cos_set_bucket_private

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

With no annotations provided, the description carries the behavioral disclosure burden. It discloses that this is an overwriting PUT operation that replaces the bucket ACL, and explains the security rationale. It could further warn about the impact on intentionally public content, but the core mutating behavior and result are clear.

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 two sentences with no filler. The first sentence states the exact operation and mechanism; the second gives the practical use case. It is front-loaded and every clause contributes.

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?

The tool is simple, parameters are fully schema-documented, and the description explains both the action and the security context. It does not describe the response or post-verification steps, but for a straightforward ACL-setting operation the description is sufficiently complete 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 100%, so both parameters are already documented in the schema. The description adds no additional parameter-level detail, which is acceptable given the schema fully handles parameter semantics. Baseline 3 applies.

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 uses a specific verb and resource: it explicitly sets the COS bucket ACL to private read/write via an overwrite PUT with ACL='private'. It clearly distinguishes itself from the read-only siblings like cos_get_bucket_acl and cos_check_public_read by stating the mutating action and target state.

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 provides clear usage context: it is meant to remediate the security risk where public-read access allows anonymous access to sensitive objects. It does not explicitly state when not to use it or mention alternative/complementary tools, but the intended scenario is unambiguous.

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