AI Coding Tool Indemnity Terms Change: Which Terms Govern Code Generated Earlier

Why a terms change creates a version problem

Teams that adopted an AI coding assistant early often have code in production that was generated under an earlier version of the vendor's terms. When the vendor later revises its indemnity language, whether the coverage scope, the conditions, the exclusions or the required settings, three separate questions appear. Which version applied when the code was generated? Does the later version reach back to earlier output? And does any obligation under the earlier version continue after the relationship ends?

The answers can differ for different code. A repository built over eighteen months may contain output generated under several versions of the terms and several tool configurations. Treating the whole codebase as covered by one set of terms, or by none, is an assumption that a claim would have to survive. Procurement's practical task is to find out what the contract says and to make sure the evidence exists to apply it.

The contract mechanics that decide which terms apply

Effective date is the starting point. An amendment ordinarily takes effect on a stated date, and the contract may say whether it applies only to use after that date or also to output created earlier. If the text is silent, that gap is a matter for counsel, not an assumption for procurement to settle.

Notice and acceptance determine whether the amendment bound you at all. As an illustration of one mechanism, the federal commercial products and services clause states that changes in the terms and conditions of the contract may be made only by written agreement of the parties (as of November 2026). A NIST commercial solicitation carries the same language and names the Contracting Officer as the only person authorized to approve changes. These are U.S. government contracts and do not describe how private vendor terms operate. Vendor terms may allow amendment by notice, by continued use or by signed amendment, and an enterprise agreement may differ from the standard online terms. You need to know which route applies and how each amendment reached you.

Survival clauses address what remains after termination or non-renewal. If indemnity for code generated during the term continues afterward, the record matters more, because the claim may arise long after the tool is retired. If it does not, the position of older code is weaker than teams often assume.

Conditions on the indemnity make configuration part of the claim

Indemnity language for AI code generation may depend on conditions such as enabled filters, required settings or usage restrictions. If so, the question is not only which version of the terms governed, but whether the conditions of that version were met when the code was generated. A setting that was required in one version and absent from another, or one that was available but switched off for some users, changes the position for specific code.

NIST's Generative AI Profile cautions that non-standard vendor terms can amplify or defer liability in unexpected ways, and suggests a clear assignment of liability and responsibility for incidents. It also notes that generative AI systems change over time through fine-tuning, drift and decay. For a buyer, this means the tool and model version in use at generation is relevant context, and that configuration should be recorded as it was, not as it is today.

The evidence needed to tie code to the terms

NIST advises keeping detailed content-provenance records covering sources, timestamps, metadata and changes made by third parties, and recommends version control to track change over time. Applied to AI-generated code, a claim record would typically need six elements: the generation timestamp, the tool and its version, the configuration and filters active at that moment, the account or team that used it, the origin and licence context of the output, and any later modification by people or other tools.

One element sits outside the code itself. Capture a dated copy of the vendor terms, and of each amendment, when a tool is adopted or renewed, together with a note of how each amendment was accepted and by whom. Without that, a generation timestamp cannot be matched to a terms version with confidence. This is practitioner discipline rather than a stated requirement, but it is inexpensive at the time and difficult to reconstruct afterward.

Vendor-held records are a second source. Ask what the vendor retains and whether you can export it. Records that exist only on the vendor side may not be available when a dispute arises, particularly after termination.

Where code provenance and enforcement evidence fit

Trussed enforces policy in the execution path of coding assistants, with actions that include allow, redact, block, rate limit and escalate for human approval, applied to individual interactions and tool calls. Enforced at runtime, not reviewed after the fact, this produces audit-ready evidence as a by-product of enforcement. Trussed also provides code provenance: the origin, licence and security context of code. Deployment is self-managed in the customer cloud, with configurable retention and data residency, so the retention period can be set to match how long a claim could realistically arise.

This covers the code-side record. It does not replace the contract-side work: holding dated copies of each terms version, recording how amendments were accepted, and obtaining legal interpretation of retroactivity and survival. A claim needs both halves, and procurement owns the second.