update_media_grabbers_devices_by_device_id_channelmap

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

Annotations already indicate this is a non-read-only, idempotent, non-destructive operation, and the description's 'Set' action is consistent with those hints. It adds a small amount of behavioral context by describing the mappings as 'changes', but it does not clarify whether this replaces the entire mapping, merges changes, or how the optional parameters interact.

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 concise and front-loaded with the core action, followed by the endpoint and a structured argument list. There is no fluff, though the endpoint line partly repeats information already present in the tool name.

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 four parameters, only one required, and no output schema details in the description, an agent is left uncertain whether to supply channel_mapping, channel_mapping_by_key, both, or neither, and whether channels_enabled is necessary for the desired effect. The relationship between the optional parameters is not explained, which is a significant gap for constructing a correct request.

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 Args section carries the full burden of explaining parameters. It covers all four parameters with meaningful distinctions: device_id, channel_mapping to VCN, channel_mapping_by_key to lineup key, and channels_enabled. The descriptions are terse and 'mapping of changes' is somewhat vague, but they still add value beyond the raw schema.

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 'Set a device's channel mapping', a specific verb and resource, and the endpoint makes the target clear. It is distinct from the sibling update_media_grabbers_devices_by_device_id by naming the channelmap resource, though it does not explicitly contrast itself with that sibling.

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 guidance on when to use this tool versus alternatives such as update_media_grabbers_devices_by_device_id or update_media_grabbers_devices_by_device_id_prefs. The description implies its purpose but provides no exclusions, prerequisites, or context that would help an agent select it over similar tools.

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