add_elements_to_group

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

Annotations are all false and provide little behavioral context, so the description carries the burden. It usefully discloses that the group must already exist and that element_ids supports list or range-string formats. It does not mention error behavior, duplicate handling, or whether the operation is additive-only, which keeps it at a mid score.

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 compact and front-loaded with the main purpose, followed by a concise Args block. Every sentence contributes useful information, and the bilingual repetition is not excessive.

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 simple two-parameter tool with no output schema, the description covers the essential invocation details: target group, element IDs, and supported formats. It is slightly incomplete because it does not address the ambiguous overlap with 'add_to_structure_group', but otherwise the agent has enough to call it correctly.

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%, but the description documents both parameters meaningfully: group_name is the structure group name and element_ids accepts element IDs with explicit support for list or range string '1to20'. This adds real value beyond the raw schema types.

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 clearly states a specific verb and resource: 'Add elements to an existing structure group'. It distinguishes itself from creation and removal tools by emphasizing 'existing'. However, it does not distinguish itself from the almost identically named sibling 'add_to_structure_group', so it loses the top score.

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 implies the tool is for adding elements to a group that already exists, but it provides no explicit when-to-use guidance, no exclusions, and no alternatives. Given the near-duplicate sibling 'add_to_structure_group', the absence of any routing guidance is a notable gap.

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