Mistral Vibe: Experimental Harness Gets Todo Tracking and a Persistent Scratchpad
Mistral VibeMistral Vibe's --experimental-harness sessions gained todo tracking, shown as a pinned line under the input and viewable in full with the /todo command, plus a per-session scratchpad that keeps notes and re-states them to the agent after the conversation is summarized. The same release also brought /teleport support to --experimental-harness sessions, closing a feature gap against the standard harness.
Key Takeaways
--experimental-harnesssessions now track todos as a pinned line under the input, expandable with/todo.- A new per-session scratchpad preserves an agent's working notes and re-states them after the conversation is summarized.
/teleportnow works under--experimental-harness, closing a feature gap with the standard harness.- These features target long-running, multi-step agent sessions where losing track of progress or notes is a real risk.
--experimental-harnessremains distinct from the separately-stabilized "Unified Harness" in the same release, so this is still an opt-in, early-access surface.- No independent third-party coverage exists yet for this specific feature.
Todo Tracking and a Scratchpad for the Experimental Harness
Mistral Vibe's v2.25.5 release added two working-memory tools to sessions started with the --experimental-harness flag: a todo list and a persistent scratchpad.
A Pinned Todo Line and Full /todo View
According to the CHANGELOG.md, these sessions "can track todos, shown as a pinned line under the input and in full on /todo." That gives a developer a constant, at-a-glance summary of what the agent still has left to do, with the option to expand into the complete list whenever needed, rather than having to scroll back through the conversation to reconstruct a plan.
A Scratchpad That Survives Summarization
The same sessions now also "keep a per-session scratchpad whose notes are re-stated to the agent after the conversation is summarised." Long-running agent sessions periodically get compacted or summarized to manage context, and that process can otherwise lose fine-grained working notes. By re-stating the scratchpad's contents after a summarization pass, Mistral Vibe prevents the agent from losing track of details it had jotted down for itself earlier in the session.
Teleport Parity
The same release also added /teleport support under --experimental-harness, meaning a feature that was previously only available on the standard harness now works for developers testing the experimental one too.
Why It Matters
--experimental-harness is distinct from the "Unified Harness" that graduated out of experimental status in this same release, so this is still an opt-in surface for developers who want to try upcoming capabilities early. Todo tracking and a durable scratchpad are exactly the kind of working-memory features that make long, multi-step agent sessions easier to follow and trust.