Changelog

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0.4.1 (2026-07-17)

Additive provenance field: Mimir.Event gains path, a materialized call path — an ordered list of "<kind>:<id>" frames (closed kind union workflow | workflow_step | agent | conversation) naming the chain of scopes that contain the event, outermost first, innermost last, defaulting to []. One event, in isolation, recreates its full containment lineage; List.last(path) is the innermost scope the event belongs to (for a leaf event, its immediate container; for a scope-lifecycle event, the scope itself). This is deliberately the containment/spawn axis ("what scopes am I inside"), distinct from any data-dependency axis a caller tracks separately ("whose output did I consume") — the two can diverge and this field only carries the former. llm/2/agent/2/workflow/2 validate every frame against the closed kind set (bad kind or empty id → {:error, {:bad_frame, frame}}) — construction only ever writes known kinds. to_wire/1 includes "path" only when non-empty. from_wire/1 treats path as malformed-optional data and validates shape only — a well-formed "kind:id" pair, the kind NOT checked against the closed union — so an unknown-but-well-formed kind from a newer producer passes through intact (an additive kind is not a reader-breaking change); a missing key, a non-list, or a genuinely malformed frame degrades the whole path to [] rather than failing the parse. Mimir.Event.OTel.render/1 adds a "mimir.path" attribute (frames joined with /) when path != []; the frozen gen_ai.* byte-compat goldens are unaffected since none of those fixtures carry a path.

0.4.0 (2026-07-16)

Replaces the gen_ai junk-drawer envelope with a domain-typed event vocabulary. gen_ai is demoted to what it always should have been: a wire format at the OTel export edge, not a domain model.

  • Mimir.Event — the new vocabulary root: a closed domain (:llm | :agent | :workflow) × type union, typed correlation ids (request_id, workflow_id, step_id, session_id — the correlation spine is unchanged, just promoted to typed fields), promoted usage/ tool commons, and a raw carve-out for anything provider-specific. Event.llm/2, Event.agent/2, Event.workflow/2 build it; Event.to_wire/1 / Event.from_wire/1 are the struct-in-BEAM / JSON-at-the-boundary pair — to_wire/1 is the shape downstream storage should persist.
  • Mimir.Event.OTel — the one canonical OTel-attribute mapper for the export edge. llm.* reproduces the retired Mimir.TurnEvents.GenAI helpers' attribute names byte-for-byte (gen_ai.usage.input_tokens, gen_ai.tool.name, gen_ai.tool.call.id, the bare milestone reasoning marker); agent.* renders OTel GenAI agent semconv (gen_ai.operation.name=invoke_agent, gen_ai.conversation.id); workflow.* is plain mimir.workflow.* — no GenAI pretense.
  • Mimir.TurnEvents is rewritten around Mimir.Event: append/2 takes rid and an %Event{} — the buffer, not the caller, owns seq/ts, overwriting whatever the caller's constructor set. take/1/ take_current/0 return [%Event{}] in buffer-assigned seq order.
  • Mimir.Ingest promotes every ingested raw provider map to a %Event{} (domain :llm) before buffering. metadata's "workflow_id"/ "step_id" keys are unchanged, now threading into the event's typed workflow_id/step_id fields instead of a loose payload merge.
  • Mimir.RouteLog.to_meta/2's meta key is renamed gen_ai_events → turn_events (matching the persisted column name the gateway migrates to next); its one entry's payload key is renamed "gen_ai" → "decision". Routing decisions still never enter the Mimir.Event vocabulary — DecisionRecord/RouteLog keep their own audit shape, by design.

BREAKING

This is a big-bang rename — no deprecation shims, no dual shapes:

  • Mimir.TurnEvents's old append/3 (rid, type, gen_ai_map) is replaced by append/2 (rid, %Mimir.Event{}); the old append_current/2 is replaced by append_current/1 (%Mimir.Event{}).
  • Mimir.TurnEvents.take/1 / take_current/0 now return [%Mimir.Event{}], not [%{"seq" => _, "ts" => _, "type" => _, "gen_ai" => map()}].
  • Mimir.TurnEvents's envelope/4 is removed.
  • Mimir.TurnEvents.GenAI is removed. Its three builders (reasoning/1, tool_use/1, usage/2) have no drop-in replacement — build a Mimir.Event instead, and render it at the export edge with Mimir.Event.OTel.render/1 if you need the old attribute shapes.
  • Mimir.RouteLog.to_meta/2's meta map key gen_ai_events is renamed turn_events; its entry's "gen_ai" key is renamed "decision".

Migration: if you persist the old envelope shape (%{"seq" => _, "ts" => _, "type" => _, "gen_ai" => map()}), adopt Mimir.Event.to_wire/1 / Mimir.Event.from_wire/1 as the new persisted form — to_wire/1 is exactly what downstream storage should write instead. The mimir_gateway 0.4.0-line release is the reference migration for this: its request_log.gen_ai_events → turn_events backfill transforms every existing row from the old envelope into Event.to_wire/1's shape in place, row by row, inside the migration transaction — that transformer is the worked example to copy for any other store still holding the old shape.

0.3.0 (2026-07-06)

Replaces the routing layer's bare-map vocabulary with typed structs, parsed at a single boundary.

  • Mimir.RouteResponse — the parsed result of a routing call, with new/1 as the single boundary where a decoded (atom- or string-keyed) wire response becomes mimir's struct vocabulary. Mimir.RouterClient.route/2 now returns {:ok, %RouteResponse{}} directly — no ad-hoc atomization downstream.
  • Mimir.Grant, Mimir.Placement, Mimir.Candidate — the leaf structs RouteResponse.new/1 parses onto: a minted grant (key, budget, expiry), the flat chosen-model placement (lane, model, runtime), and one catalog entry's routing verdict (chosen, ranked, or excluded).
  • Mimir.Oracle.Placement is renamed Mimir.Oracle.Decision — the rich server-side decision (entry, reasons, candidate verdict table), distinct from the wire-level Mimir.Placement.
  • Mimir.DecisionRecord is now a struct (build/5 returns a %DecisionRecord{}); to_event/1 renders it to the binary-keyed audit map. The rendered turn-event shape is unchanged.

BREAKING

0.2.0 (2026-07-05)

Adds a governance composition layer on top of the routing oracle: Mimir.Guard, Mimir.Ingest, Mimir.Sessions.

  • Mimir.Guard — turn-guard builders for a session loop's between-turn hook. for_grant/3 prices the session's accumulated usage against a route response's grant and halts on budget; caps/1 is the mimir-less form (turn/token/cost caps, no minted key). Guards never raise mid-run: a pricing-table miss degrades to whatever caps remain and emits a [:mimir, :guard, :pricing_miss] telemetry event (once per process per model).
  • Mimir.Ingest — decision-correlated ingestion of raw session events into Mimir.TurnEvents, keyed by request id with the routing decision's correlation merged into each event's gen_ai map.
  • Mimir.Sessions — the canonical recipe: opts/2 turns a route response into a model_config (granted key plus routed base_url), a turn_guard, and telemetry_metadata, ready to splice into a session run.

These three target the documented hook contract of req_managed_agents 0.5.0+ by data shape only — the turn_guard payload shape and the synthetic "rma.text_delta" event — with no code dependency on that library. model_config.api_key threading is a harmless opaque passthrough on 0.5.0+ runtimes and activates fully as the enforced grant key once the embedder is on req_managed_agents 0.6.0.

Also: two new mix mimir.smoke stages (guard, sessions) covering the composition layer end-to-end.

0.1.0 (2026-07-04)

Initial release.

Modules: Mimir.Descriptor, Mimir.Oracle, Mimir.Catalog, Mimir.Snapshot, Mimir.Health, Mimir.DecisionRecord, Mimir.RouteLog, Mimir.Pricing, Mimir.TurnEvents, Mimir.RouterClient (with an HTTP implementation), and Mimir.Redact.

Design seams as features:

  • Injectable model resolver in Mimir.Catalog — validate or enrich catalog entries through your own registry without touching the oracle.
  • Explicit-inputs Mimir.Snapshot — the oracle only ever sees a snapshot the embedder assembled; no hidden reads of process state or global config.
  • Embedder-owned persistence — decision records and route logs are plain data; whether and how they're stored is entirely the embedder's call.

Also: a mix mimir.smoke task that drives the public API end-to-end as a repeatable, CI-asserted smoke check, and a mix quality alias (format check, warnings-as-errors compile, credo, dialyzer) for local and CI use.