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

Annotations already cover read-only, idempotent, non-destructive and closed-world semantics, so the bar is lower. The description still adds real value by disclosing what the response contains — freshness, missing-data, plausibility and threshold observations — which is important with no output schema. It stops short of noting pagination behavior or limits.

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 compact sentences, front-loaded with the selection condition. The second sentence partly restates the first ("Read telemetry only" vs. "Use this when checking telemetry"), but the added detail about observation types keeps it earning 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 zero-required-parameter read tool this covers purpose and output content adequately, but five undocumented parameters and no output schema leave real gaps: time-range semantics, asset/sensor scoping, and pagination defaults are all unstated.

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?

All five parameters (from, until, assetId, sensorId, pageSize) have 0% schema description coverage, so the description carries the full burden — and it says nothing about any of them. There is no mention of time-window semantics, defaults, single-asset vs. fleet scope, or the pageSize cap of 100.

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 resource (telemetry / sensor readings) and the aspect being checked (freshness), which is more precise than the title alone. It implicitly separates itself from the drafting and work-order siblings by being a read-only observation tool, though it never names a sibling explicitly.

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 an explicit when-to-use ("when checking telemetry and its freshness") and clear exclusions ("not for controlling equipment or certifying safety"). The exclusions are stated by category rather than by naming an alternative tool, so the agent still has to infer which sibling covers control/safety-adjacent asks.

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