mimir_workflows

Deterministic workflows for agent steps on the BEAM.

mimir_workflows provides a Step behaviour, DAG operations, a declarative string-keyed workflow IR with pluggable compile passes, and an in-memory phase runner with concurrency caps and explicit failure results.

Kind-agnostic by design — the IR validates universal shape; "kind" vocabulary belongs to the host. One engine serves a code-review pipeline and an agent composition equally.

30 seconds

spec_map = %{
  "name" => "brief",
  "version" => 1,
  "params" => ["month"],
  "steps" => [
    %{"id" => "analyze", "kind" => "agent", "depends_on" => [],
      "input" => %{"q" => "KPIs for {{params.month}}"}},
    %{"id" => "narrate", "kind" => "agent",
      "depends_on" => ["analyze"], "input" => "{{analyze}}"}
  ]
}

# Compile: schema/dag/refs built-ins + your own passes (policy, budget, kinds).
# Diagnostics accumulate across ALL passes — the caller sees every problem at once.
{:ok, spec, _warnings} = MimirWorkflows.Compiler.compile(spec_map, passes: [{MyApp.PolicyPass, tenant}])

# Lower IR steps onto your Step modules and run: minimal phases, parallel in-phase.
steps =
  for step <- spec.steps do
    %{id: step.id, module: MyApp.kind_module(step.kind),
      params: step.raw, depends_on: step.depends_on}
  end

{:ok, results} = MimirWorkflows.Runner.run(steps, telemetry_meta: %{workflow_id: "wf_1"})

MimirWorkflows.Result.usage(results)
#=> %{"input_tokens" => 1200, "output_tokens" => 340, "calls" => 2}

Invariants

Depends on nothing in-house — no Mimir.*, no ManagedAgents.*, no RMA or Jido types (grep-enforced in CI). Only :telemetry.
Step ids are opaque terms, never atomized — untrusted IR never mints atoms; parsed specs keep string ids.
Policy, budget, allowlists, routing, agent registries are host concerns, delivered through MimirWorkflows.Compiler.Pass and step params/modules. Governed agent execution lives one layer up, in mimir_orchestration.
Graceful degradation (convention): conditional steps stay in the DAG and no-op ({:ok, %{"skipped" => true}}) rather than mutating graph shape — the DAG stays static and analyzable.

Telemetry

event	measurements	metadata
`[:mimir_workflows, :run, :start]`	`system_time`	`run_ref` ∪ `telemetry_meta`
`[:mimir_workflows, :run, :stop]`	`duration`	`run_ref`, `status`
`[:mimir_workflows, :step, :start]`	`system_time`	`run_ref`, `step_id`, `phase`
`[:mimir_workflows, :step, :stop]`	`duration`	`run_ref`, `step_id`, `phase`
`[:mimir_workflows, :step, :exception]`	`duration`	+ `reason`

The telemetry_meta option is how hosts thread correlation ids into every event without the library knowing what they mean.

What this is not

No durability, persistence, resume, human-in-the-loop, or compensation/rollback — a durable tier is a deliberate later decision, made when a concrete workflow demands it, evaluated against existing OTP-native options first. No conditionals in the IR (additive later). No workflow registry (hosts persist their own declarations; the library compiles values).

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