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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and closed-world scope, so the safety profile is fully covered by structured data. The description adds that the response contains a URL and metadata, which is useful, but says nothing about failure behavior for missing paths or whether reads are cached/stale.

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?

The purpose is front-loaded in a single tight sentence, followed by a conventional Args block. Nothing is padded, though the restated 'project_id: The project ID.' line is dead weight.

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 an output schema present, the return shape need not be described, and a read-only single-entity lookup has little behavioral surface to cover. Both required parameters are at least named in the description, so an agent has enough to invoke it correctly; only error/missing-path behavior is unaddressed.

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 0%, so the description must carry the parameter burden. It does give the 'path' format and a concrete example ('images/photo.jpg') and notes it is relative to the project, which is genuine added meaning. But 'project_id' is explained only as 'The project ID.', a tautology that adds nothing.

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 ('Get a single asset') plus the lookup key ('by path') and what comes back ('URL and metadata'), which cleanly separates it from list_assets and get_asset_upload_urls. It stops short of naming those siblings explicitly, so it is clear but not fully self-differentiating.

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?

The word 'single' implies this is for one already-identified asset rather than enumeration, which implicitly routes the agent away from list_assets. However, there is no explicit when-to-use statement, no exclusion, and no mention of what to do if the path does not exist or whether get_asset_upload_urls is the counterpart for writing.

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