Every dashboard stays green. A customer finds out first.
Technical failures that never throw
Loops, hidden retries and swallowed errors. Truncated, refused or empty responses. Latency, cost and tool failures creeping up after a change. The run completes, so nothing alerts.
Functional failures that look normal
An answer the sources don’t support. A rule from your system prompt broken. “I’ve issued the refund” with no refund call. A figure that doesn’t match the record.
The same failure, again
You patched it last week. It is back in a slightly different shape, and nothing stopped it.
Illustrative. Every run finishes without an error. Zespan checks what actually happened.
Your agent is a stack. Zespan is wired into every stage.
Prompt, agent, LLM, retrieval, MCP and tools all have to work for a run to land. Zespan integrates with each one, so when a stage fails silently, you know which one, and why.
See the finding Zespan writes.
Pick a failure: what happened, the cause, the layer it came from, the fix and the prevention.
Technical
How the agent ran
Functional
What the agent said and did
From first failure to permanent fix.
Detect
See the failures your monitoring misses.
Forty failures with one cause arrive as one issue, posted to Slack or PagerDuty with the trace attached.
You hear about a failure from Zespan, not from a customer.
Fix
Test the fix before anyone approves it.
Zespan drafts the change and replays it against every failure it should solve, so you see the pass rate first.
Nothing ships until a named person approves it.
Prevent
Then make sure it can’t come back.
Replay a guardrail on last month’s traffic to see what it would have caught and wrongly blocked, then enforce it in-process, with no proxy hop.
Every fixed failure becomes a regression test.
Other tools show you what happened. Zespan tells you what went wrong.
Categories describe what each kind of tool typically does. Individual products vary.
What Zespan catches in your domain.
General checks run on every agent. Domain checks know what a wrong answer looks like in your industry.
Any agent in production
Silent failures in any agent, technical or functional.
Retry storms
Silent step failures
Tool errors ignored
“I did X” with no matching call
Wrong-customer data
Secrets or personal data in answers or outbound tools
Untrusted text driving a write
Destructive action with no approval
Truncated, blocked or empty answers
Cost, latency and tool-failure rises
Tested on real production traffic.
A pilot ran 10 agents in production through Zespan. Here is what it found.
104
silent failures caught, none of them raised an error
10
real issues, grouped with a cause each
2
turned into permanent tests, so they can’t come back
Enterprise
Run agents in production with controls your auditors accept.
For security, risk and compliance teams. Zespan runs in your environment, keeps a record of every agent action and tool call, holds risky actions for a named reviewer, and exports the evidence.
Self-hosted
Runs in your VPC. Data never leaves your environment.
SSO
SAML or OIDC with your identity provider.
Approval flows
Risky tool calls wait for a named person.
Audit trail
Every agent action and tool call, with who approved it.
SOC 2 evidence pack
Control evidence, ready to export.
BYOK and redaction
Your keys. Personal data removed before any model.
