dsh-lint-loop

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Zero-config lint feedback loop — a DeepSeek Harness (dsh) plugin that closes the edit → lint → fix loop: the model edits a file, immediately sees the lint findings (rule, file:line:col, message, fixable), and can auto-repair them with one lint_fix call. Uses whatever the repo already has — eslint, biome, or ruff. No setup, no bundled linters.

What the model gets

| Tool | Purpose | |---|---| | lint_diagnostics | Lint findings for one file (or all files the linters have seen), with rule, file:line:col, message, and a fixable flag; severity filter and max cap. Takes file_path (alias file). Call right after editing a file. | | lint_workspace_errors | All errors across files linted this session — the "what is broken right now" view. | | lint_fix | The killer feature — runs the repo's own auto-fixer (eslint --fix / biome check --write / ruff check --fix) on ONE file, re-lints, and returns what changed (+added/-removed lines), remaining findings, and the linter used. Takes file_path (alias file). Workspace-root files only. |

Plus an optional auto-injected system prompt section (lint:findings, order 75 — right after lsp:diagnostics): after the model writes/edits a file through the harness, the plugin subscribes to the fs/observed event, lints the file through its serial pool, and injects only the new/changed findings introduced by that edit — errors only by default (set sectionSeverity for more), top 5 lines, never the whole workspace. Stale deltas expire (sectionTtlMs, default 30s). Rendered findings carry a source code frame (the offending line marked █, plus a line of context) so the model fixes without re-reading the file. And the completion gate (below) stops the turn from closing while edited files still have errors.

The completion gate (0.2)

Edit → lint → fix is only closed if the model actually fixes what it broke. On the harness agent/turn-stopping seam — a serial checkpoint before the turn closes — the plugin checks the files edited during this turn. If any still carry errors, it steers the agent for another step with the exact findings, instead of letting it finish:

lint: this turn cannot finish cleanly — 2 errors remain in file you edited.
# lint findings (2 errors)
src/a.ts:3:10  error  no-unused-vars  'x' is defined but never used
src/a.ts:7:5   error  eqeqeq          Expected '===' and instead saw '=='.
(fix them (lint_fix repairs what it can), then finish — this nudge is capped per turn)

It is deliberately self-limiting — the first-party Claude Code bridge has an explicit TODO for a loop guard, and this gate has one built in:

• each file is evaluated once per stopping (re-editing re-arms it, finishing does not loop on a stale set);
• each turn forces at most gateMaxSteers continuations (default 2), then admits the turn;
• only files the model itself touched this turn are considered — pre-existing errors in untouched files never block;
• gate: false disables it entirely; autoInject: false also disables it unless gate: true is set explicitly.

Nothing about the gate is a hard veto — it is a bounded nudge, so it can never wedge a session.

The loop

model edits file  ──►  dsh writes it (fs tool)
                        │
                        ▼ fs/observed event
        plugin lints the file with the repo's own linter
                        │
                        ▼ new/changed findings only (errors by default)
        delta injected into the prompt (or lint_diagnostics on demand)
                        │
                        ▼
        model reads "src/a.ts:12 no-unused-vars …"  ──►  lint_fix ──►  clean
                        │
                        ▼ turn about to close
        gate: errors still in edited files? ── steer one more step (capped)

Zero configuration

The plugin probes the repo root for what is already there and routes by extension:

| Config found | Linter | Files | |---|---|---| | eslint.config.{js,mjs,cjs,ts} or .eslintrc.{js,cjs,json,yml} | eslint | .ts .tsx .mts .cts .js .jsx .mjs .cjs | | biome.json / biome.jsonc | biome | same JS family | | ruff.toml / .ruff.toml / pyproject.toml with [tool.ruff] | ruff | .py .pyi |

• Multiple configs coexist? JS-family files go to eslint by default; biome only when a biome config exists WITHOUT an eslint config. Force the set with the linters config key.
• Repo-local installs work: npm i -D eslint puts the binary in node_modules/.bin — the plugin resolves it before PATH.
• Nothing configured? The plugin stays quiet; calling a tool returns the init hint (npx eslint --init / biome init / ruff) instead of an error.
• Config file changes (adding biome.json mid-session, say) are observed and re-probed automatically.

Example (input → output):

lint_diagnostics { file_path: "src/extract.ts" }
# lint findings (1 error, 1 warning)
src/extract.ts:12:3   error  no-unused-vars  'foo' is defined but never used
  11 | export function extract(input: string) {
  12 |   const foo = parse(input)  █
  13 |   return input
src/store.ts:8:5      warn   semi            missing semicolon  [fixable]

The canonical JSON (rule, file, line, col, severity, message, fixable, linter) is what execute returns; the compact table + code frame above is the rendered view. file_path matches the harness's native fs tools; the file alias works too. And the fix:

lint_fix { file_path: "src/store.ts" }
# lint_fix (eslint) — src/store.ts
fixed: yes (+0/-1 lines)
remaining: none — file is clean

Install

Requires dsh (any install path — npx, npm, or source) and Node ≥ 22. The linters themselves are NOT bundled — the plugin uses whatever the repo already has.

# from npm (prebuilt)
npx @deepseek-ai/dsh plugin --profile web add dsh-lint-loop

# or from a directory containing this checkout
npx @deepseek-ai/dsh plugin --profile web add ./dsh-lint-loop

Restart the Web UI (npx @deepseek-ai/dsh web) — startup logs confirm each tool:

[dsh-lint-loop] plugin loaded
[dsh-lint-loop] registered tool: lint_diagnostics
...

Missing a linter entirely? The tools say so, with the exact install command: linter "eslint" is not installed or failed to run. Install it with: npm i -D eslint.

Using it

In a workspace session, ask the agent:

• "Edit src/extract.ts, then check it with lint_diagnostics." — the section may already have shown the findings.
• "Fix all the auto-fixable lint problems in src/store.ts." (lint_fix)
• "What lint errors exist right now?" (lint_workspace_errors)

Configuration

Options are passed as the plugin row's config in the profile patch (or defaults are used if absent):

# $DSH_HOME/profiles/<name>/cordis.patch.yml — a bare row overrides by id.
- id: lint-loop
  config:
    maxFindings: 30
    linters: [eslint, ruff]   # force; otherwise auto-detect

| Key | Default | Meaning | |---|---|---| | autoInject | true | Register the auto-injected findings section (and the fs/observed listener) | | maxFindings | 50 | Hard cap on findings surfaced by tools and the injected section (token-cost guard) | | linters | [] (auto) | Force which linters are usable (eslint / biome / ruff); unknown keys are warned | | linterPath | {} | Per-linter binary override ({eslint: …, biome: …, ruff: …}); a path ending in .js/.mjs/.cjs runs under the current Node | | sectionTtlMs | 30000 | How long an injected delta stays current (min 1000) | | sectionSeverity | error | Severity the injected section reports (error / warning / info) — warnings stay out of the prompt by default | | settleMs | 600 | Quiet period after the last edit before the section re-lints (min 100) | | timeoutMs | 10000 | Per-run linter process timeout (min 1000); a timed-out run is killed and reported | | gate | true | Completion gate: block turn-stopping while edited files still carry errors | | gateMaxSteers | 2 | Max forced continuations per turn before the gate admits the turn (min 0) | | gateSeverity | error | Severity the completion gate enforces | | codeFrames | true | Attach a source code frame to rendered findings | | frameLines | 1 | Lines of context above/below a framed finding | | frameLimit | 5 | Max findings that get a code frame (token guard) |

Supported linters

• eslint (--no-warn-ignored -f json): flat config and legacy .eslintrc; versions that reject --no-warn-ignored (< 8.22) fall back automatically, remembered per repo.
• biome (check --reporter=json): both the ≥ 2 reporter shape (1-based line/column, CLI-relative string path) and the legacy byte-offset span shape; format/organizeImports diffs are NOT findings.
• ruff (check --output-format=json): 1-based positions; fix present → fixable: true; every violation is an error (ruff has no severities).

Rust (clippy), Go (golangci-lint), and friends are deliberately deferred — linters.ts + parse.ts are the seams where further linters plug in (command, args, JSON shape, install hint).

How it works

• Detection (src/detect.ts): config-file probe per repo root, cached, invalidated when an observed event carries a linter config basename (biome.json, pyproject.toml, …). pyproject.toml counts as ruff only when it really contains [tool.ruff].
• Runner pool (src/runner.ts): one serial lane per (root, linter) — a save storm queues instead of stampeding; each run is a one-shot spawn with capped stdout/stderr, killed at timeoutMs (SIGTERM → SIGKILL grace).
• Findings store (src/manager.ts): per-root manager keeps the last lint result per file (512-file soft cap); lint_fix reads the file before and after the fix run, summarizes the line diff, and re-lints for the authoritative remaining set.
• Edit detection (src/section.ts): the fs/observed listener only queues the file (sync, never throws); a debounced (settleMs) refresh lints and diffs against the per-file previous state — only new/changed findings of the configured severity reach the prompt, capped to the top 5.
• Code frames (src/frames.ts): source lines are cached during a lint run and attached to the first frameLimit rendered findings, with the offending line marked █; the render path stays synchronous and degrades to no frame when the cache is cold (replay).
• Completion gate (src/gate.ts): files observed during the turn are re-linted at agent/turn-stopping; remaining errors trigger a bounded agent.steer (≤ gateMaxSteers per turn) that carries the findings.
• Workspace resolution: session cwd → walk up to the nearest .git (bounded), same as dsh-code-index. Files outside a repo are refused.
• Token-cost awareness: every surface — tool output and injected section — is capped by maxFindings (section: top 5); the injected view is a per-edit delta, not the workspace.

Relationship to dsh-lsp-diagnostics

The two plugins are complementary and coexist: dsh-lsp-diagnostics covers compiler/type errors via language servers (section order 70), this plugin covers style/lint findings via the repo's linters (order 75). No LSP is booted here and no linter is bundled there — clean separation, no overlap.

Known limitations

• lint_workspace_errors covers files linted this session (a file joins the set the first time lint_diagnostics checks it) — not a whole-repo batch scan.
• Biome's JSON reporter does not expose fixability — fixable is false for biome findings, but lint_fix still runs biome check --write and reports what actually changed.
• Ruff has no severities — all ruff findings surface as error.
• Auto-injection triggers on harness file events; direct out-of-band edits (the user editing files externally) are not observed until the tool is called.
• Linters must be installed (repo-local node_modules/.bin is resolved first, then PATH, then linterPath); nothing is bundled, by design.
• The completion gate is a bounded nudge, not a hard block: it forces at most gateMaxSteers continuations per turn, then admits the turn — it can never wedge a session.
• Developer-preview harness: expect breaking harness/plugin API changes upstream.

Development

pnpm install
pnpm test        # vitest — detection/routing/parsers/tools/fix/lifecycle against a marker-driven fake linter
pnpm typecheck
pnpm build       # tsup → dist/index.js (ESM, external deps)

# probe real linters in a real repo (any checkout with eslint/biome/ruff installed)
node scripts/probe-linter.mjs /path/to/repo src/someFile.ts

The suite runs against tests/helpers/fakeLinter.mjs — a marker-driven fake (// lint: <severity> <rule> <message>) that emits each REAL linter's JSON shape (eslint array, biome diagnostics with 1-based start/end or byte-offset spans, ruff array) and simulates auto-fix by stripping [fixable] marker comments — so no real linter is needed in CI. The real eslint 10 / biome 2.5 / ruff 0.16 output shapes were captured and regression-tested via scripts/probe-linter.mjs.

Feedback

• Questions, install help, usage → Discussions › Q&A
• Ideas, linter requests, loop workflow → Discussions › Ideas
• Setups & showcases → Discussions › Show and tell
• Reproducible bugs → open an issue

If dsh-lint-loop saves you a fix loop, a star helps other dsh users find it.

License

MIT. Not affiliated with DeepSeek; built on the public dsh plugin surface.