Replace a channel-less draft's content in full, and optionally set the content item's target date in the same write. The draft needs text or at least one asset. Only valid while the content item is still a draft. This API is an early preview and can change without a deprecation period.

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

Annotations already declare destructiveHint, non-idempotent, and open-world, so the safety profile is covered. The description adds value beyond them by requiring explicit confirmation, stating the draft-only precondition, warning that the API is an unstable preview, and noting that provider errors are failures even at HTTP 200.

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 first three sentences duplicate the title verbatim, which is wasted space in an already long definition. The genuinely new information ('Requires explicit confirmation', the fields hint, the HTTP 200 error note) is appended at the end rather than front-loaded.

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 destructive, multi-parameter mutation with no output schema, the definition covers preconditions, confirmation, and error semantics adequately. It stops short of describing what happens to pre-existing assets/content when the draft is replaced, which is the one behaviour an agent would still want confirmed.

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 89%, so the schema already documents nearly every parameter and nested field in detail. The description adds only a hint that 'upstream fields bound data' (touching the fields param) and nothing about tagIds, targetDate semantics, or payload_file, so it does not meaningfully exceed the schema baseline.

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 states a specific verb and resource ('Replace a channel-less draft's content in full'), and the draft-only precondition plus optional target-date write distinguishes it from create_content_item_draft and update_content_item. An agent can route to it without opening a sibling schema.

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?

It gives clear preconditions for use: the item must still be a draft, the draft needs text or at least one asset, and explicit confirmation is required. It does not, however, name the alternative tool to use when the item is no longer a draft, leaving that inference to the agent.

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