Machine Learning Engineer • AI Infrastructure • Contributor
Active contributor to leading agentic AI frameworks — LangChain, LangGraph, and CrewAI. I focus on production reliability, lifecycle stability, schema validation, and traceable tool invocation in agent ecosystems.
My work addresses:
- Tool call parsing and structured output validation
- Pydantic v2 compatibility and schema hygiene
- Agent lifecycle stability in non-interactive and CI/CD environments
- Time-travel checkpointing and reproducibility
- Downstream embedding bugs and dependency validation
These efforts often involve complex code paths, legacy compatibility, and community-visible design tradeoffs. I target high-friction issues, write minimal reproducible tests, and coordinate with other contributors to land meaningful changes on actively evolving codebases.
My contributions across LangChain repos
| Repo | PR Title | Status | Link |
|---|---|---|---|
| langchain-ai/langchain | Fix single-quoted JSON tool calls | ✅ Merged | #32109 |
| langchain-ai/langchain | Structured output fix for Pydantic v2 | 🟡 Open | #32255 |
| langchain-ai/langchain-community | RequestsGetTool validation error | 🟡 Open | #211 |
| langchain-ai/langchain-community | InstructorEmbedding dependency error | 🟡 Open | #209 |
| langchain-ai/langchain-community | SQLDatabaseTool response_format support | 🟡 Open | #215 |
| langchain-ai/langgraph | Checkpoint ID on time travel | 🟡 Open | #5591 |
| langchain-ai/langgraph | Remove deprecated dynamic versioning | 🟡 Open | #5599 |
| langchain-ai/langgraph | Concrete validation types for StateLike | ❌ Closed | #5596 |
| crewAIInc/crewAI-tools | Fix agent crash in non-interactive shell | 🟡 Open | #390 |
| crewAIInc/crewAI | Prevent Pydantic coercion of state model | 🟡 Open | #3218 |
| Repo | Issue | Contribution | Status |
|---|---|---|---|
langchain-ai/langchain |
#31335 | Diagnosed an upstream bug in the model's chat template as the root cause. My analysis led to the issue's closure. | ✅ Closed |
langchain-ai/langgraph |
#5165 | Provided a minimal reproducible example (MRE) which confirmed the bug and helped lead to its closure. | ✅ Closed |
langchain-ai/langgraph |
#2538 | Provided an MRE that confirmed the bug report, leading to its closure. | ✅ Closed |
- Agentic architectures: LangGraph, CrewAI
- RAG pipelines and reranking logic
- Schema-first LLM integration and validation
- Reproducibility, observability, and automated testing
- GitHub: github.com/diego-coder