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

Annotations already declare readOnlyHint, idempotentHint and non-destructive, so safety is covered. The description adds genuine behavioral context by detailing exactly what is returned (title, position, timer-in-minutes, opening link) and flagging that the instructions/timer run on the page, which is valuable given no output 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?

Two tight sentences, front-loaded with the action and the return fields, then the pointer to the page. No filler; every clause 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?

For a simple two-parameter read tool with no output schema, the description does the heavy lifting by enumerating the returned fields and clarifying where the actual instructions live. Only minor gaps remain (nothing on response shape/ordering beyond the fields listed), but it is complete enough to call 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?

Schema coverage is 100%, so both parameters are already documented, including the 'first step returned' default. The description's 'by its id or its position' restates the schema's identifier-or-position semantics without adding format detail or edge cases beyond it, so the baseline 3 applies.

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 (look up) and resource (one step of a guided journey) and enumerates the fields returned (title, position, timer, link). This clearly separates it from siblings like list_sourdough_journeys or read_sourdough_book.

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 is implied by the fetch-one-step framing and the note that instructions live on the page rather than here, which gently steers the agent away from expecting body text. However, it never states when to use this versus list_sourdough_journeys or start_sourdough_journey, and names no alternatives.

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