Zambo, the verifiable work layer for AI
AI audit trail: show anyone what your AI actually did
An AI audit trail is a record of tool calls written by the system that executed them, separate from the agent's own log. A reviewer outside your team can open the public receipts without an account. Zambo is the verifiable work layer for AI: gather the job into one handover link, then ask the client to review and respond.
Why an agent's own story is not independent evidence
An agent-written summary can omit failed calls or work that was never recorded. Check the execution system's record and the receipt's provenance claim instead. Calls outside Zambo are not automatically included. Agent-reported entries remain reports, not independently observed executions.
What a checkable trail contains
Keep each call's public receipt link, its observed result and saved time, and its saved-byte check. Follow the records in order and keep failures, unavailable evidence, and unchecked work visible.
Give the client one link, not a transcript
bd7e5325-33fd-4c5e-b029-76b781fa2f51 is an open public handover with five steps. Its work-level not checked list names aa725980 and 75253fbc. Those are work gaps, not failed saved-byte checks. The public page shows steps, verifiable receipts, and what the record proves and does not prove. Its public view is read-only.
For a chain, pick up the preceding handover with handover_accept and use continue_from in the same job session. For recurring work, handover_series creates a living handover link. A client decides Accept or Flag through their separate client link. Public example pages cannot record your decision.
After a decision, the holder of the private client link can download the approval record PDF at /handover/<id>/approval.pdf. The public example does not give you that capability. Approval PDF and JSON are free after a decision; sealing, including producing the dispute pack, requires a pass.
How a reviewer checks the saved record
Open the receipt link and check the receipt. A matching digest means the saved record was not changed since it was saved. It is not a judgment about whether the answer was right. Run the read-only demo to inspect a first receipt.
What this record proves, and what it does not
A receipt proves the saved result was not changed since it was saved. It never proves the answer was right and never proves an external event happened.
A handover does not establish who produced the work. AI labels and reviewer details are reported claims, not verified identities. Spot-check important outside outcomes separately.
Access and the receipt format
The free tier varies by tool, with tool-specific free daily allowances. Check the current tool description before planning a batch. A Day Pass is $0.99 for 24 hours. Zambo Pass costs $29 for 30 days, one payment, or $290 for 365 days, one payment. Eligible $ZAMBO holders can purchase 30 days for the holder rate. No subscription. No automatic renewal. Public handover pages, browser verification, and Accept or Flag are free. Sealing a handover, including producing its dispute pack, requires a pass.
Read the AER-1 reference and AER-1, IETF Internet-Draft draft-zambo-aer1-26 for the receipt format. It is a draft, not a finished standard.
Questions and answers
What is an AI agent audit trail?
It is an ordered record of tool calls with public receipts a reviewer can inspect. The saved-byte check establishes that the saved record was not changed since it was saved, not that the work was correct.
Is the agent's own log an independent audit trail?
No. An agent-authored log is its own account of events. Inspect records from the execution system and distinguish directly executed work from externally observed work and agent-reported claims.
How do I check what my AI agent did?
Open the tool receipts, check their provenance and observed results, then use https://zambo.dev/verify/ to check their saved bytes. Spot-check important outside outcomes separately.
Can I give the AI audit trail to a client?
Yes. A handover collects recorded steps on one link. Send the separate client link to let the reviewer Accept or Flag. Public examples are read-only.
What does the trail prove and not prove?
A receipt proves the saved result was not changed since it was saved. It never proves the answer was right and never proves an external event happened.
What does an AI audit trail cost?
The free tier varies by tool, with tool-specific free daily allowances. Check the current tool description before planning a batch. A Day Pass is $0.99 for 24 hours. Zambo Pass costs $29 for 30 days, one payment, or $290 for 365 days, one payment. Eligible $ZAMBO holders can purchase 30 days for the holder rate. No subscription. No automatic renewal. Public handover pages, browser verification, and Accept or Flag are free. Sealing a handover, including producing its dispute pack, requires a pass.
Who authored the AER-1 draft?
Brennan Zambo authored AER-1, the AI Agent Execution Receipt IETF Internet-Draft. The current revision is draft-zambo-aer1-26, available at https://datatracker.ietf.org/doc/draft-zambo-aer1/26/.
Add Zambo to your AI
Connect the free MCP at https://zambo.dev/mcp in Claude, ChatGPT, Gemini, Cursor, Grok, Windsurf, or VS Code. No key is needed. The first receipt arrives with the first call through Zambo. Adding a URL does not automatically install a connector; use your client's MCP settings.
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