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Excel MCP Server

Excel MCP Server

by ishayoyo
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TypeScript
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vlookup_helper

Perform VLOOKUP operations in Excel with intelligent error handling and fuzzy matching capabilities to retrieve data from lookup tables.

Instructions

Intelligent VLOOKUP setup and execution with error handling and fuzzy matching

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": {
      "sourceFile": "<sourceFile>",
      "lookupFile": "<lookupFile>",
      "lookupColumn": "<lookupColumn>"
    },
    "name": "vlookup_helper"
  }
}

Input Schema

NameRequiredDescriptionDefault
sourceFileYesFile with data that needs lookup values
lookupFileYesFile to lookup values from
lookupColumnYesColumn name or index to match on
returnColumnsNoColumns to return from lookup table (empty = all except lookup column)
fuzzyMatchNoEnable fuzzy string matching for lookups (default: false)
handleErrorsNoAuto-handle #N/A errors with fallbacks (default: true)
sourceSheetNoSheet name for source Excel file (optional)
lookupSheetNoSheet name for lookup Excel file (optional)

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv1.0.0

TDQS

B3.1/5.0
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 mentions 'error handling and fuzzy matching' but doesn't specify what errors are handled, what fallbacks are used, how fuzzy matching works, or any performance characteristics. For a tool with 8 parameters and no annotations, this leaves significant behavioral gaps.

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 phrase that packs key information: the core function (VLOOKUP), setup/execution scope, and two main features. Every word earns its place with no redundancy or wasted space.

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

Completeness3/5

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

For a tool with 8 parameters, no annotations, and no output schema, the description is moderately complete. It identifies the tool's domain and key features but lacks details on behavior, output format, and usage context. Given the complexity, it should provide more guidance on what the tool returns and how it differs from alternatives.

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?

The schema description coverage is 100%, so all parameters are documented in the schema. The description adds minimal value beyond the schema by mentioning 'fuzzy matching' and 'error handling' which correspond to parameters, but doesn't provide additional semantic context. This meets the baseline for high schema coverage.

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 tool's purpose as 'Intelligent VLOOKUP setup and execution with error handling and fuzzy matching', which specifies the verb (VLOOKUP setup/execution) and key capabilities. However, it doesn't explicitly differentiate from sibling tools like 'search' or 'find_duplicates' that might also perform lookups, keeping it from a perfect score.

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. With many sibling tools like 'search', 'find_duplicates', and 'smart_data_analysis' that might handle similar tasks, there's no indication of specific contexts, prerequisites, or exclusions for this VLOOKUP tool.

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

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