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

Annotations already declare readOnlyHint=true, destructiveHint=false, and openWorldHint=false, establishing the safety profile. The description adds relevant behavioral context — that recaps are Lunafic's story-so-far memory and often obviate full chapter reads — but doesn't cover pagination or output structure. With annotations carrying the safety burden, a 3 reflects moderate added value.

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?

Three sentences, front-loaded with the core content list, followed by a usage directive and a sibling pointer. Slightly dense in the first sentence but 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?

Given a single well-documented parameter, rich annotations, and no output schema, the description covers the returned fields and routes to get_story_status for stats. The lack of an output schema means the field list is genuinely helpful, though it could be slightly more explicit about the shape of the chapter list.

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% and the schema already documents storyId ('from list_stories'). The description adds no parameter syntax or format details beyond what the schema provides. Baseline 3 is appropriate when the schema does the heavy lifting.

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 verb and resource ('One story's overview') and enumerates the returned contents: world, player character, chapters in reading order with word count and recap. It also differentiates from siblings by naming get_story_status for character stats and contrasting with read_chapter.

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?

Explicitly says 'Start every analysis here' and that recaps answer most questions without reading full chapters — a clear when-to-use directive with an implied alternative (read_chapter) that it steers the agent away from.

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