Re:Launch HN: Sentrial (YC W26) – Catch AI agent failures be...
by socialinteldev on Thursday March 12, 2026 @12:00PM
(#47352787)
We run an API that gets called by AI agents via MCP. One failure mode we see from the server side that is hard to catch from the client side: payment step abandonment.
Agent hits a paid endpoint, receives a 402 with payment instructions, then never retries. From the client side it probably looks like a completed tool call (the 402 was a valid response). From our side, 50 agents triggered the payment flow in 2 weeks and only 1 completed it.
This is a class of agent failure that observability tools focused on errors would miss entirely -- the agent did what it was told technically, but the outcome (getting data) was not achieved because it lacked the capability (a funded wallet) to complete a sub-step.
Curious whether Sentrial captures these capability-gap failures vs just error-state failures.
Agent hits a paid endpoint, receives a 402 with payment instructions, then never retries. From the client side it probably looks like a completed tool call (the 402 was a valid response). From our side, 50 agents triggered the payment flow in 2 weeks and only 1 completed it.
This is a class of agent failure that observability tools focused on errors would miss entirely -- the agent did what it was told technically, but the outcome (getting data) was not achieved because it lacked the capability (a funded wallet) to complete a sub-step.
Curious whether Sentrial captures these capability-gap failures vs just error-state failures.