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MCP SmallEdit

A Model Context Protocol (MCP) server that provides tools for making small, targeted edits to files using stream editors like sed and awk.

Why SmallEdit?

When making minor changes to files (fixing typos, updating version numbers, changing config values), using full file replacement is inefficient. SmallEdit provides targeted editing capabilities that:

  • Save tokens by only specifying what to change

  • Reduce errors by not rewriting entire files

  • Enable bulk operations across multiple files

  • Provide preview capabilities before applying changes

Related MCP server: MCP File Editor Server

Installation

npm install -g @bard/mcp-smalledit

Tools Available

1. sed_edit

Make small edits using sed patterns.

Examples:

// Replace all occurrences
sed_edit({
  file: "package.json",
  pattern: "s/0.1.0/0.2.0/g"
})

// Delete lines containing pattern
sed_edit({
  file: "config.ts",
  pattern: "/DEBUG_MODE/d"
})

// Preview changes first
sed_edit({
  file: "index.ts",
  pattern: "s/foo/bar/g",
  preview: true
})

2. sed_multifile

Apply patterns to multiple files.

Examples:

// Update imports across all TypeScript files
sed_multifile({
  pattern: "s/'.\\//src\\//g",
  filePattern: "*.ts",
  directory: "src"
})

// Remove console.log from all JS files
sed_multifile({
  pattern: "/console\\.log/d",
  filePattern: "*.js"
})

3. quick_replace

Simple find and replace without regex.

Examples:

// Replace text literally
quick_replace({
  file: "README.md",
  find: "version 1.0",
  replace: "version 2.0"
})

// Replace only first occurrence
quick_replace({
  file: "config.json",
  find: "localhost",
  replace: "production.server.com",
  all: false
})

4. line_edit

Edit specific lines by number.

Examples:

// Replace line 42
line_edit({
  file: "index.ts",
  lineNumber: 42,
  action: "replace",
  content: "export const VERSION = '2.0.0';"
})

// Delete lines 10-20
line_edit({
  file: "test.ts",
  lineRange: "10,20",
  action: "delete"
})

// Insert after line 5
line_edit({
  file: "imports.ts",
  lineNumber: 5,
  action: "insert_after",
  content: "import { newModule } from './new-module';"
})

5. awk_process

Process files with AWK for complex operations.

Examples:

// Sum numbers in second column
awk_process({
  file: "data.csv",
  script: "{sum += $2} END {print sum}"
})

// Extract specific columns
awk_process({
  file: "data.tsv",
  script: "{print $1, $3}",
  outputFile: "extracted.txt"
})

Configuration

Add to your MCP client config:

{
  "mcpServers": {
    "smalledit": {
      "command": "mcp-smalledit"
    }
  }
}

Common Use Cases

Version Bumping

sed_edit({
  file: "package.json",
  pattern: 's/"version": "[^"]*"/"version": "1.2.3"/g'
})

Update Import Paths

sed_multifile({
  pattern: "s|'@old/package|'@new/package|g",
  filePattern: "*.ts"
})

Remove Debug Code

sed_multifile({
  pattern: "/\\/\\/\\s*DEBUG:/d",
  filePattern: "*.js"
})

Fix Formatting

// Add missing semicolons
sed_multifile({
  pattern: "s/^\\([^;]*\\)$/\\1;/",
  filePattern: "*.ts"
})

Safety Features

  • Automatic Backups: Creates .bak files by default

  • Preview Mode: Test patterns before applying

  • Error Handling: Clear error messages for invalid patterns

  • File Validation: Checks file existence before editing

Notes

  • All file paths are relative to the current working directory

  • Backup files (.bak) are created by default unless disabled

  • Use preview mode to test complex patterns

  • Escape special characters appropriately in patterns

License

MIT -e

Known Issues

Pattern Delimiters

When using path replacements, use pipe delimiter instead of forward slash to avoid quoting issues:

// ❌ Problematic with paths
sed_edit({ pattern: "s/old/path/new/path/g" })

// ✅ Works correctly
sed_edit({ pattern: "s|old/path|new/path|g" })

Available Tools

10 tools
awk_processC

Process files using AWK for more complex operations like column manipulation, calculations, or conditional processing

Inputs: file (required), script (required), outputFile.

diff_previewC

Preview what changes would be made by showing a diff

Inputs: file (required), command (required), tool.

helpB

Get detailed help and examples for smalledit tools

Inputs: tool.

line_editC

Edit specific lines by number or range

Inputs: file (required), action (required), lineNumber, lineRange, +1 more.

list_backupsC

List all backup files in a directory

Inputs: directory, pattern.

perl_editB

Edit files using Perl one-liners (more powerful than sed, better cross-platform support)

Inputs: file (required), script (required), backup, multiline.

quick_replaceA

Simple find and replace across a file without regex

Inputs: file (required), find (required), replace (required), all.

restore_backupC

Restore a file from its most recent backup (.bak)

Inputs: file (required), keepBackup.

sed_editB

Make small edits to files using sed patterns. Efficient for single-line changes, pattern replacements, and simple text transformations.

Inputs: file (required), pattern (required), backup, preview.

sed_multifileC

Apply sed pattern to multiple files matching a glob pattern

Inputs: pattern (required), filePattern (required), directory, backup.

Tool Schema Changelog

Recent tool additions, removals, and schema changes observed during successful MCP inspections.

Loading tool schema changelog…

    TDQS

    B3.4/5.0

    Scored across 10 tools

    Disambiguation4/5

    Most tools have distinct purposes, but there is some overlap between sed_edit and perl_edit as both handle text editing with different engines, and awk_process also overlaps in processing capabilities. The descriptions help clarify differences, but an agent might occasionally confuse these for similar tasks.

    Naming Consistency4/5

    The naming follows a consistent snake_case pattern with clear verb_noun or noun_verb structures, such as awk_process, diff_preview, and line_edit. Minor deviations exist, like 'help' being a single word and 'quick_replace' using an adjective, but overall it's readable and predictable.

    Tool Count5/5

    With 10 tools, the count is well-scoped for a file editing utility server. Each tool serves a specific function, such as editing, backup management, or help, without redundancy, making it appropriate for the domain's complexity.

    Completeness4/5

    The tool set covers core file editing operations, backup management, and help, but there are minor gaps, such as no direct tool for creating or deleting files, which agents might need to work around. However, it supports common workflows like editing, diffing, and restoring backups effectively.

    Maintenance

    ActivityInactive
    ResponsivenessOutdated data

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