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

readOnlyHint=true already declares the safety profile, so the description's job is to add context — and it does, by enumerating the returned sub-resources (addresses, items, fulfillments, event log) and giving the underlying endpoint. What it does not cover is failure behavior (nonexistent order_id) or project scoping effects. Given the annotation coverage, this is solid added value rather than a gap.

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?

Two sentences, front-loaded with the payload contents, then the id provenance. Nothing is wasted, though the raw endpoint path is the least load-bearing element for an agent that never calls HTTP directly.

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 carries the burden of telling the agent what a call returns, and it does so by listing the embedded entities. Two parameters, both documented, one required. The only omissions are error semantics and whether the event log is truncated.

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 the baseline is 3; the description earns an extra point by telling the agent where order_id comes from ('the id field from channable_list_orders'), which is cross-tool semantics the schema cannot express. project_id is left entirely to the schema, which does document its default, so nothing critical is missing.

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 names a specific resource (one order) and enumerates exactly what comes back — customer, addresses, items, status, fulfillments, event log — so the agent knows this is a single-record fetch, not a list. It also anchors order_id to channable_list_orders, which separates it from the sibling list tool. The retrieval verb itself is only implicit in the fragment, relying on the title 'Get an order' to carry it.

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 only implied: the note that order_id is 'the id field from channable_list_orders' sketches the list-then-get workflow. There is no explicit statement of when to prefer this over channable_list_orders or what happens if the id is unknown. An agent can infer the path, but it is inference rather than guidance.

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