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Issue #2: ratatoskr.sessions covers the session-lifecycle endpoints needed by --send --new (POST /sessions) and the eventual TUI startup picker (GET /sessions). Two FN blocks (create_session, list_sessions) plus two shared frozen dataclasses (SessionInfo, SessionPage). complexity=low; estimated 150 LOC. Bundles both endpoints in one contract because they share the response- envelope shape — SessionInfo carries the union of POST-response fields (message_count) and list-item fields (name, archived, tags), with the origin-conditional fields defaulting to None. INV-001/002 spell out which fields come from which source so callers can rely on the discriminator. INV-006 refuses out-of-range limit (< 1 or > 200) client-side: spec §GET /sessions says the server returns 422; the client checks first so a 422 from this endpoint indicates server-side spec drift, not a client bug. INV-003 codifies the opaque-cursor discipline (spec §Pagination: "Cursors are opaque to clients — do not parse or construct them."). list_sessions threads next_cursor verbatim; never base64-decodes. Exception .body truncation to [:1024] inherited from issue #1's SseConnectFailed/CancelFailed precedent. First contract in this repo to carry a ## Out of scope H2. Future /volva-code-review consults will auto-resolve that section instead of needing --out-of-scope overrides. Six explicit exclusions: Bifrost binding (Worldtree #160), ephemeral/Saga sessions, single- session fetch, PATCH/DELETE mutation, history pagination, transparent multi-page iteration. Server retry/backoff is caller's policy. dependencies: lists issue #1 as a convention-dependency only — no code import; same API-consumption posture (caller-owned httpx client, async-native, frozen dataclasses, no Worldtree-source imports). prd: pinned to issue #2 body SHA-256 01fbbd52b6d90eb0 at 2026-05-21T04:45:06+00:00; scripts/contract_drift_check.py returns clean.
Ratatoskr
A Worldtree Conversation API debug TUI. Runs up and down Worldtree's API surface — sessions, turns, persona, tools, admin events, Bifrost state — carrying messages between layers. Like the squirrel.
The product is the observability surface; chat is the input mechanism. Devs run Ratatoskr against a local Worldtree to watch a turn flow through every layer of the system, side-by-side, in one terminal.
Status
v0 scaffold. Design locked; implementation hasn't started. The dev team owns the implementation pass.
Read in this order
docs/design-brief.md— the locked design. Read this first. Every architectural decision is recorded with its rationale, the alternatives considered, and (where relevant) the operator's lock-in moment.docs/SPEC-PIN.md— what Worldtree spec version Ratatoskr is built against, where the vendored snapshot lives, and how to bump the pin.docs/conversation-api-spec.md— the vendored Worldtree spec snapshot. Read this to understand the API surface Ratatoskr consumes. Do not import anything from a Worldtree checkout — the boundary is the spec, not the code. Seedocs/design-brief.md§2.CLAUDE.md— Claude Code conventions for this repo (mostly inherited from the Corviduo template).persistent-memory.md— durable intent across context resets. Update as decisions and state evolve.
Quickstart
# 1. Environment
uv venv && source .venv/bin/activate
uv pip install -e ".[dev]"
# 2. Verify the spec pin
cat docs/SPEC-PIN.md # documented Worldtree SHA + bump procedure
# 3. Tests (none yet; scaffold only)
uv run pytest
# 4. Run against a local Worldtree (once implementation lands)
# Worldtree must be running: python -m core.conversation_api
ratatoskr --agent mimir
What this repo is NOT
- NOT a polished consumer for Worldtree's end-users — that's the web app.
- NOT a Worldtree admin tool — admin CLI is separate (
sessions_cli.pylives in Worldtree). - NOT a featuretracking shadow of the web app — when the Conversation API surface grows, Ratatoskr does not necessarily grow with it.
- NOT a remote-Worldtree debug client — file-tail surfaces (persona log, server log) assume local-dev posture.
The full negative-clause list lives in docs/design-brief.md §6.
Boundary rule
Ratatoskr depends on three things only:
httpx+httpx-sse(network layer)textual(TUI framework)- Worldtree's published Conversation API spec at the pinned SHA
Hard rule: no imports from a Worldtree checkout. No core.* imports,
no from worldtree.*, no shared models, no submodule of Worldtree. The
spec is the entire surface. Boundary smoke test at tests/test_no_worldtree_imports.py
enforces this in CI.
Version-skew strategy
The dev team is decoupled from Worldtree's dev team. To detect drift when Worldtree changes the API:
- Spec-version pin in
pyproject.toml(worldtree-spec-rev). Bump explicitly; bumps are a tracked action. - Recorded-SSE snapshot tests at
tests/snapshots/. Captured against a live Worldtree; replayed in CI. Re-record after every pin bump. - Conformance smoke test — boots Worldtree via Docker compose in CI, runs a one-turn happy path. Catches integration-level drift.
See docs/SPEC-PIN.md for the bump procedure.
Consumer-side discoveries
If you find a spec gap, ambiguity, or missing-but-needed endpoint while working on Ratatoskr: route the discovery back to worldtree-dev via althing rather than via PR on Worldtree directly. The separate-team boundary is intentional and helps catch spec gaps that an in-tree consumer would paper over.
Related repos
- Worldtree — the API Ratatoskr consumes
- brokkr-smithy — authored this design brief
- Skaldsong — another Worldtree API consumer (Python; render-and-aggregate pattern)
- mead-hall — another Worldtree API consumer (TypeScript; server-side broker)