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

With no annotations, the description carries the full burden and does so well: it discloses the per-call price and x402 scheme, chain (eip155:8453), that only EOA EIP-712 payments work while ERC-1271/6492 are unsupported, a 64 KiB body cap, an experimental price caveat, and that input facts are unauthenticated. It also states dedup and conflict-rejection behavior. It does not say what the response looks like, which keeps it below 5.

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 information-dense with no filler sentences, but it is a single long semicolon chain that leads with cost/payment metadata instead of the primary purpose. The core verb is in the opening clause but competes with the pricing bracket for attention, and the caveats at the end are easy to miss.

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 paid, batching tool with no output schema, it covers cost, auth constraints, payload limits, and trust caveats well. It does not describe the returned structure or what happens to a batch containing a conflicting event ID (error vs. partial result), which matters for correct invocation.

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%, so the description must compensate, and it does: it establishes the 1000-event cap, UTC ordering, that null event_time entries are preserved, that identical retransmissions are dropped, that conflicting event_ids are rejected, and that evidence_refs are references only. These add real meaning beyond the bare array/object schema, though it does not clarify the source/event_type/mission_id fields at all.

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 operation on a specific resource: 'Order up to 1000 supplied agent events in UTC' with dedup, rejection, and undated-event preservation rules. An agent can tell it is a timeline-ordering tool. It does not need sibling differentiation because no sibling performs timeline ordering, but the purpose is buried behind a payment-bracket prefix rather than front-loaded.

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?

There is no explicit when-to-use or when-not-to-use guidance, and no alternative named. The processing rules (dedup, reject conflicting IDs) describe behavior, not invocation context. An agent has to infer that this is the tool to call when it has a batch of agent events needing chronological ordering.

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