get_encrypted_messages

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

No annotations are provided, so the description carries full burden. It states 'optional decryption' but does not explain what decryption entails (e.g., requires keys, may fail) or whether the operation is read-only. The retrieval aspect is clear, but the decryption behavior is underspecified.

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?

Description is extremely concise at 8 words. It wastes no words, but could benefit from a bit more structure or detail. Still, it is efficiently front-loaded and directly states the action.

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 tool with 3 parameters and no output schema, the description covers the core functionality. However, it lacks details on ordering, pagination behavior (limit), and prerequisites for decryption. It is adequate but not fully complete for an agent to use effectively without additional inference.

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 coverage is 100% with descriptions for all three parameters. The description adds 'optional decryption' which aligns with the decrypt parameter, but does not add significant new meaning beyond what the schema already provides. Baseline score of 3 is appropriate.

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?

Description clearly specifies the verb 'Retrieve' and the resource 'encrypted messages from account history', with optional decryption. It distinguishes from sibling tools like get_account_history and decrypt_message by focusing on encrypted messages and combining retrieval with optional decryption.

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?

No guidance on when to use this tool versus alternatives. For example, it doesn't mention that decrypt_message might be used separately if decryption is always needed, or that get_account_history is for broader history. The description lacks use case differentiation.

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