Capstead: A Governance Layer for Spring Boot AI Capabilities
VisibleEfficiency249 · reddit · 2026-07-16
Capstead 0.5.3 is an open-source solution for Spring Boot that elevates AI calls from scattered LLM requests into governable, versionable capabilities.
Key features include:
- Declaring methods as capabilities via annotations or config, logging every execution through AOP
- Tracking models, tokens, costs, and parent-child call trees to map out the capability chain
- Binding owner, domain, version, and daily budgets to each capability, with blocking on overages
- Exposing endpoints via Actuator, alongside dashboard and Micrometer/Prometheus metrics
The author also shares several engineering insights:
- Provider-neutral design is crucial: Spring AI, LangChain4j, and native SDKs are all supported.
- Declarative capabilities reduce boilerplate, but metadata must be registered separately.
- Cross-instance persistent logging is essential for multi-replica deployments; otherwise, scorecards are only valid on a single machine.
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