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

With no annotations at all, the description carries the full burden and does real work: it discloses that the returned text is third-party authored, arrives wrapped in UNTRUSTED markers, and must be treated as data rather than instructions, plus that binary payloads are never returned. That is exactly the kind of behavioral and safety context annotations would not have supplied. It stops short of covering failure behavior (missing/unauthorized id) or permissions, which keeps it off a 5.

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 short sentences, no filler, and the most important facts (what it returns, and that the content is untrusted) are front-loaded. 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?

For a single-parameter read with no output schema and no annotations, the description covers what is returned, what is not returned, and how to treat the payload. The remaining omission is error behavior on unknown ids, which is minor for a simple lookup tool.

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?

There is one required parameter and schema description coverage is 0%, so the description must compensate. "By id" establishes that the id identifies an asset, which is slightly more than the bare `{"id": string}` schema conveys, but it says nothing about id format, whether ids are shared across asset types, or whether an id from another tool is valid here.

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?

"Read a TEXT asset by id" gives a specific verb (read), resource (asset), and scope qualifier (TEXT), and the second sentence clarifies that binary asset types are out of scope. The only gap is that it does not name any sibling by way of contrast, though the sibling list (accept, claim, edit, fork, etc.) contains no obvious read-alternative for an agent to confuse it with.

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 rather than stated: an agent can infer it should call this to fetch textual asset content and should not call it expecting image or sound bytes. There is no explicit when-to-use/when-not framing, no mention of what to do if the id is unknown, and no pointer to alternatives for non-text assets.

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