Get Letter

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

Annotations already declare readOnly, idempotent, and non-destructive behavior. The description adds context by specifying the return payload ('full letter record, including the markdown body, as JSON'), which is beyond the annotations. It does not describe error behavior, but that is less critical given the strong annotation coverage.

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 two short sentences that are front-loaded with the verb and resource. Every sentence adds necessary information (action + return format) with zero fluff or redundancy.

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 low complexity (one parameter) and rich annotations, the description adequately covers the tool's purpose, identifier input, and return format. It lacks explicit error-handling semantics (e.g., 404 behavior) but is otherwise complete for a simple read tool.

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% for the single parameter 'id', which already describes 'Letter id or slug'. The description repeats this information without adding new syntax, format, or edge-case details. Thus it meets the baseline but does not enhance beyond the schema.

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 states a specific action ('Fetch') with a specific resource ('a single Playbook letter') and identifier type ('by id or slug'). It clearly distinguishes from sibling tools like list_letters (multiple letters) or mutation tools like create_letter/update_letter.

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 for retrieving a single specific letter but does not explicitly mention when to use this tool versus alternatives such as list_letters or get_page_content. There are no explicit exclusions or alternative tool references, though the context makes the primary use case clear.

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