set_cell_span

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

With no annotations, the description must cover behavioral traits. It states 'Replaces existing values if present,' indicating idempotency. However, it does not disclose potential side effects like reflow or failure modes (e.g., invalid cell address), leaving 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?

The description is three sentences, each carrying essential information: purpose, addressing method, and value constraints. It is front-loaded and contains no redundancy or unnecessary words.

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?

Given the tool's simplicity (setting a cell span) and absence of output schema, the description covers the core: how to specify the cell, constraints on span values, and replacement behavior. It does not mention error handling, but for a targeted setter, this is sufficient.

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 0%, so the description must explain parameters. It explains row_index and column_name via addressing, and row_span/col_span constraints. However, the 'path' and 'tablix_name' parameters are not described, leaving two of six parameters undocumented.

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 the action: 'Set <RowSpan> and/or <ColSpan> on a tablix cell.' It specifies the cell addressing method with row_index and column_name. This verb-resource combination is specific and distinguishes it from sibling tools, none of which target cell span.

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 explicit usage constraints: at least one of row_span or col_span must be supplied, both must be >= 1, and passing 1 resets a span. It does not discuss when to avoid using this tool or mention alternatives, but the narrow purpose reduces the need.

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