+resource. It further specifies the chat parameter types (chat_identifier or chat guid), ordering (newest first), and exclusions (tapbacks), which fully conveys the tool's scope and differentiates it from siblings like list_chats and search_messages.

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 gives a clear usage context—how to specify the chat (phone/email for 1:1, chat guid for groups) and notes that guid comes from list_chats. However, it does not explicitly state when to choose this tool over get_recent_messages or search_messages, missing the 'when not to use' guidance present in higher-scoring examples.

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