Handler is an MCP server that A2A protocol client for your terminal. Its tool list has not been published yet over sse, requires no API key, and scores 60/100 on MCPpedia's security, maintenance and efficiency rubric.
Step 1
Install in your client
Config is the same across clients - only the file and path differ.
CD
Supported in Claude Desktopsse · Node 18+
Paste into ~/Library/Application Support/Claude/claude_desktop_config.json
{
"mcpServers": {
"handler": {
"args": [
"a2a-handler"
],
"command": "uvx"
}
}
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What Handler does
Handler is an open-source A2A protocol client for software engineers building, testing, and operating agentic systems. It provides an interactive TUI, a scriptable CLI with structured output, and an MCP server that lets other agents integrate with A2A services directly. Handler also supports global and repo-scoped A2A server configuration with bearer, API key, mTLS, and OAuth2 client credentials auth.
Test This Server
This server supports HTTP transport. Be the first to test it - help the community know if it works.
Scored, not listed
Why this score
Five weighted categories - click any category to see the underlying evidence.
Score breakdown
60/100across 5 weighted dimensions
0255075100
23
13
14
10
−40
Security
Maintenance
Efficiency
Documentation
Compatibility
Categoriesclick a row to see evidence
Security
OSV.devNo known CVEs.
Checked a2a-handler against OSV.dev.
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Frequently Asked Questions
- Is Handler safe to use?
- Handler has no known CVEs as of the latest MCPpedia security scan. Authentication requirements were not detected automatically - check the project's documentation before connecting in a shared environment. Licensed under GPL-3.0.
- How do I install Handler?
- Handler supports copy-paste install configs on its MCPpedia page for Claude Desktop, Cursor, and Claude Code. Scroll to the Quick Install section and select your client.
- What AI clients work with Handler?
- Handler is compatible with claude-desktop, cursor, claude-code. It uses sse transport.
- Is Handler actively maintained?
- Handler is actively maintained - last commit was 7 days ago. It has 45 GitHub stars.
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