CrewAI 1.14.3 adds checkpoint support and cuts cold start by ~29%

CrewAI `1.14.3`, authored by greysonlalonde and contributed to by ten collaborators, delivers a broad set of features centered on checkpoint reliability and expanded sandbox support. Lifecycle events for checkpoint operations are now available, and standalone agents gain checkpoint and fork support. New sandbox integrations include e2b and Daytona tools, while infrastructure integrations add Bedrock V4 and an Azure `DefaultAzureCredential` fallback for cases where no API key is supplied.

On the performance side, an optimization to the MCP SDK and event types cuts cold start by ~29%.

The release addresses a significant number of serialization and state-management bugs: `execution_id` is now separate from `state.id`, initial state class references serialize correctly as JSON schema, Task class-reference fields are fixed for checkpointing, and metadata-only agent skills are preserved. Additional fixes resolve replay of recorded method events on checkpoint resume, propagation of implicit `@CrewBase` names to crew events, merging of execution metadata on duplicate batch initialization, `BaseModel` results in the guardrail retry loop, `thought_signature` preservation in Gemini streaming tool calls, and `task_started` emission on fork resume. The checkpoint TUI was also redesigned.

On the performance side, an optimization to the MCP SDK and event types cuts cold start by ~29%. Security is addressed via dependency bumps: `lxml` to `>=6.1.0` and `python-dotenv` to `>=1.2.2`. Checkpoint helpers were refactored to eliminate duplication and tighten state type hints, and documentation adds a new 'Build with AI' page across all supported languages.

Key facts

1. 01CrewAI version `1.14.3` released on 2026-04-24
2. 02Checkpoint and fork support added to standalone agents, with lifecycle events for checkpoint operations
3. 03New integrations: e2b, Daytona sandbox tools, Bedrock V4, and Azure `DefaultAzureCredential` fallback
4. 04MCP SDK and event type optimization reduces cold start by ~29%
5. 05Security patches: `lxml` bumped to `>=6.1.0` and `python-dotenv` to `>=1.2.2`
6. 06Multiple serialization and state-management bug fixes for checkpointing, Gemini streaming, and guardrail retry loop
7. 07Checkpoint helpers refactored to eliminate duplication and tighten state type hints

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