OpenClaw Session Tools Explained

Session tools are where OpenClaw graduates from “chat with one agent” to “operate a session tree on purpose.” They let the agent inspect other visible sessions, read bounded history, send cross-session messages, spawn sub-agents, and control children without pretending every piece of work belongs in the current chat window.

What it is

The docs describe this family as tools for working across sessions, checking status, and orchestrating sub-agents. The available set includes sessions_list, sessions_history, sessions_send, sessions_spawn, sessions_yield, subagents, and session_status. That lineup is practical because it covers the full operating loop: discover a session, inspect it safely, talk to it, start a new child when necessary, and then wait for results without getting trapped in poll loops.

The important thing to understand is that OpenClaw usually separates the human-facing idea from the underlying storage and runtime machinery. Once you know where the state lives, how the gateway applies it, and which tool or config surface controls it, the feature stops feeling magical and starts feeling dependable.

How it works in practice

A lot of the value is in the safety constraints. sessions_history returns a sanitized, bounded view rather than a raw transcript dump. Visibility is scoped by levels such as self, tree, agent, or all, with sandboxed sessions clamped to tree. sessions_spawn is explicitly non-blocking and returns the runId and childSessionKey immediately. sessions_yield exists purely so you can stop the current turn and let the completion event arrive naturally instead of building brittle status churn.

sessions_list
sessions_history
sessions_send
sessions_spawn
sessions_yield
subagents
session_status

• Use sessions_history when you need bounded recall of another session, not a raw dump.
• Use sessions_spawn to create isolated work instead of stuffing everything into the current session.
• Use sessions_yield when the next useful thing is a completion event, not another local paragraph.
• Use subagents as the control plane for already spawned child sessions.

Operator guidance

Operationally, session tools work best when you respect their shape. List or inspect on demand, then act. Spawn when work should be isolated. Yield when you are waiting. The docs are especially good on this point because they keep nudging operators away from hand-built polling habits. That is not just elegance. It reduces noise, token waste, and race conditions where the parent keeps talking while the child is still producing the result that actually matters.

The main mistake is treating session tools like unrestricted omniscience. They are intentionally scoped. Another mistake is forgetting that leaf sub-agents do not recursively get the whole orchestration suite by default. OpenClaw wants deeper orchestration to be deliberate. That is a good safety posture because session control is powerful and easy to abuse if every tiny leaf run can poke at everything else.

Once you use session tools the way the docs intend, multi-step orchestration gets cleaner fast. If you want the practical operator layer on top of the official docs, The OpenClaw Playbook turns setups like this into real workflows, guardrails, and day-to-day patterns you can actually run.

I also think session_status is underrated. A lightweight status card for the current or another visible session is exactly the kind of boring helper that keeps operators from turning every simple check into a bigger and more expensive interaction.

The visibility model is another quiet safety feature. self, tree, agent, and all give you explicit bounds on what a session can inspect, with tree as the default and sandboxed sessions clamped there regardless of broader config.

For orchestration, the two tools I would memorize are sessions_spawn and sessions_yield. Spawn starts detached work, and yield ends the current turn so the completion can come back as the next event without teaching the agent to poll in circles.