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

Annotations already declare readOnly, idempotent, non-destructive, closed-world, so the safety profile is fully covered. The description adds two useful facts — the content it exposes and that it is free ("No paid generation") — but says nothing about return shape, caching, or versioning of the contract.

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 compact sentences with the verb and content type front-loaded; no filler. The arrow notation and "Separate immutable Library assets..." clause are terse to the point of being slightly opaque, but nothing is wasted.

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 zero-param, read-only reference tool with no output schema and annotations that fully cover safety, the description adequately tells the agent what specification material it will receive. Minor gap: it does not describe the returned document's structure or how it relates to the sibling *_schema tools.

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?

The tool takes zero parameters, so per the rubric the baseline is 4. Nothing in the description contradicts or needs to compensate for parameter documentation.

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 enumerates the resource content (building/district contract, example, limits, plan → build workflow), and the closing "No paid generation" separates it from the many generation siblings. It is less crisp about what distinguishes it from the other *_schema tools (scene_schema, map_schema), which keeps it from a 5.

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 only implied — the agent infers it should read this before planning/building, and "No paid generation" is a single exclusion. There is no explicit statement of when to prefer this over sibling schema/reference tools such as gripforge_scene_schema or gripforge_map_schema.

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