harness-sdk

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