AppendOnly Presents an Immutable Work Record for AI Agents

Summary

AppendOnly, a project from 5R Industries, describes a record system intended to preserve evidence of what an AI agent actually did even as models or vendors change. The system runs on the customer’s own machines and records tool calls through a hook when each call returns; the agent cannot edit those rows afterward. A separate model, controlled by neither the agent nor its vendor, checks claims about completed work against the record, while an observer can flag unsupported claims. Entries are linked by fingerprints, and the company says commits since 9 September 2026 are signed, with the record’s head sent to a public timestamp service each morning and checked by the observer every minute. The site gives an illustrative case in which an agent claimed that work was complete after three of four tests had run; the verifier agreed with the recorded rows, the observer flagged the missing test, and a later agent completed it. The example is presented as the shape of the system’s output, not as an independently reported incident. In a company pilot running since March 2026, 5R Industries says one AI chief of staff cost about $829.12 over 55 days, or roughly $15 per day at list price. The pilot recorded 557 verifications, 43 dated incidents, about 98% of context served from cache, $1.98 per commit, and $1.04 for a fresh instance to orient from the record alone. The company says the record, verifier, and checks remain on customer hardware, while model-vendor traffic, timestamp fingerprints, and operator pager messages leave that environment. It claims replacement instances can resume in minutes and that the design is intended to survive model or vendor changes, although that scenario has not yet been measured. AppendOnly is positioned for an eight-week pilot involving one workflow and the customer’s machines, particularly for organizations that must answer for agent actions, including contractors, system integrators, transportation, financial services, pharmaceutical, healthcare, legal, and insurance organizations. The accompanying report and evidence bundle are deposited at Zenodo, and the site says the published hash and signing records verify document origin and integrity, not the truth of the report’s contents.