Event Details

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

With readOnlyHint=false and idempotentHint=false in the annotations, the description adds genuinely non-derivable behavior: the call may consume paid API credits, demands confirm=true, and that these 'read-like POST requests do not publish to social platforms.' That last clause usefully explains why a non-read-only POST is still effectively a read. It omits error/failure behavior when credits run out.

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?

Three short sentences, front-loaded with the core action, then cost/confirm constraints, then a clarification about the POST semantics. Nothing is redundant, though the newline-joined first two lines could be merged for tighter flow.

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?

Cost and confirmation requirements are covered, but a notable ambiguity is unaddressed: required is empty and both id and url are optional, so the description should say which identifier is preferred or what happens when neither is supplied. No output schema exists, so return values need not be described, but identifier-selection guidance is a real gap.

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 id, url, account and confirm are already documented in the schema; the description's 'by its URL or id' merely restates it. Baseline 3 applies since the description adds no syntax or selection rule beyond the schema.

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 verb and resource ('Get a specific event by its URL or id'), which cleanly separates it from the listing/search siblings facebook_events_events and facebook_events_search_events. It stops short of naming those siblings, so an agent must infer the routing.

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?

The description supplies a hard prerequisite ('requires confirm=true') and a cost warning, which is actionable context. However, it never says when to prefer this tool over facebook_events_events or facebook_events_search_events, and there is no exclusion guidance, so usage is only implied.

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