TL;DR
Semble introduces a code search tool optimized for agents, reducing token usage by 98% compared to grep+read, with near-instant indexing and query speeds. It runs entirely on CPU, requiring no external services.
Semble, a new code search library tailored for AI agents, has been released, promising to deliver exact code snippets with approximately 98% fewer tokens than traditional grep+read methods.
Semble is built to enable agents like Claude, Codex, and others to perform rapid, precise code searches without external dependencies or GPU requirements. It indexes repositories in around 250 milliseconds and answers queries in approximately 1.5 milliseconds, all on CPU. Benchmarks indicate its retrieval quality is comparable to specialized transformer models, with an NDCG@10 score of 0.854. The system can be run as an MCP server or invoked via command line, supporting local paths and git URLs. It is designed to be token-efficient, returning only relevant code chunks, which results in substantial savings—up to 98% fewer tokens—compared to traditional grep and read workflows.
Why It Matters
This development matters because it significantly reduces the cost and latency of code searches for AI agents, enabling faster and more efficient development and debugging workflows. By eliminating the need for external services or GPUs, Semble offers a local, scalable solution that can be integrated into existing agent architectures, potentially improving productivity and lowering operational overhead.
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Background
Existing code search tools for AI agents often rely on large transformer models or external services, which can be costly and slow. Semble’s release addresses these limitations by providing a lightweight, CPU-only solution that maintains high retrieval accuracy. Its development builds on the need for more efficient code search in AI workflows, especially as codebases grow larger and more complex.
“Semble indexes an average repo in about 250 ms and answers queries in roughly 1.5 ms, all on CPU, with 98% fewer tokens than grep+read.”
— Semble development team
“Semble achieves an NDCG@10 of 0.854, comparable to specialized transformer models, at a fraction of the size and cost.”
— Benchmark researchers
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What Remains Unclear
It is not yet clear how Semble performs across very large or complex codebases, or how it compares in real-world debugging scenarios. Long-term stability and integration support are still to be tested in diverse environments.
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What’s Next
Next steps include broader adoption by AI development teams, integration into various agent frameworks, and further benchmarking in production settings. Updates may include enhancements to indexing speed, query accuracy, and support for additional code repositories.
CPU-based code indexing tools
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Key Questions
How does Semble achieve such a high speed and low token usage?
Semble uses optimized indexing and retrieval algorithms that focus on returning only the most relevant code snippets, drastically reducing token consumption and response time.
Can Semble be integrated with existing AI agents easily?
Yes, Semble supports integration via MCP servers or command-line interfaces, compatible with agents like Claude, Codex, and others, with straightforward setup instructions.
Does Semble require external hardware or cloud services?
No, it runs entirely on CPU without needing API keys, GPUs, or external services, making it suitable for local deployment.
What are the limitations or open questions about Semble?
Performance on very large codebases or in complex search scenarios remains to be fully evaluated. Long-term stability and support across diverse environments are still to be confirmed.
