> ## Documentation Index
> Fetch the complete documentation index at: https://docs.trynexus.io/llms.txt
> Use this file to discover all available pages before exploring further.

# Production checklist — Nexus

> Harden Nexus tracing before shipping

Use this checklist before enabling tracing in production systems.

## Runtime safety

* ensure `api_key` values are valid UUID strings
* keep payload size bounded before logging `input` and `output`
* avoid logging raw secrets, tokens, or PII
* apply timeout and retry strategy to any external trigger endpoint

## Data layer

* provision `agent_logs` with indexes for `user_id`, `trace_id`, and `parent_run_id`
* configure DB connection limits for your request volume
* monitor write failures from psycopg connection attempts
* set retention policies for trace data

## LangChain behavior

* keep `dev_mode=True` outside production if trigger calls are not desired
* document callback attachment points in your app architecture
* verify root chain events are consistently produced in your chains

## Observability

* alert on sustained insert failures
* sample event volumes per trace
* track average and p95 trace depth
* define dashboards for error-heavy event categories