Get an rbxasset:// URL for a workspace file (UNC getcustomasset)

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

Goes well beyond the annotations: explains the state-mutation is a side-effect file copy into the Roblox content cache, requires the UNC getcustomasset function, is type-guarded and pcall-wrapped, and specifies exact error shapes and return values. This is rich behavioral context an agent cannot get from the schema alone.

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?

Front-loads the core purpose and the critical executor-vs-game caveat in the first two sentences. The trailing metadata block (phase, cost, idempotency, produces/verify) is somewhat templated and partly restates annotation hints, but remains dense and mostly informative.

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 compensates fully by documenting the return shape ({ path, asset } or { error }), failure modes, and prerequisites (active-client, explicit-mutation-approval). An agent has everything needed to invoke it 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 description coverage is 100%, so path, threadContext, and timeoutMs are already documented in the schema. The description restates the signature but adds no new syntax, format, or constraint detail, 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 and resource: turn a workspace file into an rbxasset:// content URL usable as an asset id. It clearly distinguishes itself from the game-side file tools by stressing the path is relative to the executor's workspace, not the Roblox game.

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 clear context for when to reach for it (exposing an executor-workspace file as an in-game asset id) and explains the executor-vs-game path semantics. It does not name alternative sibling tools or state explicit exclusions, so it stops short of full when/when-not guidance.

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