# Jujutsu × DSH — research digest Standalone record of a 14-turn AI Mode web conversation (single session, 7:42 PM – 7:59 PM) whose cleaned transcript (`chat-log/aimode-jujutsu-chat.md`, 1280 lines, ~75 KB) this digest replaces. The transcript was generated by `scripts/extract-chat.py` from a raw scrape kept at `chat-log/raw-aimode-conversation.md`. No private links, share URLs or machine paths are reproduced here. **Name.** The thread spells the project **"jijitsu"** throughout. That is a misspelling of **Jujutsu** (`jj`), and the repository uses the real name. It only matters where the thread coined literal strings — `jiujitsu.config.json`, `pnpm run jiujitsu:branch`, `isJiuJitsuProject`, `jiujitsu:sync` — which are quoted verbatim below as _what was written_, not as names to adopt. **Evidence grade — read this before trusting anything.** The thread is an assistant answering from web search inside an AI Mode chat. Nothing was executed, benchmarked, or checked against the DSH source or the `jj` binary. There are **no measured numbers in the entire conversation**; every DSH API claim below is a _claim_, several are mutually inconsistent, and a few are technically impossible as written. Only the `jj` command surface is plausible enough to use as a starting point, and even there the version-specific statements come from third-party docs, not from the tool. Sections are tagged `(claimed)` / `(suspect)`; the final section lists the concrete contradictions. --- ## Turn index | # | Question (short) | What it established | | --- | --------------------------------------------------------------------------------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------- | | 01 | "dsh harness we would like jiu jitsu to understand" | Assistant misread the topic as the martial art; asked three clarifying questions. No technical content. | | 02 | Force dsh not to use git — possible at tool-call level? | Claims a `tools/pre-execute` lifecycle pipeline exists; offers preset-patch disable of `tool-git` vs a runtime guard. | | 03 | Not training: code mods live on git, block git in pre-execute and tell it the exact command via static analysis | Assistant agrees; introduces `dsh-hook-protocol` / `hooks.json`, and the "throw an error containing the mandated command" pattern. | | 04 | Conditionally detect a project and use jijitsu | Footprint-based activation (`jiujitsu.config.json`, `src/techniques`, package name) so the guard drops out elsewhere. | | 05 | Simulated filesystem? Branching? | Claims virtual file tools (`vfs_read`/`vfs_write`) and "State Snapshot Isolation" branching — speculative, no source. | | 06 | Packaged fs utils or `node:fs` in a plugin? | Plugins must use `ctx.fs`; lists pluggable backends, intent/observation policy packages, `FsError`. | | 07 | Simulated bash environment? | No in-memory bash: real bash, OS-level confinement (`dsh-bash-local` vs `dsh-bash-sandbox`). | | 08 | "we dont want to show it… proper jijitsu branch and proper detection" | Assistant proposes a **silent** translation layer that fakes git stdout via `callContext.bypass`. | | 09 | "we dont want a silent translation layer" | Reversal: loud structural boundary — throw a `[SECURITY POLICY VIOLATION]` and mandate a script. | | 10 | How does jj-hunk come into play? | Non-interactive hunk selection for `jj`; native hunk ops otherwise need an interactive editor (`jj split -i`). | | 11 | Can jj commits be sent upstream to GitHub? | Yes: bookmarks + `jj git push`, `-c @` auto-bookmark, multi-remote config, force-with-lease semantics. | | 12 | Is `jj git init` good? Nested forks? | Colocated by default in recent versions; `jj git export` for `gh`; fetch-pattern narrowing; `jj workspace add`; `jj sparse set`. | | 13 | Deeper dive on workflow compatibility | AI editors, pnpm/Turborepo change detection, stacked PRs and GitHub Actions triggers, `gh`/CODEOWNERS review loop. | | 14 | How does a jj project handle `git commit` / `git branch`? | No staging area; `@` auto-snapshots; Change ID vs Commit ID; bookmarks bridge to git branches bidirectionally. | --- ## 1. DSH architecture and extension model (claimed) - DSH is described as built on the **Cordis framework**, "everything is a plugin"; the active tool set is composed from an agent preset file, and each profile has a patch file that configures or toggles plugins. - Cordis plugin contract shown: `export const name`, `export const inject = ['fs', 'tools']`, `export function apply(ctx: Context)`. - Package / identifier names asserted (none verified): `@deepseek-ai/dsh`, `@deepseek-ai/cordis`, `@deepseek-ai/dsh-tools` (`defineTool`), `@deepseek-ai/dsh-fs`, `@deepseek-ai/dsh-tool-git`, `dsh-hook-protocol` (with a `hooks.json` mapping), `fs-observation-policy`. - Example preset path given: `presets/standard.patch.yml`. - Preset-patch shape proposed for removing a tool entirely: ```yaml id: preset-standard config: id: standard plugins: - id: tool-git name: "@deepseek-ai/dsh-tool-git" disabled: true # <--- This completely strips the tool from the model's schema loop ``` - Caveat attached to it: target the tool config **inside the active preset block** or it is treated as a silent no-op. The assistant also warns a plugin removal is all-or-nothing, hence the guard approach. - Third-party context cited: a "Mirage" DSH plugin whose bundle "disables the standard filesystem and bash sandbox providers, then inserts Mirage-backed implementations" — i.e. the fs/shell seams are swappable. ## 2. Tool-call interception — the `tools/pre-execute` hook (claimed, partly suspect) - Core claim: every tool call passes an extensible allow/deny guard layer **before** the local tool executes, so git can be blocked at the tool-call level rather than by training or by shell tricks. - **Suspect:** two different registration syntaxes appear and are never reconciled — `ctx.tools.on('tools/pre-execute', (callContext) => {…})` (earlier turns) and `ctx.on('tools/pre-execute', async (callContext) => {…})` (later turns). - Call-context fields used: `callContext.name`, `callContext.args.command`, `callContext.args.text`, `callContext.args.path`. - **Suspect:** tool names used for matching are `execute_bash`, `terminal_write`, `git_commit`, `git_clone`, and "any name starting with `git_`". None were checked against the harness. - **Suspect:** `callContext.bypass((_args) => ({ stdout, stderr, code }))` — the silent-layer API. It appears only in the proposal the user rejected, and no source was cited for it. - Error-feedback claim: a `throw` from the hook puts the message string directly into the model's context as tool-failure feedback, so a model can read "use this exact command instead: …" and re-issue the call. Framed as especially effective for "DeepSeek R1/V4" reasoning loops. This is the mechanism the whole design rests on, and it was never tested. - Supporting claim from a third-party repo (`lxj808624/dsh-tool-git`): that tool executes arguments as an explicit array via `execFile` — "no shell injection: every command goes through execFile with an explicit argument array" — so checking `callContext.name` plus the `execute_bash` string gives full isolation. ## 3. Decision: a loud guard, not a silent translation layer The only settled design decision in the thread, reached through an explicit user correction. - **Rejected — silent translation.** The assistant proposed intercepting `git`/`bash`, faking a successful git result, and letting the model believe it ran git. Sample fake payloads: `stdout: "* main\n main"`; `stdout: "Switched to a new branch ''"`; `stdout: "[ <7 hex chars>] update jiu-jitsu structural matrix\n 1 file changed, 12 insertions(+)"`. Rationale offered: zero exposure, no error noise. The user rejected it outright. - **Adopted — loud structural boundary.** The hook terminates the call, states the constraint, and maps the intended action to a mandated command the model must run instead. Rationale in-thread: keeps the system "clean, visible, and totally trackable without any magic proxies", and forces the model to reason about the restriction and self-correct. - Final guard message template (earlier variants `GIT EXECUTION BLOCKED.`, `[PROJECT-LOCK] …`, `[SANDBOX ALERT] …` are **superseded**): ``` [SECURITY POLICY VIOLATION] Workspace Status: Jiu-Jitsu Domain Detected. Constraint: Direct Git operations are strictly disabled. Static Routing Action: Execute the following platform command to perform your intended modifications: `` ``` - Detection is deliberately overt: check for a signature file rather than masking payloads (`await ctx.fs.exists('/jiujitsu.config.json')`). ## 4. Conditional project detection (claimed) - The guard must be scoped to one repository, not global, so it silently drops out of the lifecycle loop elsewhere. Detection signals proposed, in order of preference: - `ctx.fs.exists('/jiujitsu.config.json')` - `ctx.fs.exists('/src/techniques')` (registry directory) - fallback: read `package.json` and match `pkg.name` against `jiujitsu` / `jiu-jitsu` - earlier, Node-based variant used `process.cwd()` + `fs.existsSync(path.join(projectRoot, …))` - Explicitly flagged as unresolved: whether the rule applies to a monorepo folder only or to every folder the agent opens — the assistant asked twice and never got an answer. ## 5. Filesystem access: `ctx.fs` over `node:fs` (claimed) - Rule stated: plugins should use the harness's packaged fs utilities (`ctx.fs`), never `node:fs` directly. - Stated reasons: 1. **Pluggable backends** — `fs-local`, `fs-sandbox`, or a virtualized overlay (Mirage). Importing `node:fs` escapes the configured sandbox and exposes the real disk. 2. **Policy enforcement layer** — `fs/write-intent`, `fs/edit-intent` and the `fs-observation-policy` package track read-before-edit validity; going through `ctx.fs` lets other plugins enforce bounds. 3. **Structured errors** — `ctx.fs` normalizes failures into typed `FsError` schemas with predictable error codes the model loop can read and recover from. - Usage shown: `await ctx.fs.readText('/sandbox/jiujitsu-core/positions.json')` inside `ctx.on('ready', …)`; `ctx.fs.exists(...)`, `ctx.fs.writeText(...)` used elsewhere. - Package note quoted from the docs: `deepseek-ai/dsh-fs` — "You rarely load dsh-fs directly: you mount a backend that registers as `ctx.fs`". For model-facing commands, the thread points at `defineTool` from `@deepseek-ai/dsh-tools`. ## 6. Bash execution and sandboxing (claimed) - Position: DSH **does not** simulate bash in memory. It runs real bash commands inside a restrictive process-level sandbox. - Claimed seam and modules: - `ctx.shell` — modular shell executor layer. - `dsh-bash-local` — commands as fresh, raw `bash -c` subprocesses with the user's permissions. - `dsh-bash-sandbox` (**default mode**) — real bash trapped by the OS: Linux bubblewrap (`bwrap`) / Landlock, macOS Seatbelt, Windows ACL restricted tokens. - Every execution is interceptable _before_ the platform runner spawns the OS process, whether via the one-shot `dsh-tool-bash` or the stateful `dsh-terminal-bash`. - Quoted doc line: "On POSIX, dsh-bash-local runs commands as fresh `bash -c` processes and dsh-bash-sandbox confines every command through the sandbox". - Confinement boundary named: `workspace-write`. - Flagged: one citation in this turn was an unattributed "CVE-2026" snippet about an agent holding a shell. No CVE id, no detail — treat as unsubstantiated noise. ## 7. Simulated filesystem and virtual branching (suspect — no source, likely invented) Presented as DSH behaviour but backed by nothing checkable; recorded only so the idea is not re-derived. - Claim: the model interacts with a virtualized state tree via tools named `vfs_read` / `vfs_write`, and detection happens on the virtual path (`callContext.args.path` starting with e.g. `/sandbox/jiujitsu-core`). - Claim: branching without git is handled by "**State Snapshot Isolation**" — immutable state trees, forking a virtual context array or cloning a JSON state object per branch; successful forks get "committed back" through the static pipeline, failed forks are dropped without touching real history. - Claim: a virtual data provider at `/plugins/jiujitsu-sync` would be the mandated target. - The thread's own concrete fallback (much more plausible): keep branch variants as plain JSON files in the workspace, e.g. `src/techniques/vfs-branches/guard-variant.json`, read/written through `ctx.fs` or approved scripts. The silent-layer variant copied `src/techniques/schema.json` to `/src/techniques/vfs-branches/.json` on first use. ## 8. Proposed static command mapping (design artifact — never implemented) The hook's job was to translate blocked git intent into a mandated script. The mapping changed three times; the last version is the one that survived the user's pushback. Earlier mappings are **superseded**. | Blocked intent | Mandated command | | --------------------------------- | ---------------------------------------------------------------- | | `checkout -b` / `branch` (final) | `pnpm run jiujitsu:branch --name=` | | `commit` / `add` (final) | `pnpm run jiujitsu:sync` | | anything else (final) | `pnpm run jiujitsu:validate` | | add/commit (superseded) | `pnpm run db:sync-jiujitsu` | | status/diff (superseded) | `pnpm run lint:schema` | | checkout -b / branch (superseded) | `pnpm run state:fork-branch` | | fallback (superseded) | `pnpm run build:jiujitsu-registry` | | add/commit, earliest (superseded) | `node ./scripts/validate-jiujitsu-schema.js --update-cache` | | fallback, earliest (superseded) | `npm run build:jiujitsu-registry` | Note the package-manager drift in the thread's own samples: `npm run …` in the earliest version, `pnpm run …` afterwards. ## 9. Jujutsu: hunk-level operations and `jj-hunk` - A **hunk** = a contiguous block of modified lines inside a file's diff. - Native `jj` rewrites history at commit/file level (`jj split`, `jj squash`), but isolating individual hunks or lines forces the **interactive diff editor** (`jj split -i`). That TUI requirement is the roadblock for headless agents. - `jj-hunk` (also referred to as `jj-hunk-tool`; upstream project `laulauland/jj-hunk`, described as "Non-interactive hunk distribution in jj CLI", published on crates/lib.rs and as a Smithery skill) is the CLI bridge that bypasses the TUI. - Commands attributed to it: - `jj-hunk split` — non-interactive splitting of working-copy (`@`) changes into discrete commits. - `jj-hunk squash` — merge targeted hunks into designated parent/ancestor revisions, ignoring other changes in the same file. - `jj-hunk list` — "List hunks, files, or spec templates"; diffs a revision against its parent and exports it. - `--format json|yaml|text` — output format selector (default `text`), letting a plugin statically inspect the payload. - **Suspect:** the claim that `jj-hunk` "assigns stable IDs to each patch chunk" was asserted but never demonstrated; no id syntax or example output appears anywhere in the thread. - Intended use: let the DSH plugin inspect the structured hunk payload to decide routing rules, and let an agent isolate/version domain data inside the sandbox. Also proposed for pre-push CODEOWNERS verification. ## 10. Jujutsu → GitHub: bookmarks, push, force semantics - `jj` operates natively on a Git backend and pushes upstream to GitHub; it tracks changes by **Change IDs** rather than branch pointers. - GitHub needs named refs, so `jj` uses **Bookmarks**: ```bash # 1. Attach a named bookmark to your current working revision (@) jj bookmark create my-feature-branch -r @ # 2. Push the bookmark up to your GitHub remote jj git push --bookmark my-feature-branch ``` - Quick PR path: `jj git push -c @` auto-creates a randomized bookmark and pushes it, then prints the standard GitHub PR-creation link. Example generated name given: `push-sytrsqlnznzr`. - Multi-remote (fork vs upstream), set via `jj config edit`: ```toml [git] fetch = "upstream" push = "origin" ``` Then `jj git fetch` pulls from the org and `jj git push` targets the fork. - Force semantics: because `jj squash` / `jj amend` / `jj rebase` rewrite commits, `jj git push` behaves like `git push --force-with-lease` — it updates an existing PR branch while running safety checks. - Cheat-sheet variants cited: `jj git push -b main` (older spelling, alongside the modern `jj git push --bookmark`), and rebasing a chain with `jj rebase -r new-feature -d main`. - Core command surface listed in a cited tutorial: `new`, `describe`, `commit`, `prev`, `next`, `squash`, `rebase`, `abandon`, `fix`, `absorb`, `bisect`. - Authentication for `gh` was raised as a question and never answered. ## 11. `jj git init`, configuration, nested forks, unsupported Git features - `jj git init` works and, in modern versions, creates a **colocated workspace** by default: `.jj` and `.git` sit in the same root, so git-native tooling and GitHub Actions keep working. Cited version detail: "In jj 0.42 and 0.43, `jj git init` is colocated by default (`--no-colocate` opts out), so most jj repos an agent meets are colocated." - Recommended follow-ups after init: - `jj bookmark track main@origin` — explicit upstream tracking so local work rebases automatically. - `[git] fetch`/`push` mapping in `~/.config/jj/config.toml` (global) as in §10. - `jj git export` — "Pushes current jj state into the local `.git` directory", needed before tools that read standard git refs, e.g. `gh pr create`. - **Nested-fork bottleneck (claimed):** `jj git fetch` imports _every_ reference into the operation store (`op store`), so hundreds of forks/parent repos cause command-line slowdowns. Fix — narrow the fetch patterns: ```toml [git] fetch = ["refs/heads/main", "refs/tags/*"] ``` - **Worktrees:** Git's `git-worktree` is explicitly unsupported by the jj backend. Use jj workspaces instead: `jj workspace add ../nested-fork-feature` (distinct working directory, same repository storage). - **Sparse checkout:** jj does **not** support Git's sparse-checkout engine or partial blob clones (`--filter=blob:none`). Use jj's own sparse system, which keeps patterns in the `.jj` metadata store: `jj sparse set --minus "path/to/heavy-nested-directories"`. - Cited Git-compatibility list — **unsupported**: `.gitattributes` (No), hooks (No), submodules (No), partial clones (No), `git-worktree` (No), sparse… (the source snippet is truncated at "Spa…"). Recorded as cited-but-incomplete; the "No" for `.gitattributes` is questionable and unverified. ## 12. Workflow compatibility (claimed) **AI coding assistants and editors (Cursor, Copilot, Trae).** In a colocated workspace the editor sees a normal git working directory and normal modified-file status. Failure mode: an editor's "commit" button or an agent auto-generating a commit message will call `git commit`, which a hard harness-level git guard breaks. Fix: have agents run `jj commit -m "..."`, or rely on jj's automatic working-copy commits (every file modification is instantly recorded into `@` with no explicit command). **pnpm monorepos and Turborepo.** Turborepo decides changed packages and cache reuse from git hashes (`git diff`). Because jj does not export every change into the local `.git` ref map instantly, cache pipelines can break. Fix: run `jj git export` on a file-watch hook, or prepend it: ```bash jj git export && pnpm build ``` Lockfile churn: switching between change pathways changes the working directory instantly via the anonymous-commit system, so a shared `pnpm-lock.yaml` can look permanently out of sync unless package changes are committed to a stable parent revision. **CI/CD and stacked PRs.** The thread's table: | Step | Traditional Git | Jujutsu | | ------------------ | ----------------------------------------------------------------- | ---------------------------------------------------------------- | | Dependency updates | manual conflict management across feature branches | concurrent change IDs rebase automatically when `main` updates | | Creating a chain | `git checkout -b feature2` off `feature1`, manual parent tracking | create a new commit over an existing change ID (`jj new`) | | Submitting PRs | push separate branch names, link them in the GitHub UI | `jj git push -c ` pushes individual commits as distinct PRs | - GitHub Actions only trigger when a **named ref** changes. Local experimental jj commits create no branch until a bookmark is attached, so changes stay sandboxed locally until deliberately exported. - After a bot merges a PR, `jj git fetch` pulls the update and jj automatically rebases local stacked changes onto the new upstream head (no manual conflict cycle claimed). **Code review.** When a reviewer requests changes, skip checkout+fixup+squash: `jj edit `, edit in place, `jj git push` — jj updates the existing tracking bookmark and the PR file tree. For repos with a `CODEOWNERS` layout, the thread suggests using `jj hunk` parsing locally to verify line-by-line ownership before pushing a bookmark. (Note: spelled `jj hunk` here, `jj-hunk` elsewhere — same tool.) ## 13. Jujutsu semantics: how `git commit` and `git branch` map - **No staging area.** Every file edit is auto-recorded into the open-ended working-copy revision `@`; there is no `git add`. `jj new` closes the current change and starts a fresh empty working copy on top. - **Two identifiers per revision:** - **Change ID** — permanent, stable across rewrites. - **Commit ID** — cryptographic hash (git-commit equivalent) that changes whenever contents change. - **Branches are anonymous by default.** A new line of history is just `jj new `; naming is optional. **Bookmarks** are the named labels that translate to git branches. - **Bidirectional sync in a colocated workspace:** `jj bookmark create my-feature` instantly exports a branch ref into `.git`; conversely, a `git branch` switch done by another tool is picked up by jj on its next execution, which updates the active `@` indicator to match. | Operation | Git | Jujutsu | | -------------------------- | ---------------------------------------- | ---------------------------------------------- | | Save modifications | `git add` then `git commit` | automatic — every save updates `@` | | Start a new task | `git checkout -b feature-name` | `jj new` (naming optional) | | Rewrite/amend earlier work | `git commit --amend`, interactive rebase | `jj squash`, `jj edit ` | | Prepare for remote push | push a local branch name | `jj bookmark create ` then `jj git push` | ## 14. Errors, contradictions and dead ends in the thread - **`Math.hex()` is not a JavaScript API.** The silent-layer sample calls `Math.hex().substring(0,7)` to fake a commit hash; the snippet cannot run as written. - **Hook registration is inconsistent** (`ctx.tools.on(...)` vs `ctx.on(...)`) with no resolution. - **Tool names are probably wrong.** `execute_bash`, `terminal_write`, `git_commit`, `git_clone` are used as if they were DSH tool names; nothing in the thread verifies they exist. - **`callContext.bypass` is uncorroborated** and was only needed by the approach the user rejected. - **The simulated-filesystem material (`vfs_read`, `vfs_write`, "State Snapshot Isolation", parallel reasoning-trail forks) cites no source at all** and is the least credible part of the thread. The plausible residue is "keep branch variants as JSON files and route through `ctx.fs`". - **Version drift:** colocated-by-default is asserted for jj 0.42/0.43 while an earlier answer treats colocation as an option to opt into. Verify against the installed `jj --version`. - **Push syntax drift:** `jj git push -b main` (older) vs `jj git push --bookmark ` (current). - **Nothing was validated against the DSH checkout.** No file in the harness was read; no `jj` command was run; no hook was loaded; no exit code or output format was observed. - The `jj-hunk` "stable IDs per hunk" and the Turborepo "caching pipelines can break" claims are plausible-sounding assertions with no evidence. ## 15. Open questions left unresolved 1. Which of the DSH APIs actually exist — the correct hook registration, the real tool names, the real `ctx.fs` surface, and whether `callContext.bypass` exists at all. 2. Whether the guard is monorepo-scoped or global (asked, never answered). 3. How "branch" should be realised for real: the thread's `pnpm run jiujitsu:branch --name=` shim versus native `jj bookmark create `. The two halves of the conversation never met. 4. Whether `jj-hunk` is actually needed, and whether it is installed/available, versus driving `jj split -i` non-interactively by other means. 5. How the virtual-branch design would handle `git merge` and multi-file parallel updates (asked, not answered). 6. Turborepo cache synchronisation versus merge-conflict resolution when bots edit files the agent is working on (asked at the end, unanswered). 7. `gh` authentication strategy inside a jj architecture (asked, unanswered). 8. Whether to set up a colocated workspace alongside an IDE configuration, and whether to automate `jj git export` in pipelines (asked at the end, unanswered). ## 16. Verification status | Area | Status | | ------------------------------------------------------------------------------------ | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | Measured numbers, timings, byte/token counts | **None exist in the thread.** Only wall-clock turn stamps (7:42 PM – 7:59 PM) and the transcript's own size. | | DSH architecture, hooks, `ctx.fs`, `ctx.shell`, sandbox modules, preset patch syntax | Claimed from web search; **unverified**, partly self-contradictory. Treat as hypotheses to check against the checkout. | | `vfs_read` / `vfs_write` / State Snapshot Isolation / `callContext.bypass` | **Unverified and uncited**; do not build on them. | | `jj` command surface (bookmarks, push, export, workspace, sparse, config) | Consistent with jj's documented model, but **not executed here**; verify flags against the installed version. | | jj version specifics (0.42/0.43 colocated default) and Git-compatibility list | Cited from third-party docs inside the thread; **unverified**, and the compatibility snippet was truncated. | | `jj-hunk` subcommands and `--format` values | Cited from the upstream project listing; **unverified**, no observed output. | | Sources cited | A repo overview ("Everything is a Plugin"), a TinyFish integration video (12:53), a crash course (2m), a third-party article, jj docs pages, cheat-sheet gists, and one unattributed CVE snippet. None were re-read. |