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

No annotations are present, so the description must carry the full burden. It states 'live-fetch', indicating real-time data retrieval. However, it does not disclose if the operation is read-only, whether there are rate limits, whether caching applies, or what happens in error cases. The behavioral transparency is minimal.

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 description is very short (single sentence) and technically concise, but it sacrifices necessary detail. While it front-loads the key information, it does not earn its place because it omits parameter info and usage context. A score of 3 reflects adequate brevity yet significant incompleteness.

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?

Given the low complexity (1 parameter, no output schema), the description should be able to provide complete context. However, it lacks any mention of the parameter, return format, time frame, or data sources beyond 'FRED calendar'. The agent cannot fully understand what this tool returns or how to use it without additional assumptions.

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% and the description does not mention the sole parameter 'limit' or its default value of 25. The description adds no meaning beyond the input schema, which itself provides no documentation. This is insufficient for correct tool invocation.

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 clearly states it provides 'Upcoming US economic release dates' from 'FRED calendar, live-fetch', which is a specific verb+resource. However, it lacks an explicit verb like 'Get' or 'List', but the intent is clear. It distinguishes from siblings like 'macro' or 'earnings' by specifying US economic release dates. A 4 is appropriate because the verb is implied rather than explicit.

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?

No usage guidelines are provided. There is no indication of when to use this tool versus alternatives such as 'macro' or 'earnings'. The description does not mention any prerequisites, limitations, or exclusions, providing no decision-making context for the agent.

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