Jev in production › Agent tool and action selection

Reflex (Datadog Labs)

Recommends operational actions like circuit breaking or autoscaling on Datadog metrics using Jev, executed only if separate guards pass, in this Rust control-loop SDK (Datadog Labs).

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The source publishes no measured number.
Use
Agent tool and action selection
Industry
IT operations
Form
Open-source tool
Stage
In production
Plugs into
Datadog
Listed
2026-09-25
Found via
github
Repository
datadog-labs/reflex
Stars
31
Forks
1
Last push
2026-10-07
Language
Rust
License
Apache-2.0
Reflex (Datadog Labs) screenshot
docs/images/circuit-breaker-simulator.gif in the datadog-labs/reflex README, Apache-2.0; shown from GitHub.

The README opens with

Reflex is a Rust library for control loops that act on observability data. Metrics queried from Datadog and forecasts from Toto become typed state. A model, such as TypeSafe AI's Jev, recommends an action, and Reflex commits it only if it passes the guards and invariants you declared.

Reflex fits control loops where the right action depends on changing conditions, but execution must obey fixed constraints.

- Circuit breaking. Open, probe, or close based on service health, while enforcing cooldowns and probe limits. - Scheduling. Choose which request gets capacity next, while enforcing resource limits. - Autoscaling. Add or remove capacity based on demand and forecasts, while enforcing capacity bounds. - Retries. Decide whether to retry a failed...

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For the project's own README, linking back here:

Listed in Jev in production

Also used for agent tool and action selection