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sdk-python

MCP Developer Tools

A model‑driven SDK for quickly building and running AI agents with flexible tooling, multi‑agent support, and built‑in MCP server integration.

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Python Latest python-wasm/v0.0.1 · 1d ago Security brief →

Features

  • Lightweight & fully customizable agent loop
  • Model‑agnostic: supports Amazon Bedrock, Anthropic, Gemini, Ollama, OpenAI, and custom providers
  • Advanced capabilities including multi‑agent systems, autonomous agents, and streaming support
  • Built‑in Model Context Protocol (MCP) server integration for thousands of pre‑built tools

Recent releases

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python/v1.42.0 Mixed
Auth RBAC

Fixes, monorepo, Gemini, strands-py-wasm, A2A, MCP

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No immediate action
v1.41.0 New feature

MultiAgentPlugin + Starlette 1.x + TTL support

Open
No immediate action
v1.40.0 Bug fix

Default token count flag

Open
v1.39.0 New feature
Notable features
  • Enable OpenAI provider to use AWS profile
  • Add context window limit lookup table
  • Implement full A2A task lifecycle state support
Full changelog

What's Changed

  • feat: enable openai provider use aws profile by @JackYPCOnline in https://github.com/strands-agents/sdk-python/pull/2230
  • fix: include root cause in MCPClientInitializationError message by @aidandaly24 in https://github.com/strands-agents/sdk-python/pull/2238
  • feat: add context window limit lookup table by @opieter-aws in https://github.com/strands-agents/sdk-python/pull/2249
  • fix: fix count tokens for bedrock models by @mehtarac in https://github.com/strands-agents/sdk-python/pull/2254
  • fix: cache unsupported models for bedrocks token counting by @opieter-aws in https://github.com/strands-agents/sdk-python/pull/2250
  • feat: add useNativeTokenCount flag to skip token counting API calls by @opieter-aws in https://github.com/strands-agents/sdk-python/pull/2255
  • fix: correct MCPClient.exit and stop() type annotations by @cogwirrel in https://github.com/strands-agents/sdk-python/pull/2248
  • feat(a2a): implement full A2A task lifecycle state support by @agent-of-mkmeral in https://github.com/strands-agents/sdk-python/pull/2245
  • fix: integration test updates by @mehtarac in https://github.com/strands-agents/sdk-python/pull/2262

New Contributors

  • @aidandaly24 made their first contribution in https://github.com/strands-agents/sdk-python/pull/2238
  • @cogwirrel made their first contribution in https://github.com/strands-agents/sdk-python/pull/2248

Full Changelog: https://github.com/strands-agents/sdk-python/compare/v1.38.0...v1.39.0

View release on GitHub
v1.38.0 New feature
Notable features
  • Add TTL support to CachePoint for prompt caching
  • Large tool result offload implementation
  • Override count_tokens with native token counting for supported providers
Full changelog

What's Changed

  • feat(mcp): preserve CallToolResult.isError flag in MCPToolResult by @Zelys-DFKH in https://github.com/strands-agents/sdk-python/pull/2118
  • feat: add count_token method to model with naive estimation using tiktoken by @lizradway in https://github.com/strands-agents/sdk-python/pull/2031
  • chore(log): added warning for default model awareness and is subject to change by @poshinchen in https://github.com/strands-agents/sdk-python/pull/2164
  • fix(litellm): forward ttl field from CachePoint in _format_system_messages by @ElliottJW in https://github.com/strands-agents/sdk-python/pull/2153
  • fix(skills): preserve cache points in system prompt during skills inj… by @mattdai01 in https://github.com/strands-agents/sdk-python/pull/2134
  • fix(ollama): generate unique toolUseId instead of reusing tool name by @Ratansairohith in https://github.com/strands-agents/sdk-python/pull/2053
  • feat(cache): add TTL support to CachePoint for prompt caching by @kpx-dev in https://github.com/strands-agents/sdk-python/pull/1660
  • fix: use non-interactive flag for Nova Sonic history and system promp… by @prettyprettyprettygood in https://github.com/strands-agents/sdk-python/pull/2188
  • ci: update litellm requirement from <=1.82.6,>=1.75.9 to >=1.75.9,<=1.83.13 by @dependabot[bot] in https://github.com/strands-agents/sdk-python/pull/2197
  • ci: update pre-commit requirement from <4.6.0,>=3.2.0 to >=3.2.0,<4.7.0 by @dependabot[bot] in https://github.com/strands-agents/sdk-python/pull/2185
  • feat: large tool result offload by @lizradway in https://github.com/strands-agents/sdk-python/pull/2162
  • feat: override count_tokens with native token counting for supported providers by @opieter-aws in https://github.com/strands-agents/sdk-python/pull/2189
  • fix(bedrock): upgrade default model to Claude Sonnet 4.5 by @afarntrog in https://github.com/strands-agents/sdk-python/pull/2193
  • chore: update style guide for tool spec navigation by @lizradway in https://github.com/strands-agents/sdk-python/pull/2203
  • feat: add ProviderTokenCountError for native token counting failures by @opieter-aws in https://github.com/strands-agents/sdk-python/pull/2211
  • fix(conversation-manager): handle window_size=0 and reject negative values by @SuperMarioYL in https://github.com/strands-agents/sdk-python/pull/2208
  • fix: change token counting fallback log from warning to debug by @opieter-aws in https://github.com/strands-agents/sdk-python/pull/2220
  • fix: do not synthesize exception for cancelled tools by @Gastly in https://github.com/strands-agents/sdk-python/pull/2106
  • feat: estimate input tokens before model calls by @opieter-aws in https://github.com/strands-agents/sdk-python/pull/2221
  • feat(offloader): return explicit paths in preview and auto-enable retrieval by @lizradway in https://github.com/strands-agents/sdk-python/pull/2222
  • fix: update tests to use non-EOL'd model by @zastrowm in https://github.com/strands-agents/sdk-python/pull/2226
  • feat(bedrock): add strict_tools config with auto-inject of additional… by @kaghatim in https://github.com/strands-agents/sdk-python/pull/2213

New Contributors

  • @Zelys-DFKH made their first contribution in https://github.com/strands-agents/sdk-python/pull/2118
  • @ElliottJW made their first contribution in https://github.com/strands-agents/sdk-python/pull/2153
  • @Ratansairohith made their first contribution in https://github.com/strands-agents/sdk-python/pull/2053
  • @kpx-dev made their first contribution in https://github.com/strands-agents/sdk-python/pull/1660
  • @prettyprettyprettygood made their first contribution in https://github.com/strands-agents/sdk-python/pull/2188
  • @SuperMarioYL made their first contribution in https://github.com/strands-agents/sdk-python/pull/2208
  • @Gastly made their first contribution in https://github.com/strands-agents/sdk-python/pull/2106
  • @kaghatim made their first contribution in https://github.com/strands-agents/sdk-python/pull/2213

Full Changelog: https://github.com/strands-agents/sdk-python/compare/v1.37.0...v1.38.0

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