Handler
A2A protocol client for your terminal
Install / Use
claude mcp add alDuncanson -- npx -y github:alDuncanson/HandlerIf the server publishes to npm under a different name, use that package instead — check the repo README.
MCP Server
Model Context Protocol server
Quality Score
Category
AI & Machine LearningSupported Platforms
Our assessment of Handler
Handler scores 68/100 on our quality scale, 907th of 966 AI & Machine Learning skills we index.
Its MCP Server is 2.2 KB long, split into 5 sections with 9 code examples: moderately detailed.
It has 47 GitHub stars, so there is little community track record yet; judge it on its content.
Maintenance, license and trust
- The repository was last updated today, so Handler is actively maintained.
- Our last check on 2026-10-21 found the source still online.
- It is released under GPL-3.0, a copyleft license: you can use it, but modified versions you distribute must carry the same license.
- Its trust signals score 92/100, with 1 caution from licensing, adoption, age or documentation. These come from repository metadata, not a code audit — read the skill file before letting an agent act on it.
Safety scan
No issues foundOur scan of the whole file found no instruction hijacking, hidden characters, credential access, data exfiltration or destructive commands. An AI review of the same text found nothing harmful.
AI review by kimi-k2.7-code on 2026-09-24. Automated pattern scan on 2026-09-24. It catches known dangerous patterns, not every risk — read a skill before letting an agent act on it.
Handler compared with similar skills
All 4 of these similar skills score higher than Handler; compare them before choosing.
| Skill | Score | Stars | Updated | Format |
|---|---|---|---|---|
| Handler (this skill)by alDuncanson | 68 | 47 | today | MCP Server |
| claude-memby thedotmack | 100 | 113.5k | today | CLAUDE.md |
| Agent-Reachby Panniantong | 100 | 109.2k | today | CLAUDE.md |
| Understand-Anythingby Egonex-AI | 100 | 90.9k | 10d ago | CLAUDE.md |
| headroomby headroomlabs-ai | 100 | 78.9k | today | CLAUDE.md |
Frequently asked questions
- How do I install Handler?
- Run
claude mcp add alDuncanson -- npx -y github:alDuncanson/Handler. The install tabs above show the steps for each supported agent. - Which AI agents does Handler work with?
- It is written for Claude Code and Claude Desktop, as a MCP Server file. Other agents that read the same format can often use it too.
- Is Handler safe to use?
- Our scan of the whole file found no instruction hijacking, hidden characters, credential access, data exfiltration or destructive commands. An AI review of the same text found nothing harmful. It is GPL-3.0-licensed and scores 92/100 on trust signals. Skills are instructions an agent will follow, so read the file before installing it and do not approve commands you do not understand.
- Is Handler still maintained?
- The repository was last updated today, so Handler is actively maintained.
Skill content
View source on GitHubHandler
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.
Install
Install Handler from the PyPI package as a uv tool:
uv tool install a2a-handler
Or with pipx:
pipx install a2a-handler
Or with pip:
pip install a2a-handler
Quick Start
Open the interactive terminal UI:
handler tui
Inspect an A2A server's agent card:
handler card get --url http://localhost:8000
Send a message from the CLI:
handler message send --url URL --text "hello"
Open the full documentation:
handler docs
Run Without Installing
Run Handler with uvx:
uvx --from a2a-handler handler
Run Handler with pipx:
pipx run a2a-handler
Documentation
Read the documentation at https://handler.alduncanson.com.
Related Skills
claude-mem
113.5kPersistent Context Across Sessions for Every Agent – Captures everything your agent does during sessions, compresses it with AI, and injects relevant context back into future sessions. Works with Claude Code, OpenClaw, Codex, Gemini, Hermes, Copilot, OpenCode + More
Agent-Reach
109.2kGive your AI agent eyes to see the entire internet. Read & search Twitter, Reddit, YouTube, GitHub, Bilibili, XiaoHongShu — one CLI, zero API fees.
Understand-Anything
90.9kGraphs that teach > graphs that impress. Turn any code into an interactive knowledge graph you can explore, search, and ask questions about. Works with Claude Code, Codex, Cursor, Copilot, Gemini CLI, and more.
headroom
78.9kCompress tool outputs, logs, files, and RAG chunks before they reach the LLM. 20% fewer tokens for coding agents, 60-95% fewer tokens for JSON, same answers. Library, proxy, MCP server.
Languages
Trust signals
From repository metadata: license, adoption, age and documentation. Not a code audit — see the Safety scan above for what the skill file itself contains.