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

Annotations already declare readOnlyHint/idempotentHint/destructiveHint=false, and the description adds real substance on top: it is 'one indexed read', does not fetch the origin, does not write to the database, and does not circumvent access refusals or CORS. That is meaningful behavioral context beyond the safety flags, though return structure and pagination are not described.

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 return contents reasonably, but runs six sentences with implementation trivia (port absence, HTTPS hop, lang/theme on an external page) that does not affect how the agent calls this tool.

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 does its job of sketching return contents and confirming the operation is a non-mutating read. Only the exact response fields and error behavior are left implicit.

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% for the single 'id' parameter, so the schema already carries the semantics; the description's note about old IDs roughly repeats it. The lang/theme mention describes the standalone page rather than a tool parameter and could mislead an agent into thinking those are passable arguments.

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 explains what is returned (official site, stream URL, legacy HTTP player) but never states a clean verb+resource like 'retrieve stream metadata'. It is distinguishable by name and content from list/search siblings, but no explicit contrast is drawn with close relatives such as get_channel, so the agent must infer the boundary.

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?

There is no when-to-use guidance and no named alternative — nothing tells the agent when to prefer legacy_stream over get_channel or the other stream/health tools. The URL-shape notes are informational rather than selection criteria.

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