shidoshi

An opinionated way to augment Jupyter Lab for iterative work.

shidoshi adds %ask / %%ask magics to Jupyter that let you talk to an LLM from inside a notebook — using the notebook itself, in order, as the conversation history. No separate chat pane, no copy-pasting context: your code cells, their outputs, and your notes are the context.

Install

Requires Python ≥3.13 and JupyterLab. Set an API key before use:

export OPENAI_API_KEY=sk-...       # for the openai provider (default)
export OPENAI_BASE_URL=...         # optional, e.g. to point at a proxy
export OPENROUTER_API_KEY=...      # for the openrouter provider

Installing across Jupyter environments

%load_ext shidoshi runs import shidoshi inside the running kernel process. That means shidoshi has to be installed into whichever Python environment the kernel you're using actually runs in. It ships a small shidoshi command for setup, but the library itself is not a standalone tool — so uvx / uv tool install (which run a tool in an isolated subprocess, separate from any kernel) don't apply here.

• Per-project venv with its own JupyterLab (e.g. a uv-managed project): add shidoshi as a normal dependency of that project.

  uv add shidoshi
  # or: pip install shidoshi
  

• One shared JupyterLab, many kernels (each notebook's kernel points at a different project venv registered via ipykernel install): install shidoshi into each kernel's venv. Installing it only where JupyterLab itself lives will not make it importable from other kernels.

  # inside the venv backing a given kernel
  uv add shidoshi
  # or: pip install shidoshi
  

Skipping %load_ext — the shidoshi kernel

To avoid typing %load_ext shidoshi in every notebook, register a kernel that loads it for you:

shidoshi install-kernel --sys-prefix

Pick Python 3 (shidoshi) from the Jupyter kernel list and the magics are already there. Nothing else changes: it is a stock Python kernel running this environment's interpreter — your imports, variables, and debugger all work exactly as before. The generated kernel.json just appends --IPKernelApp.extensions=shidoshi to the normal ipykernel_launcher command, with an absolute path to this environment's Python.

Useful flags:

Installing is refused if a kernelspec of that name already exists, so it won't quietly replace one you made by hand. Register one per environment with a distinct --name.

Remove it with jupyter kernelspec remove shidoshi.

With uv

Add shidoshi to the project, then register the kernel from inside it. Which location flag you need depends on where JupyterLab itself runs from, because Jupyter only searches its own sys.prefix, your user directory, and the system directory:

uv add shidoshi

# A: JupyterLab in an ephemeral env (uv's default suggestion).
#    Its sys.prefix is a uv cache dir, so --sys-prefix would be invisible.
uv run shidoshi install-kernel --user
uv run --with jupyter jupyter lab

# B: JupyterLab as a project dependency — sys.prefix *is* the project venv.
uv add --dev jupyterlab
uv run shidoshi install-kernel --sys-prefix
uv run jupyter lab

B keeps the kernel scoped to the project and disappears with the venv; A is the one that works with uv run --with jupyter. If a freshly installed kernel doesn't show up in the launcher, run jupyter kernelspec list the same way you start Lab — that prints exactly the directories being searched.

Either way this replaces the kernel step in uv's Jupyter guide — you don't need uv run ipython kernel install --env VIRTUAL_ENV ... as well, because install-kernel records VIRTUAL_ENV for you when it detects a venv.

That variable matters more than it looks. uv pip install resolves its target from VIRTUAL_ENV (falling back to CONDA_PREFIX, then a base interpreter) — never from the kernel that's running. So if you start Jupyter from a conda-activated shell, a kernel without VIRTUAL_ENV will import from your project venv while !uv pip install quietly installs into your conda base. Pinning it keeps both views on the same environment.

Two related notes:

• !uv add was always safe — it finds the project by walking up for pyproject.toml, so it ignores VIRTUAL_ENV and targets the project venv either way.
• %pip install needs uv venv --seed; uv venvs have no pip in them by default. Prefer !uv add.

Pass --env to set anything else the kernel should launch with (repeatable), including an override for VIRTUAL_ENV:

uv run shidoshi install-kernel --sys-prefix --env OPENAI_BASE_URL=http://127.0.0.1:18080/v1

Because the spec pins an absolute interpreter path, it can only ever start the environment shidoshi is installed in. That is the advantage over the ipython_config.py route below: ~/.ipython is shared by every Python environment under your $HOME, so putting the extension there makes every kernel on the machine try to import shidoshi, including ones that don't have it.

c.InteractiveShellApp.extensions = ["shidoshi"]

Quickstart

%load_ext shidoshi

(skip this line if you're on the Python 3 (shidoshi) kernel)

%%ask
What does the `history.build_history` function in this file do?

The response streams into the cell's output as Markdown.

Magics reference

• %ask <prompt> — line magic for a one-line prompt.
  • Prefix with model| or provider:model| to override the configured default model for just this call, e.g. %ask openrouter:openai/gpt-4o|summarize this.
  • Add --debug anywhere on the line to also show the full request/response payload.
• %%ask [model] — cell magic; the whole cell body is the prompt (multi-line is fine, and it can reference images via Markdown ![]()/<img> syntax or bare local file paths — they're inlined as base64). An optional model name on the magic line overrides the default for this call. Also supports --debug.
• %%skip — runs the cell normally, but the cell is left out of the context sent to the model entirely. Use it for scratch or exploratory cells you don't want the model to see.
• %%pin — runs the cell normally; its content and output are always included in context and are exempt from the auto-trim behavior below. Use it to protect a fact, constant, or definition you don't want dropped over a long session.

How context is built

Every prior cell in the notebook — up to the one you're currently running, and accounting for kernel restarts — is turned into conversation history automatically:

• Markdown cells become background text/image context (treated as notes or reference material, not instructions).
• Regular code cells appear as fenced code plus their text/image outputs.
• Prior %ask / %%ask cells become real user/assistant turns. Their responses are reused from a per-cell cache rather than re-sent, so replaying history doesn't resend answers the model already produced.
• %%skip cells are dropped entirely.
• %%pin cells are always kept.

Automatic context-length handling

If a request is rejected for exceeding the model's context window, shidoshi automatically retries, dropping the oldest trimmable history units first (markdown cells, then plain code cells, then whole ask+response pairs — %%pin cells are never dropped), up to 20 times. A banner reports how many cells were dropped so you know context shrank.

Providers & tools

• openai (default) — uses the OpenAI Responses API.
• openrouter — uses OpenRouter's chat-completions API; select it with the provider:model prefix, e.g. openrouter:anthropic/claude-3.5-sonnet.

Every request currently has the built-in web_search tool attached, so the model can search the web when it needs current information. (A web_fetch tool also exists in the codebase but isn't wired into the magics yet — not available today.)

Debug mode

Add --debug to %ask/%%ask to render a collapsible, syntax-highlighted panel showing exactly what was sent (system prompt, full message history, tools) and every raw event streamed back — useful when the model's behavior is surprising and you want to see the actual payload.

Configuration

shidoshi reads TOML config, layered as defaults → ~/.shidoshi/config.toml → ./.shidoshi/config.toml (project config overrides user config):

default_model = "gpt-5.5"   # model used when none is specified
reasoning_effort = "low"    # OpenAI only
ask_color = "#eafbea"       # highlight color for %ask/%%ask cells
skip_color = "#ececec"      # highlight color for %%skip cells

Development

uv sync
uv run pytest tests/unit tests/btp -v

Integration tests under tests/integration/ require a live OPENAI_API_KEY (or a proxy via OPENAI_BASE_URL) and are run with:

uv run pytest tests/integration/ -v -m integration

License

Apache License 2.0 — see LICENSE.