Devtools
A local toolkit that surfaces 23 common developer utilities through MCP tools like base64_encode, jwt_decode, uuid, hash, regex_test, and timestamp. No network calls except for QR code generation, no API keys, no configuration file needed. Reach for this when you're mid-conversation with Claude and need to decode a JWT, generate a few UUIDs, test a regex pattern, convert Unix timestamps, or look up what HTTP 418 means without breaking focus to open browser tabs. Also includes JSON diffing, cron expression parsing, color conversion between hex/RGB/HSL, and byte unit conversion. Pure local computation keeps it fast and private.
- tools
- 23
- transport
- STDIO
- last updated
- Mar 18, 2026
Tools
23 toolsPublic tool metadata for what this MCP can expose to an agent.
base64_encodeEncode text to Base64
Encode text to Base64
No parameter schema in public metadata yet.
base64_decodeDecode Base64 to text
Decode Base64 to text
No parameter schema in public metadata yet.
url_encodeURL-encode a string
URL-encode a string
No parameter schema in public metadata yet.
url_decodeDecode URL-encoded string
Decode URL-encoded string
No parameter schema in public metadata yet.
html_encodeHTML-encode special characters
HTML-encode special characters
No parameter schema in public metadata yet.
html_decodeDecode HTML entities
Decode HTML entities
No parameter schema in public metadata yet.
hashGenerate hash (MD5, SHA1, SHA256, SHA512)
Generate hash (MD5, SHA1, SHA256, SHA512)
No parameter schema in public metadata yet.
hmacGenerate HMAC signature
Generate HMAC signature
No parameter schema in public metadata yet.
jwt_decodeDecode JWT token (header, payload, expiry)
Decode JWT token (header, payload, expiry)
No parameter schema in public metadata yet.
uuidGenerate UUID v4 (1-100 at once)
Generate UUID v4 (1-100 at once)
No parameter schema in public metadata yet.
random_stringRandom hex, base64, or alphanumeric strings
Random hex, base64, or alphanumeric strings
No parameter schema in public metadata yet.
qr_generateGenerate QR code as PNG image
Generate QR code as PNG image
No parameter schema in public metadata yet.
json_formatPretty-print or minify JSON
Pretty-print or minify JSON
No parameter schema in public metadata yet.
json_diffDeep-compare two JSON objects
Deep-compare two JSON objects
No parameter schema in public metadata yet.
timestampConvert Unix ↔ ISO dates, relative time
Convert Unix ↔ ISO dates, relative time
No parameter schema in public metadata yet.
regex_testTest regex with matches and capture groups
Test regex with matches and capture groups
No parameter schema in public metadata yet.
text_statsCharacter, word, line, token count
Character, word, line, token count
No parameter schema in public metadata yet.
text_diffLine-by-line text comparison
Line-by-line text comparison
No parameter schema in public metadata yet.
number_baseConvert between binary, octal, decimal, hex
Convert between binary, octal, decimal, hex
No parameter schema in public metadata yet.
byte_convertConvert between B, KB, MB, GB, TB (SI & IEC)
Convert between B, KB, MB, GB, TB (SI & IEC)
No parameter schema in public metadata yet.
color_convertConvert hex ↔ RGB ↔ HSL colors
Convert hex ↔ RGB ↔ HSL colors
No parameter schema in public metadata yet.
http_statusLook up HTTP status code meaning
Look up HTTP status code meaning
No parameter schema in public metadata yet.
cron_explainExplain cron expressions in plain English
Explain cron expressions in plain English
No parameter schema in public metadata yet.
Sponsors
Agent CaffeineSponsoredClose your lid, come back to finished work
SnugSponsoredThe clipboard manager for the AI eraPromote your product hereReach 125k+ visitors monthly
WaxSponsoredBlock anything with supervision, without erasing your iPhonePromote your product hereReach 125k+ visitors monthly
knobsSponsoredSee your site on any phone, any day, in any languageReadme
devtools-mcp 🛠️
Swiss Army knife MCP server — 23 developer utilities with zero API keys required.
Stop context-switching to convert Base64, decode JWTs, generate UUIDs, test regex, or look up HTTP status codes. mcp-devtools-server puts all these tools directly in your AI assistant.
Quick Start
Claude Code
claude mcp add devtools -- npx mcp-devtools-server
Claude Desktop
Add to your claude_desktop_config.json:
{
"mcpServers": {
"devtools": {
"command": "npx",
"args": ["devtools-mcp"]
}
}
}
Cursor / VS Code
Add to .cursor/mcp.json or VS Code MCP settings:
{
"servers": {
"devtools": {
"command": "npx",
"args": ["devtools-mcp"]
}
}
}
No API keys. No configuration. Just works.
23 Tools Included
Details
- Repository
- github.com/kira-autonoma/devtools-mcp
- Package
mcp-devtools-server- Transport
- STDIO
- Registry
- MCP registry, active