Statem

Statem

Use statem when the task is long-running, iterative, easy to lose track of, or benefits from explicit agent state. Prefer it as a runbook, not as a rigid harness.

Workflow

1. Find or create a statem spec such as statem.yaml.
2. Validate it: python3 -m statem validate statem.yaml --json.
3. Start or resume a run: python3 -m statem start statem.yaml --run-id <id> --json.
4. Check state before acting: python3 -m statem cur --run-id <id> --json.
5. Move only through allowed edges: python3 -m statem goto <node> --run-id <id> --json.
6. Save progress before pausing: python3 -m statem save --run-id <id> --json.
7. For handoff context, read recent history: python3 -m statem history --run-id <id> --tail 10 --json.

Use statem instead of python3 -m statem if the CLI is installed on PATH.

For dynamic servers, company machines, or disposable git checkouts, prefer a machine-local state directory. Set STATEM_STATE_DIR once, for example $HOME/.local/state/statem/<project>, so runtime state survives checkout replacement. After moving to a new checkout, run statem start <spec> --run-id <id> once to rebind the run to the current spec path.

Commit YAML runbooks with the repo. Do not commit runtime state; treat .statem/ or STATEM_STATE_DIR as local, copy-on-use execution data.

Context Clear

Avoid /clear in normal loops. It flushes the conversation, including any instructions that were supposed to run after it, and can lose useful intent that was not written to durable files. Prefer explicit transitions plus safe compaction.

Before a hard clear, generate a durable resume prompt:

python3 -m statem prompt --run-id <id>

Paste the generated prompt immediately after /clear. The agent must recover from .statem with start, cur, and history; it should not rely on any pre-clear conversation.

Loop Compaction

For cyclic runbooks, prefer an explicit session hygiene node after a full loop. When continuing another cycle and context is noisy, generate a safe compaction instruction:

python3 -m statem compact-prompt --run-id <id>

Run the generated /compact instruction through the host UI, then recover with statem cur and statem history --tail 10. Do not use hidden self-messaging to trigger compaction.

Agents may inspect the full graph with statem state; cur, next, and goto are for disciplined execution and attention anchoring, not for hiding the runbook.

Auto Loop Hook

When the host supports a Stop hook, users may opt into auto-loop behavior with integrations/hooks/statem_stop_hook.py. The hook runs when the agent is about to hand control back to the user. If a statem run is active, the current node is not a terminal/handoff node, and there are outgoing transitions, it returns a continuation prompt that tells the agent to inspect statem cur and keep working from the current node.

Registration examples live in:

• examples/hooks/README.md
• examples/hooks/codex-stop-autoloop.hooks.json
• examples/hooks/claude-stop-autoloop.settings.json

Merge the matching snippet into the host hook configuration and use an absolute script path if the hook is registered outside the statem repository.

Treat this as host-level glue. It must not advance state, run /clear, or hide the graph. The agent should still transition only with statem goto.

Authoring Specs

• Keep the static spec separate from .statem/ runtime state.
• Use natural-language checks for low-friction runbooks.
• Use in_hook for setup after entering a node.
• Use before_transfer for redo/check loops while still in the current node. It is a spec field, not a CLI command; statem goto runs it automatically.
• Use out_hook to persist current-node progress before leaving.
• Use edge hook as prepare-transfer work after out_hook and before entering the target. If a blocking edge hook fails, the pointer stays at the source so the agent can retry.
• Use type: command for deterministic shell checks.
• Use type: predicate for file existence, non-empty files, text matches, and JSON-path checks.
• Use type: llm_review when another model, agent, or script should review before a transition.

Do not manually edit .statem/runs/<run-id>/state.json unless the user explicitly asks for runtime surgery.