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

Annotations already cover the read-only safety profile, but the description adds genuinely new behavior: ownership requirement, the guarantee that this tool cannot mutate values, and the return scope (character values plus last 20 changes by story or player). No contradictions.

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?

One dense, front-loaded sentence with no filler; scope, return shape, safety and ownership are packed in efficiently. Minor awkwardness from the possessive 'stories' Status' phrasing but nothing wasteful.

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?

With no output schema, the description correctly carries the return-value burden by specifying current character values and the last 20 changes. Combined with the owner-only and read-only statements, an agent has enough to call it correctly; only an explicit sibling comparison is missing.

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?

Only one parameter and schema description coverage is 100% ('storyId from list_stories'), so the schema fully documents it. The description adds nothing about the parameter itself, which matches the baseline 3 when the schema does the work.

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 (Read) and resource (story Status), and defines what that resource contains: every character's current values plus the last 20 changes. This distinguishes it from get_story and get_world_status implicitly through the 'story' scope, though it never names an alternative it is not.

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?

Gives a real constraint ('Owner only') and clarifies the mutation model ('values in a story change only inside Lunafic'), which implies this tool is not the way to modify values. However it never tells the agent when to pick this over get_story or set_status_start, so the usage guidance is implied rather than explicit.

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