Excel MCP Server

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add_sheet

Add a new worksheet with data to an existing Excel file, specifying sheet name, data arrays, optional headers, and insertion position.

Instructions

Add a new sheet to an existing Excel file

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {
      "filePath": "<filePath>",
      "sheetName": "<sheetName>",
      "data": "<data>"
    },
    "name": "add_sheet"
  }
}

Input Schema

Name	Required	Description
`filePath`	Yes	Path to the existing Excel file (.xlsx or .xls)
`sheetName`	Yes	Name for the new sheet
`data`	Yes	Array of arrays representing rows of data
`headers`	No	Optional headers for the first row
`position`	No	Position to insert the sheet (0-based index, optional)

Schema Changelog

Changes observed during successful MCP inspections.

First observedv1.0.0Jan 2, 2026

TDQS

C2.9/5.0

Behavior2/5

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

With no annotations provided, the description carries full burden for behavioral disclosure. It states 'Add a new sheet' which implies a write/mutation operation, but doesn't disclose critical traits like whether it modifies the original file in-place, requires write permissions, handles errors (e.g., duplicate sheet names), or what happens if the file doesn't exist. This leaves significant gaps for a mutation tool.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is a single, efficient sentence with zero wasted words. It's appropriately sized for the tool's complexity and front-loads the core purpose immediately.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness2/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a mutation tool with no annotations and no output schema, the description is insufficiently complete. It doesn't explain what the tool returns (success/failure indicators, sheet reference), doesn't cover error conditions or constraints, and provides minimal behavioral context. The 100% schema coverage helps with parameters but doesn't compensate for the overall context gap.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 100%, so the schema fully documents all 5 parameters. The description adds no additional parameter semantics beyond what's in the schema - it doesn't explain relationships between parameters (e.g., how 'data' interacts with 'headers') or provide usage examples. Baseline 3 is appropriate when schema does all the work.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the action ('Add a new sheet') and target resource ('to an existing Excel file'), providing a specific verb+resource combination. However, it doesn't differentiate from sibling tools like 'write_multi_sheet' or 'write_file' that might also modify Excel files, so it doesn't fully distinguish from alternatives.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines2/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description provides no guidance on when to use this tool versus alternatives. It doesn't mention prerequisites (e.g., file must exist), exclusions, or compare with sibling tools like 'write_multi_sheet' for multi-sheet creation or 'write_file' for file-level operations.

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