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Reshape the TUI from vertical-stack single-pane to Horizontal two-column with TabbedContent on the right; v1 has a single Tools tab that consumes ToolStart/ToolResult SSE events previously rendered inline in the transcript. Foundation for the rest of design-brief §5; subsequent panes (Persona/AdminEvents/BifrostState/ ServerLog) plug in as sibling TabPanes when their substrate blockers resolve. Three coupled pieces, all in-place amendments to issues #4 + #12: - **Layout**: compose() yields Horizontal#main-row containing Vertical#left-column (transcript + thinking-current + prompt) and Vertical#right-column (TabbedContent#side-panes with TabPane#tools-tab → RichLog#tools-log). Width split 2fr:1fr. CSS dock rules narrow to per-container scope so thinking-current toggling doesn't reflow the right column. - **Tools pane**: TuiPresenterState.render() signature widens with tools_log: RichLog. ToolStart/ToolResult route there per INV-014; every other event keeps its issue-#12 routing. Plain-label fallback under render-exception preserves routing (INV-009). - **Ctrl+1 binding + pane-name widget**: BINDINGS gains Binding("ctrl+1", "focus_tools") which programmatically sets TabbedContent.active; Textual's default preserves Input focus per INV-016 (test asserts; regression path documented). Static#pane-name in the footer renders "Tools" v1 (static — no tab-switch handler wiring lands in #13 per amendment-2 from Volva paraphrase review). CLI mode (--send) is unaffected by design per INV-018 — non- interactive, no tabs concept; CLI keeps inline tool-event rendering. Contract: docs/contracts/issues/13.contract.md (drift-check clean, two amendments applied from Volva contract-paraphrase pass). Tests: +9 net (TestLayoutShape × 7 + TestTuiPresenterState routing × 3, minus 1 deprecated test_tool_start_demoted superseded by test_tool_start_routes_to_tools_log). 236 total GREEN; ruff clean. Live smoke against personal Worldtree's mimir: tool-using turn (KB search) populated tools_log with tool_start + tool_result for search_library + read_note; transcript stayed chat-only with worker_phase + thinking. Routing-not-duplication confirmed end-to-end.
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)