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

Annotations already establish readOnly=true, idempotent=true, openWorld=false, so the safety profile is covered. The description adds genuinely new behavioral context: the JSON holds initial configuration and parameter modifications but not full trajectories, which tells the agent what will and will not be found in the result.

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?

A single dense sentence front-loads the input requirement before the extraction list, so the critical calling convention is not buried. The semicolon-chained enumeration is slightly list-like 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?

With no output schema, the description must carry the return contract, and it does: it names the categories of data that will be read out and listed. For a one-parameter read tool this is nearly complete, missing only format/structure hints for the returned data.

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 states the value cannot be a local path or JSON string. The description nevertheless adds content-level semantics for the single parameter (it is a complete webpage-exported JSON object) plus a boundary note that trajectories are absent, going 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 verb (读取/read) and resource (网页导出的完整JSON对象) and enumerates exactly what is extracted: components, connections, external forces, contacts, time nodes, unknown symbols, analysis conditions, default parameters. This distinguishes it from write-oriented siblings like build_scene/update_scene/export_scene, but it never names a sibling or explicitly contrasts itself, so it stops short of 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 implied: pass the JSON exported from the webpage to inspect its contents. There is no explicit when-to-use, when-not-to-use, or routing statement (e.g. 'use analyze_motion to obtain trajectories instead'), leaving the agent to infer which sibling is appropriate.

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