AbstractRuntime 0.2.0

AbstractRuntime: a durable graph runner designed to pair with AbstractCore.

AbstractRuntime

AbstractRuntime is a low-level durable workflow runtime:

• Execute workflow graphs (state machines)
• Interrupt → checkpoint → resume (hours/days) without keeping Python stacks alive
• Append-only ledger ("journal d’exécution") for audit/debug/provenance

Status: MVP kernel + file persistence + AbstractCore integration adapters are implemented.

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Key concepts

• WorkflowSpec: graph definition (node handlers keyed by id)
• RunState: durable state (current_node, vars, waiting, etc.)
• Effect: a side-effect request (llm_call, tool_calls, ask_user, wait_event, ...)
• Ledger: append-only step records (StepRecord) describing what happened

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Quick start (pause + resume)

from abstractruntime import Effect, EffectType, Runtime, StepPlan, WorkflowSpec
from abstractruntime.storage import InMemoryLedgerStore, InMemoryRunStore


def ask(run, ctx):
    return StepPlan(
        node_id="ask",
        effect=Effect(
            type=EffectType.ASK_USER,
            payload={"prompt": "Continue?"},
            result_key="user_answer",
        ),
        next_node="done",
    )


def done(run, ctx):
    return StepPlan(node_id="done", complete_output={"answer": run.vars.get("user_answer")})


wf = WorkflowSpec(workflow_id="demo", entry_node="ask", nodes={"ask": ask, "done": done})
rt = Runtime(run_store=InMemoryRunStore(), ledger_store=InMemoryLedgerStore())

run_id = rt.start(workflow=wf)
state = rt.tick(workflow=wf, run_id=run_id)
assert state.status.value == "waiting"

state = rt.resume(
    workflow=wf,
    run_id=run_id,
    wait_key=state.waiting.wait_key,
    payload={"text": "yes"},
)
assert state.status.value == "completed"

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Built-in Scheduler

AbstractRuntime includes a zero-config scheduler for automatic run resumption:

from abstractruntime import create_scheduled_runtime

# Zero-config: defaults to in-memory storage, auto-starts scheduler
sr = create_scheduled_runtime()

# run() does start + tick in one call
run_id, state = sr.run(my_workflow)

# If waiting for user input, respond (auto-finds wait_key)
if state.status.value == "waiting":
    state = sr.respond(run_id, {"answer": "yes"})

# Stop scheduler when done
sr.stop()

For production with persistent storage:

from abstractruntime import create_scheduled_runtime, JsonFileRunStore, JsonlLedgerStore

sr = create_scheduled_runtime(
    run_store=JsonFileRunStore("./data"),
    ledger_store=JsonlLedgerStore("./data"),
)

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AbstractCore integration (LLM + tools)

AbstractRuntime’s kernel stays dependency-light; AbstractCore integration lives in:

• src/abstractruntime/integrations/abstractcore/

Execution modes:

• Local: in-process AbstractCore providers + local tool execution
• Remote: HTTP to AbstractCore server (/v1/chat/completions) + tool passthrough (default)
• Hybrid: remote LLM + local tool execution

See: docs/integrations/abstractcore.md.

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Snapshots / bookmarks

Snapshots are named, searchable checkpoints of a run state:

• Snapshot(snapshot_id, run_id, name, description, tags, run_state)

See: docs/snapshots.md.

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Provenance (tamper-evident ledger)

You can wrap any LedgerStore with a hash chain:

• HashChainedLedgerStore(inner_store)
• verify_ledger_chain(records)

This is tamper-evident, not non-forgeable (signatures are optional future work).

See: docs/provenance.md.

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Documentation index

Document	Description
Proposal	Design goals, core concepts, and scope
ROADMAP	Prioritized next steps with rationale
ADRs	Architectural decisions and their rationale
Backlog	Completed and planned work items
Integrations	AbstractCore integration guide
Snapshots	Named checkpoints for run state
Provenance	Tamper-evident ledger documentation