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

Annotations only tell the agent it is non-read-only, open-world and non-destructive; the description adds real context beyond that — anti-scam/block enforcement, a 60-per-minute rate limit, and a prompt-injection caveat that seller/buyer-authored text is returned as data. It also clarifies the scope boundary that payment/address data never flows through chat. Return shape and pagination behaviour remain undisclosed.

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?

It is short and the safety/scope statements are front-loaded, so nothing is padded. However the telegraphic keyword style ('IDs/revisions, you/counterparty, flags') reads as compressed notes rather than sentences an agent can parse confidently, costing clarity without saving much space.

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 an 8-parameter tool with low schema coverage, no output schema and mixed read/write behaviour, the description covers safety, rate limits, scope exclusions and injection risk reasonably well. It is still incomplete on what each action does, how pagination (index/before_id) works, and what a send returns, which matters given the mutation-capable annotation profile.

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 only 38%, so the description must carry weight, but its 'IDs/revisions, you/counterparty, flags' fragment is too vague to map onto message_id, before_id, reply_to_message_id or index. The action enum (list/send/attachment) and the max-3 index are never explained in the description, leaving more than half the parameters undocumented in both places.

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 opens with the noun phrase 'Order chat (chat:context)' followed by a compressed keyword list ('IDs/revisions, you/counterparty, flags, Agent attribution') rather than a clear verb+resource statement. Combined with the sibling names it is inferable that this handles listing/sending order messages, but the agent must reconstruct the actual operations (list/send/attachment) from the schema enum. It does at least distinguish itself from edit/recall siblings via 'Corrections: separate tools/consent'.

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 funds/order changes' and 'Corrections: separate tools/consent' give explicit exclusions and point to alternatives (webaz_order_chat_edit / webaz_order_chat_recall), and 'Address, contact and payment details move through the order and approval flow, not chat' further routes the agent elsewhere. What is missing is a positive 'use this when…' trigger, so it stops short of a 5.

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