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

Annotations already establish read-only, idempotent, closed-world behavior. The description adds useful calendar context (Umm al-Qura, expected 2027 date) but omits return behavior, timezone assumptions, and what happens when the from date is after the event.

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 text is short but front-loads a specific 2027 date rather than the tool's general purpose, and includes a promotional web page URL. It is not bloated, but the ordering is suboptimal for tool selection.

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 should explain what the count result looks like. It says 'live count' but does not specify units, format, handling of past dates, or all supported events, leaving meaningful gaps for an agent.

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 coverage is 100%, so both parameters are fully documented in the schema. The description mentions only three of the six enum events and adds no further parameter semantics beyond the schema, making the baseline 3 appropriate.

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 calculates a live countdown to Ramadan and two Eids, with a specific calendar basis. It is distinguishable from generic siblings like countdown_calculator and hijri_date_converter, though it does not explicitly name those alternatives.

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 by the Islamic holiday focus, but the description gives no explicit when-to-use guidance versus countdown_calculator or hijri_date_converter, and no exclusions. An agent can infer the domain but must decide selection on its own.

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