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

With no annotations, the description carries the behavioral burden and does well: it discloses the default date range, the effect of omitting dates, and the important semantic caveat that results are exchange-level additions rather than live assignment events. It does not discuss pagination, rate limits, or authentication behavior beyond what the schema already states.

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?

Four concise sentences with the core purpose, usage contexts, date default, and output semantics front-loaded. Every sentence adds useful information and there is no filler.

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?

The description covers purpose, usage contexts, default date behavior, and the key distinction from live assignment events. For a read-only list tool with 100% schema coverage and no output schema, this is nearly complete, though it could explicitly state the return format or pagination behavior.

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%, so parameter meanings are already documented in the schema. The description adds useful default behavior for date omission and mentions state-filtered monitoring, but does not add format or syntax details beyond the schema's YYYY-MM-DD note.

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 states a specific verb and resource ('List newly assigned TelcoData exchanges') with date-range scope, and explicitly distinguishes the output from live telephone-number assignment events. This lets an agent separate it from siblings like lookup_tn or search_record_history without opening schemas.

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?

It gives clear usage contexts: recent numbering activity, new prefix reports, and state-filtered change monitoring. It also explains the default 30-day window and when to pass explicit dates, though it does not name a specific alternative sibling tool for overlapping queries.

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