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A2A Python SDK

LicensePyPI versionPyPI - Python VersionPyPI - DownloadsPython Unit Tests

Ask Code Wiki
A2A Logo

A Python library for running agentic applications as A2A Servers, following the Agent2Agent (A2A) Protocol.

Important

Upgrading the SDK from 0.3 to 1.0? See the v0.3 → v1.0 migration guide. For supported A2A spec versions, see Compatibility.

✨ Features

  • A2A Protocol Compliant: Build agentic applications that adhere to the Agent2Agent (A2A) Protocol.
  • Extensible: Easily add support for different communication protocols and database backends.
  • Asynchronous: Built on modern async Python for high performance.
  • Optional Integrations: Includes optional support for:

🧩 Compatibility

This SDK implements the A2A Protocol Specification 1.0, with compatibility mode for 0.3. See #742 for details on the compatibility scope.

Spec VersionTransportClientServer
1.0JSON-RPC✅✅
1.0HTTP+JSON/REST✅✅
1.0gRPC✅✅
0.3 (compat)JSON-RPC✅✅
0.3 (compat)HTTP+JSON/REST✅✅
0.3 (compat)gRPC✅✅

🚀 Getting Started

Prerequisites

  • Python 3.10+
  • uv (recommended) or pip

🔧 Installation

Install the core SDK and any desired extras using your preferred package manager.

Featureuv Commandpip Command
Core SDKuv add a2a-sdkpip install a2a-sdk
All Extrasuv add "a2a-sdk[all]"pip install "a2a-sdk[all]"
HTTP Serveruv add "a2a-sdk[http-server]"pip install "a2a-sdk[http-server]"
gRPC Supportuv add "a2a-sdk[grpc]"pip install "a2a-sdk[grpc]"
OpenTelemetry Tracinguv add "a2a-sdk[telemetry]"pip install "a2a-sdk[telemetry]"
Encryptionuv add "a2a-sdk[encryption]"pip install "a2a-sdk[encryption]"
Database Drivers
PostgreSQLuv add "a2a-sdk[postgresql]"pip install "a2a-sdk[postgresql]"
MySQLuv add "a2a-sdk[mysql]"pip install "a2a-sdk[mysql]"
SQLiteuv add "a2a-sdk[sqlite]"pip install "a2a-sdk[sqlite]"
All SQL Driversuv add "a2a-sdk[sql]"pip install "a2a-sdk[sql]"

Examples

Helloworld Example

  1. Run Remote Agent

    git clone https://github.com/a2aproject/a2a-samples.git
cd a2a-samples/samples/python/agents/helloworld
uv run .

  2. In another terminal, run the client

    cd a2a-samples/samples/python/agents/helloworld
uv run test_client.py

  3. You can validate your agent using the agent inspector. Follow the instructions at the a2a-inspector repo.

🌐 More Examples

You can find a variety of more detailed examples in the a2a-samples repository:

🤝 Contributing

Contributions are welcome! Please see the CONTRIBUTING.md file for guidelines on how to get involved.

📄 License

This project is licensed under the Apache 2.0 License. See the LICENSE file for more details.

About

Official Python SDK for the Agent2Agent (A2A) Protocol

a2a-protocol.org/latest/sdk/python/api/

Resources

Readme
License

Code of conduct

Code of conduct

Contributing

Contributing

Security policy

Security policy
Activity

Stars

0 stars

Watchers

0 watching

Forks

0 forks
Report repository

Releases

Packages

Contributors

Languages

, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all 
 blocks\n(function() {\n function addCopyButtons() {\n document.querySelectorAll('pre code').forEach(function(codeBlock) {\n if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;\n codeBlock.parentElement.setAttribute('data-copy-added', 'true');\n \n var btn = document.createElement('button');\n btn.textContent = 'Copy';\n btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';\n btn.onmouseover = function() { this.style.opacity = '1'; };\n btn.onmouseout = function() { this.style.opacity = '0.7'; };\n btn.onclick = function() {\n navigator.clipboard.writeText(codeBlock.textContent).then(function() {\n btn.textContent = 'Copied!';\n setTimeout(function() { btn.textContent = 'Copy'; }, 1500);\n });\n };\n codeBlock.parentElement.style.position = 'relative';\n codeBlock.parentElement.appendChild(btn);\n });\n }\n \n addCopyButtons();\n \n // Re-run on dynamic content\n var observer = new MutationObserver(addCopyButtons);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Add Copy Buttons to Code Blocks");
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

Skip to content
BranchesTags
Repository files navigation
A2A Python SDK
LicensePyPI versionPyPI - Python VersionPyPI - DownloadsPython Unit Tests
Ask Code Wiki
A2A Logo

A Python library for running agentic applications as A2A Servers, following the Agent2Agent (A2A) Protocol.

Important
Upgrading the SDK from 0.3 to 1.0? See the v0.3 → v1.0 migration guide. For supported A2A spec versions, see Compatibility.
✨ Features
  • A2A Protocol Compliant: Build agentic applications that adhere to the Agent2Agent (A2A) Protocol.
  • Extensible: Easily add support for different communication protocols and database backends.
  • Asynchronous: Built on modern async Python for high performance.
  • Optional Integrations: Includes optional support for:

🧩 Compatibility
This SDK implements the A2A Protocol Specification 1.0, with compatibility mode for 0.3. See #742 for details on the compatibility scope.
Spec VersionTransportClientServer
1.0JSON-RPC✅✅
1.0HTTP+JSON/REST✅✅
1.0gRPC✅✅
0.3 (compat)JSON-RPC✅✅
0.3 (compat)HTTP+JSON/REST✅✅
0.3 (compat)gRPC✅✅
🚀 Getting Started
Prerequisites
  • Python 3.10+
  • uv (recommended) or pip
🔧 Installation
Install the core SDK and any desired extras using your preferred package manager.
Featureuv Commandpip Command
Core SDKuv add a2a-sdkpip install a2a-sdk
All Extrasuv add "a2a-sdk[all]"pip install "a2a-sdk[all]"
HTTP Serveruv add "a2a-sdk[http-server]"pip install "a2a-sdk[http-server]"
gRPC Supportuv add "a2a-sdk[grpc]"pip install "a2a-sdk[grpc]"
OpenTelemetry Tracinguv add "a2a-sdk[telemetry]"pip install "a2a-sdk[telemetry]"
Encryptionuv add "a2a-sdk[encryption]"pip install "a2a-sdk[encryption]"
Database Drivers
PostgreSQLuv add "a2a-sdk[postgresql]"pip install "a2a-sdk[postgresql]"
MySQLuv add "a2a-sdk[mysql]"pip install "a2a-sdk[mysql]"
SQLiteuv add "a2a-sdk[sqlite]"pip install "a2a-sdk[sqlite]"
All SQL Driversuv add "a2a-sdk[sql]"pip install "a2a-sdk[sql]"
Examples
Helloworld Example
  1. Run Remote Agent
    git clone https://github.com/a2aproject/a2a-samples.git
cd a2a-samples/samples/python/agents/helloworld
uv run .
  2. In another terminal, run the client
    cd a2a-samples/samples/python/agents/helloworld
uv run test_client.py
  3. You can validate your agent using the agent inspector. Follow the instructions at the a2a-inspector repo.
🌐 More Examples
You can find a variety of more detailed examples in the a2a-samples repository:
🤝 Contributing
Contributions are welcome! Please see the CONTRIBUTING.md file for guidelines on how to get involved.
📄 License
This project is licensed under the Apache 2.0 License. See the LICENSE file for more details.
About
Official Python SDK for the Agent2Agent (A2A) Protocol
a2a-protocol.org/latest/sdk/python/api/
Resources
Readme
License
Code of conduct
Code of conduct
Contributing
Contributing
Security policy
Security policy
Activity
Stars
0 stars
Watchers
0 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix");
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
BranchesTags
Repository files navigation
A2A Python SDK
LicensePyPI versionPyPI - Python VersionPyPI - DownloadsPython Unit Tests
Ask Code Wiki
A2A Logo

A Python library for running agentic applications as A2A Servers, following the Agent2Agent (A2A) Protocol.

Important
Upgrading the SDK from 0.3 to 1.0? See the v0.3 → v1.0 migration guide. For supported A2A spec versions, see Compatibility.
✨ Features
  • A2A Protocol Compliant: Build agentic applications that adhere to the Agent2Agent (A2A) Protocol.
  • Extensible: Easily add support for different communication protocols and database backends.
  • Asynchronous: Built on modern async Python for high performance.
  • Optional Integrations: Includes optional support for:

🧩 Compatibility
This SDK implements the A2A Protocol Specification 1.0, with compatibility mode for 0.3. See #742 for details on the compatibility scope.
Spec VersionTransportClientServer
1.0JSON-RPC✅✅
1.0HTTP+JSON/REST✅✅
1.0gRPC✅✅
0.3 (compat)JSON-RPC✅✅
0.3 (compat)HTTP+JSON/REST✅✅
0.3 (compat)gRPC✅✅
🚀 Getting Started
Prerequisites
  • Python 3.10+
  • uv (recommended) or pip
🔧 Installation
Install the core SDK and any desired extras using your preferred package manager.
Featureuv Commandpip Command
Core SDKuv add a2a-sdkpip install a2a-sdk
All Extrasuv add "a2a-sdk[all]"pip install "a2a-sdk[all]"
HTTP Serveruv add "a2a-sdk[http-server]"pip install "a2a-sdk[http-server]"
gRPC Supportuv add "a2a-sdk[grpc]"pip install "a2a-sdk[grpc]"
OpenTelemetry Tracinguv add "a2a-sdk[telemetry]"pip install "a2a-sdk[telemetry]"
Encryptionuv add "a2a-sdk[encryption]"pip install "a2a-sdk[encryption]"
Database Drivers
PostgreSQLuv add "a2a-sdk[postgresql]"pip install "a2a-sdk[postgresql]"
MySQLuv add "a2a-sdk[mysql]"pip install "a2a-sdk[mysql]"
SQLiteuv add "a2a-sdk[sqlite]"pip install "a2a-sdk[sqlite]"
All SQL Driversuv add "a2a-sdk[sql]"pip install "a2a-sdk[sql]"
Examples
Helloworld Example
  1. Run Remote Agent
    git clone https://github.com/a2aproject/a2a-samples.git
cd a2a-samples/samples/python/agents/helloworld
uv run .
  2. In another terminal, run the client
    cd a2a-samples/samples/python/agents/helloworld
uv run test_client.py
  3. You can validate your agent using the agent inspector. Follow the instructions at the a2a-inspector repo.
🌐 More Examples
You can find a variety of more detailed examples in the a2a-samples repository:
🤝 Contributing
Contributions are welcome! Please see the CONTRIBUTING.md file for guidelines on how to get involved.
📄 License
This project is licensed under the Apache 2.0 License. See the LICENSE file for more details.
About
Official Python SDK for the Agent2Agent (A2A) Protocol
a2a-protocol.org/latest/sdk/python/api/
Resources
Readme
License
Code of conduct
Code of conduct
Contributing
Contributing
Security policy
Security policy
Activity
Stars
0 stars
Watchers
0 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length > 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms");
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
BranchesTags
Repository files navigation
A2A Python SDK
LicensePyPI versionPyPI - Python VersionPyPI - DownloadsPython Unit Tests
Ask Code Wiki
A2A Logo

A Python library for running agentic applications as A2A Servers, following the Agent2Agent (A2A) Protocol.

Important
Upgrading the SDK from 0.3 to 1.0? See the v0.3 → v1.0 migration guide. For supported A2A spec versions, see Compatibility.
✨ Features
  • A2A Protocol Compliant: Build agentic applications that adhere to the Agent2Agent (A2A) Protocol.
  • Extensible: Easily add support for different communication protocols and database backends.
  • Asynchronous: Built on modern async Python for high performance.
  • Optional Integrations: Includes optional support for:

🧩 Compatibility
This SDK implements the A2A Protocol Specification 1.0, with compatibility mode for 0.3. See #742 for details on the compatibility scope.
Spec VersionTransportClientServer
1.0JSON-RPC✅✅
1.0HTTP+JSON/REST✅✅
1.0gRPC✅✅
0.3 (compat)JSON-RPC✅✅
0.3 (compat)HTTP+JSON/REST✅✅
0.3 (compat)gRPC✅✅
🚀 Getting Started
Prerequisites
  • Python 3.10+
  • uv (recommended) or pip
🔧 Installation
Install the core SDK and any desired extras using your preferred package manager.
Featureuv Commandpip Command
Core SDKuv add a2a-sdkpip install a2a-sdk
All Extrasuv add "a2a-sdk[all]"pip install "a2a-sdk[all]"
HTTP Serveruv add "a2a-sdk[http-server]"pip install "a2a-sdk[http-server]"
gRPC Supportuv add "a2a-sdk[grpc]"pip install "a2a-sdk[grpc]"
OpenTelemetry Tracinguv add "a2a-sdk[telemetry]"pip install "a2a-sdk[telemetry]"
Encryptionuv add "a2a-sdk[encryption]"pip install "a2a-sdk[encryption]"
Database Drivers
PostgreSQLuv add "a2a-sdk[postgresql]"pip install "a2a-sdk[postgresql]"
MySQLuv add "a2a-sdk[mysql]"pip install "a2a-sdk[mysql]"
SQLiteuv add "a2a-sdk[sqlite]"pip install "a2a-sdk[sqlite]"
All SQL Driversuv add "a2a-sdk[sql]"pip install "a2a-sdk[sql]"
Examples
Helloworld Example
  1. Run Remote Agent
    git clone https://github.com/a2aproject/a2a-samples.git
cd a2a-samples/samples/python/agents/helloworld
uv run .
  2. In another terminal, run the client
    cd a2a-samples/samples/python/agents/helloworld
uv run test_client.py
  3. You can validate your agent using the agent inspector. Follow the instructions at the a2a-inspector repo.
🌐 More Examples
You can find a variety of more detailed examples in the a2a-samples repository:
🤝 Contributing
Contributions are welcome! Please see the CONTRIBUTING.md file for guidelines on how to get involved.
📄 License
This project is licensed under the Apache 2.0 License. See the LICENSE file for more details.
About
Official Python SDK for the Agent2Agent (A2A) Protocol
a2a-protocol.org/latest/sdk/python/api/
Resources
Readme
License
Code of conduct
Code of conduct
Contributing
Contributing
Security policy
Security policy
Activity
Stars
0 stars
Watchers
0 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links");
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

Skip to content
BranchesTags
Repository files navigation
A2A Python SDK
LicensePyPI versionPyPI - Python VersionPyPI - DownloadsPython Unit Tests
Ask Code Wiki
A2A Logo

A Python library for running agentic applications as A2A Servers, following the Agent2Agent (A2A) Protocol.

Important
Upgrading the SDK from 0.3 to 1.0? See the v0.3 → v1.0 migration guide. For supported A2A spec versions, see Compatibility.
✨ Features
  • A2A Protocol Compliant: Build agentic applications that adhere to the Agent2Agent (A2A) Protocol.
  • Extensible: Easily add support for different communication protocols and database backends.
  • Asynchronous: Built on modern async Python for high performance.
  • Optional Integrations: Includes optional support for:

🧩 Compatibility
This SDK implements the A2A Protocol Specification 1.0, with compatibility mode for 0.3. See #742 for details on the compatibility scope.
Spec VersionTransportClientServer
1.0JSON-RPC✅✅
1.0HTTP+JSON/REST✅✅
1.0gRPC✅✅
0.3 (compat)JSON-RPC✅✅
0.3 (compat)HTTP+JSON/REST✅✅
0.3 (compat)gRPC✅✅
🚀 Getting Started
Prerequisites
  • Python 3.10+
  • uv (recommended) or pip
🔧 Installation
Install the core SDK and any desired extras using your preferred package manager.
Featureuv Commandpip Command
Core SDKuv add a2a-sdkpip install a2a-sdk
All Extrasuv add "a2a-sdk[all]"pip install "a2a-sdk[all]"
HTTP Serveruv add "a2a-sdk[http-server]"pip install "a2a-sdk[http-server]"
gRPC Supportuv add "a2a-sdk[grpc]"pip install "a2a-sdk[grpc]"
OpenTelemetry Tracinguv add "a2a-sdk[telemetry]"pip install "a2a-sdk[telemetry]"
Encryptionuv add "a2a-sdk[encryption]"pip install "a2a-sdk[encryption]"
Database Drivers
PostgreSQLuv add "a2a-sdk[postgresql]"pip install "a2a-sdk[postgresql]"
MySQLuv add "a2a-sdk[mysql]"pip install "a2a-sdk[mysql]"
SQLiteuv add "a2a-sdk[sqlite]"pip install "a2a-sdk[sqlite]"
All SQL Driversuv add "a2a-sdk[sql]"pip install "a2a-sdk[sql]"
Examples
Helloworld Example
  1. Run Remote Agent
    git clone https://github.com/a2aproject/a2a-samples.git
cd a2a-samples/samples/python/agents/helloworld
uv run .
  2. In another terminal, run the client
    cd a2a-samples/samples/python/agents/helloworld
uv run test_client.py
  3. You can validate your agent using the agent inspector. Follow the instructions at the a2a-inspector repo.
🌐 More Examples
You can find a variety of more detailed examples in the a2a-samples repository:
🤝 Contributing
Contributions are welcome! Please see the CONTRIBUTING.md file for guidelines on how to get involved.
📄 License
This project is licensed under the Apache 2.0 License. See the LICENSE file for more details.
About
Official Python SDK for the Agent2Agent (A2A) Protocol
a2a-protocol.org/latest/sdk/python/api/
Resources
Readme
License
Code of conduct
Code of conduct
Contributing
Contributing
Security policy
Security policy
Activity
Stars
0 stars
Watchers
0 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default");
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
BranchesTags
Repository files navigation
A2A Python SDK
LicensePyPI versionPyPI - Python VersionPyPI - DownloadsPython Unit Tests
Ask Code Wiki
A2A Logo

A Python library for running agentic applications as A2A Servers, following the Agent2Agent (A2A) Protocol.

Important
Upgrading the SDK from 0.3 to 1.0? See the v0.3 → v1.0 migration guide. For supported A2A spec versions, see Compatibility.
✨ Features
  • A2A Protocol Compliant: Build agentic applications that adhere to the Agent2Agent (A2A) Protocol.
  • Extensible: Easily add support for different communication protocols and database backends.
  • Asynchronous: Built on modern async Python for high performance.
  • Optional Integrations: Includes optional support for:

🧩 Compatibility
This SDK implements the A2A Protocol Specification 1.0, with compatibility mode for 0.3. See #742 for details on the compatibility scope.
Spec VersionTransportClientServer
1.0JSON-RPC✅✅
1.0HTTP+JSON/REST✅✅
1.0gRPC✅✅
0.3 (compat)JSON-RPC✅✅
0.3 (compat)HTTP+JSON/REST✅✅
0.3 (compat)gRPC✅✅
🚀 Getting Started
Prerequisites
  • Python 3.10+
  • uv (recommended) or pip
🔧 Installation
Install the core SDK and any desired extras using your preferred package manager.
Featureuv Commandpip Command
Core SDKuv add a2a-sdkpip install a2a-sdk
All Extrasuv add "a2a-sdk[all]"pip install "a2a-sdk[all]"
HTTP Serveruv add "a2a-sdk[http-server]"pip install "a2a-sdk[http-server]"
gRPC Supportuv add "a2a-sdk[grpc]"pip install "a2a-sdk[grpc]"
OpenTelemetry Tracinguv add "a2a-sdk[telemetry]"pip install "a2a-sdk[telemetry]"
Encryptionuv add "a2a-sdk[encryption]"pip install "a2a-sdk[encryption]"
Database Drivers
PostgreSQLuv add "a2a-sdk[postgresql]"pip install "a2a-sdk[postgresql]"
MySQLuv add "a2a-sdk[mysql]"pip install "a2a-sdk[mysql]"
SQLiteuv add "a2a-sdk[sqlite]"pip install "a2a-sdk[sqlite]"
All SQL Driversuv add "a2a-sdk[sql]"pip install "a2a-sdk[sql]"
Examples
Helloworld Example
  1. Run Remote Agent
    git clone https://github.com/a2aproject/a2a-samples.git
cd a2a-samples/samples/python/agents/helloworld
uv run .
  2. In another terminal, run the client
    cd a2a-samples/samples/python/agents/helloworld
uv run test_client.py
  3. You can validate your agent using the agent inspector. Follow the instructions at the a2a-inspector repo.
🌐 More Examples
You can find a variety of more detailed examples in the a2a-samples repository:
🤝 Contributing
Contributions are welcome! Please see the CONTRIBUTING.md file for guidelines on how to get involved.
📄 License
This project is licensed under the Apache 2.0 License. See the LICENSE file for more details.
About
Official Python SDK for the Agent2Agent (A2A) Protocol
a2a-protocol.org/latest/sdk/python/api/
Resources
Readme
License
Code of conduct
Code of conduct
Contributing
Contributing
Security policy
Security policy
Activity
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0 watching
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0 forks
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers");
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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A2A Python SDK
LicensePyPI versionPyPI - Python VersionPyPI - DownloadsPython Unit Tests
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A2A Logo

A Python library for running agentic applications as A2A Servers, following the Agent2Agent (A2A) Protocol.

Important
Upgrading the SDK from 0.3 to 1.0? See the v0.3 → v1.0 migration guide. For supported A2A spec versions, see Compatibility.
✨ Features
  • A2A Protocol Compliant: Build agentic applications that adhere to the Agent2Agent (A2A) Protocol.
  • Extensible: Easily add support for different communication protocols and database backends.
  • Asynchronous: Built on modern async Python for high performance.
  • Optional Integrations: Includes optional support for:

🧩 Compatibility
This SDK implements the A2A Protocol Specification 1.0, with compatibility mode for 0.3. See #742 for details on the compatibility scope.
Spec VersionTransportClientServer
1.0JSON-RPC✅✅
1.0HTTP+JSON/REST✅✅
1.0gRPC✅✅
0.3 (compat)JSON-RPC✅✅
0.3 (compat)HTTP+JSON/REST✅✅
0.3 (compat)gRPC✅✅
🚀 Getting Started
Prerequisites
  • Python 3.10+
  • uv (recommended) or pip
🔧 Installation
Install the core SDK and any desired extras using your preferred package manager.
Featureuv Commandpip Command
Core SDKuv add a2a-sdkpip install a2a-sdk
All Extrasuv add "a2a-sdk[all]"pip install "a2a-sdk[all]"
HTTP Serveruv add "a2a-sdk[http-server]"pip install "a2a-sdk[http-server]"
gRPC Supportuv add "a2a-sdk[grpc]"pip install "a2a-sdk[grpc]"
OpenTelemetry Tracinguv add "a2a-sdk[telemetry]"pip install "a2a-sdk[telemetry]"
Encryptionuv add "a2a-sdk[encryption]"pip install "a2a-sdk[encryption]"
Database Drivers
PostgreSQLuv add "a2a-sdk[postgresql]"pip install "a2a-sdk[postgresql]"
MySQLuv add "a2a-sdk[mysql]"pip install "a2a-sdk[mysql]"
SQLiteuv add "a2a-sdk[sqlite]"pip install "a2a-sdk[sqlite]"
All SQL Driversuv add "a2a-sdk[sql]"pip install "a2a-sdk[sql]"
Examples
Helloworld Example
  1. Run Remote Agent
    git clone https://github.com/a2aproject/a2a-samples.git
cd a2a-samples/samples/python/agents/helloworld
uv run .
  2. In another terminal, run the client
    cd a2a-samples/samples/python/agents/helloworld
uv run test_client.py
  3. You can validate your agent using the agent inspector. Follow the instructions at the a2a-inspector repo.
🌐 More Examples
You can find a variety of more detailed examples in the a2a-samples repository:
🤝 Contributing
Contributions are welcome! Please see the CONTRIBUTING.md file for guidelines on how to get involved.
📄 License
This project is licensed under the Apache 2.0 License. See the LICENSE file for more details.
About
Official Python SDK for the Agent2Agent (A2A) Protocol
a2a-protocol.org/latest/sdk/python/api/
Resources
Readme
License
Code of conduct
Code of conduct
Contributing
Contributing
Security policy
Security policy
Activity
Stars
0 stars
Watchers
0 watching
Forks
0 forks
Report repository
Releases
Packages
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Universal Dark Mode - works on any site\n(function() {\n var enabled = true;\n \n function applyDarkMode() {\n if (!enabled) return;\n \n // Create style element if it doesn't exist\n var style = document.getElementById('universal-dark-mode-style');\n if (!style) {\n style = document.createElement('style');\n style.id = 'universal-dark-mode-style';\n document.head.appendChild(style);\n }\n \n // Dark mode CSS - inverts colors but preserves images/video\n style.textContent = '\n /* Invert everything except media */\n html {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #1a1a2e !important;\n }\n \n /* Restore images, videos, iframes, canvas */\n img, video, iframe, canvas, svg, picture, [style*=\"background-image\"] {\n filter: invert(1) hue-rotate(180deg) !important;\n }\n \n /* Preserve specific elements that should not be inverted */\n .no-dark-mode, .no-dark-mode *,\n [data-theme=\"light\"], [data-theme=\"light\"],\n .ace_editor, .ace_editor *,\n .CodeMirror, .CodeMirror *,\n .monaco-editor, .monaco-editor *,\n .markdown-body pre, .markdown-body pre *,\n .highlight, .highlight *,\n pre code, pre code * {\n filter: none !important;\n }\n \n /* Fix common UI elements */\n .modal, .popup, .dropdown-menu, .tooltip, .popover {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #2d2d44 !important;\n border-color: #444 !important;\n }\n \n /* Scrollbars */\n ::-webkit-scrollbar { background: #1a1a2e !important; }\n ::-webkit-scrollbar-thumb { background: #444 !important; }\n ::-webkit-scrollbar-thumb:hover { background: #555 !important; }\n \n /* Selection */\n ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ';\n }\n \n function removeDarkMode() {\n var style = document.getElementById('universal-dark-mode-style');\n if (style) style.remove();\n }\n \n // Toggle with Alt+Shift+D\n document.addEventListener('keydown', function(e) {\n if (e.altKey && e.shiftKey && e.key === 'D') {\n e.preventDefault();\n enabled = !enabled;\n if (enabled) {\n applyDarkMode();\n console.log('[Universal Dark Mode] Enabled');\n } else {\n removeDarkMode();\n console.log('[Universal Dark Mode] Disabled');\n }\n }\n });\n \n // Apply on load\n applyDarkMode();\n \n // Re-apply on dynamic content\n var observer = new MutationObserver(function(mutations) {\n if (enabled && !document.getElementById('universal-dark-mode-style')) {\n applyDarkMode();\n }\n });\n observer.observe(document.head, { childList: true });\n \n console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');\n})();", "Universal Dark Mode");
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

Skip to content
BranchesTags
Repository files navigation
A2A Python SDK
LicensePyPI versionPyPI - Python VersionPyPI - DownloadsPython Unit Tests
Ask Code Wiki
A2A Logo

A Python library for running agentic applications as A2A Servers, following the Agent2Agent (A2A) Protocol.

Important
Upgrading the SDK from 0.3 to 1.0? See the v0.3 → v1.0 migration guide. For supported A2A spec versions, see Compatibility.
✨ Features
  • A2A Protocol Compliant: Build agentic applications that adhere to the Agent2Agent (A2A) Protocol.
  • Extensible: Easily add support for different communication protocols and database backends.
  • Asynchronous: Built on modern async Python for high performance.
  • Optional Integrations: Includes optional support for:

🧩 Compatibility
This SDK implements the A2A Protocol Specification 1.0, with compatibility mode for 0.3. See #742 for details on the compatibility scope.
Spec VersionTransportClientServer
1.0JSON-RPC✅✅
1.0HTTP+JSON/REST✅✅
1.0gRPC✅✅
0.3 (compat)JSON-RPC✅✅
0.3 (compat)HTTP+JSON/REST✅✅
0.3 (compat)gRPC✅✅
🚀 Getting Started
Prerequisites
  • Python 3.10+
  • uv (recommended) or pip
🔧 Installation
Install the core SDK and any desired extras using your preferred package manager.
Featureuv Commandpip Command
Core SDKuv add a2a-sdkpip install a2a-sdk
All Extrasuv add "a2a-sdk[all]"pip install "a2a-sdk[all]"
HTTP Serveruv add "a2a-sdk[http-server]"pip install "a2a-sdk[http-server]"
gRPC Supportuv add "a2a-sdk[grpc]"pip install "a2a-sdk[grpc]"
OpenTelemetry Tracinguv add "a2a-sdk[telemetry]"pip install "a2a-sdk[telemetry]"
Encryptionuv add "a2a-sdk[encryption]"pip install "a2a-sdk[encryption]"
Database Drivers
PostgreSQLuv add "a2a-sdk[postgresql]"pip install "a2a-sdk[postgresql]"
MySQLuv add "a2a-sdk[mysql]"pip install "a2a-sdk[mysql]"
SQLiteuv add "a2a-sdk[sqlite]"pip install "a2a-sdk[sqlite]"
All SQL Driversuv add "a2a-sdk[sql]"pip install "a2a-sdk[sql]"
Examples
Helloworld Example
  1. Run Remote Agent
    git clone https://github.com/a2aproject/a2a-samples.git
cd a2a-samples/samples/python/agents/helloworld
uv run .
  2. In another terminal, run the client
    cd a2a-samples/samples/python/agents/helloworld
uv run test_client.py
  3. You can validate your agent using the agent inspector. Follow the instructions at the a2a-inspector repo.
🌐 More Examples
You can find a variety of more detailed examples in the a2a-samples repository:
🤝 Contributing
Contributions are welcome! Please see the CONTRIBUTING.md file for guidelines on how to get involved.
📄 License
This project is licensed under the Apache 2.0 License. See the LICENSE file for more details.
About
Official Python SDK for the Agent2Agent (A2A) Protocol
a2a-protocol.org/latest/sdk/python/api/
Resources
Readme
License
Code of conduct
Code of conduct
Contributing
Contributing
Security policy
Security policy
Activity
Stars
0 stars
Watchers
0 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors
Languages