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* feat(spec): add llm() action-backend marker * feat(spec): make llm marker inert on the JS picker * feat(spec): expose __sanderlingSampleInput__ corpus draw * feat(openrouter): minimal chat-completions client * test(openrouter): cover request shape, parse, and errors * feat(verifier): thread screenshot + capture corpus sampler * feat(verifier): LLM accessors — candidates, config, sampler * test(verifier): cover AllCandidates, LLMConfig, SampleInput * feat(trace): record action Source and LLMReasoning * feat(runner): thread step screenshot into PushSnapshot * feat(runner): llmSource selects actions via OpenRouter * feat(runner): wire llmSource selection and trace stamping * test(runner): cover llmSource selection, mapping, downscale * docs(folio): add llm action-backend example spec * docs(folio): document the LLM action backend run * feat(llmclient): support OPENAI_API_KEY, openrouter wins * refactor(runner): rename openrouter package to llmclient * docs: both api keys, example model gpt-5.4-nano * docs: add pr style rules to claude.md * fix(runner): explain action kinds in llm prompt to stop swipe loops * feat(trace): record llm ranked list and chosen rank * feat(runner): stamp llm ranked list and chosen rank on trace * fix(runner): tap by selector to survive layout shift after observe * revert(runner): drop selector-first tap; broke path/testTag selectors * feat(spec): llm() accepts optional instructions * feat(verifier): read llm instructions off config * feat(runner): append spec instructions to llm system prompt * docs(folio): describe app in llm spec instructions * feat(bundler): map generator export to globalThis.generator * feat(verifier): read llm config off globalThis.generator * feat(runner): gate llm source on --generator flag * feat(cmd): add --generator llm|seeded flag * test: cover --generator flag parsing and pickSources gating * feat(verifier): enumerate llm candidates by walking actionsRoot collect-walk the weighted action tree: recurse weighted branches accumulating selection probability, call authored leaves once for concrete actions, enumerate builtins per element. label controls by visible text (borrowing descendant text), fold gestures into directional scrolls over scrollable containers, drop disabled, dedup descriptions. * test(verifier): cover candidate enumeration walk * feat(verifier): add SetupAction to walk setup without the seeded root * test(verifier): cover SetupAction setup-only precedence * refactor(llmclient): make JSONSchema.Schema raw json for pinned field order * feat(trace): record llm choice number and chosen_action echo * feat(runner): llm picks one number from weighted candidates drop the seeded-root call for a setup-only precedence path, render a numbered weighted candidate list, pin a reasoning-first choice schema, strict-skip when chosen_action does not echo the numbered entry, and let the model supply typed values (corpus fallback when empty). * test(runner): cover choice schema, strict-skip, and setup precedence * refactor(verifier): drop the superseded AllCandidates enumeration * feat(folio): drive spec.ts under --generator llm; drop spec-llm.ts * fix(verifier): label editable fields by hint, not the typed value an editable field's own text is its transient content; prefer the hint so the field is named by purpose and the label stays stable. * test(runner): cover weight-suffixed echo and stripWeightSuffix * fix(runner): accept chosen_action echo that carries the weight suffix real runs showed the model copies the whole numbered line including the trailing (w34) weight annotation, so strict-skip rejected ~91% of picks and the llm was paralyzed. strip the weight suffix before comparing. also nudge the prompt to stress-test repeated submissions (idempotency). * fix(verifier): skip llm enumeration on cross-fade frames a navhost mid-transition carries >1 route *Screen in a collapsed coordinate space; acting on it taps garbage (soft keyboard). real runs showed the llm acting on 44% of steps being such frames. skip them so the llm re-observes a settled frame next step. * feat(folio): show current balance on the add-transaction screen renders the account's balance (testTag TxnCurrentBalance) below the account name, above the credit/debit toggle, so before/after screenshots carry comparison data. * fix(replay): derive device space from screen extent, not first node the first positive-bounds element is often a short status-bar node (320x24 on android); using it gave a 320/24 aspect ratio that squashed the screenshot overlay into a grey horizontal band. use the max extent across elements (like the runner's screenBounds) instead. * fix(folio): show balance as a compact one-line label per review: one line, account-name-sized, e.g. "Balance: $0.00" instead of a large balance card. * fix(folio): move balance into the header, one compact line under the account name * fix(replay): attribute deferred violations to the causing step, not detection * fix(replay): show a step's own violations in both panels, no next-step bleed * refactor(hierarchy): one Tree.Transitional, drop the duplicated cross-fade check * chore: ignore .playwright-mcp scratch output * docs: document the llm generator and --generator flag * docs(spec): correct the llm() comment; config reads off globalThis.generator * docs: add pr description rules
sanderling
Autonomous property-based testing for mobile and web apps.
You write rules that must always hold about your app. sanderling explores the app on its own for minutes or hours, performing thousands of taps, swipes, and inputs, and records every step where a rule breaks. No scripted test paths. One TypeScript spec runs against Android, iOS, and web builds of the same app.
import { extract, always } from "@sanderling/spec";
import { defaultActions } from "@sanderling/spec/defaults";
import { noUncaughtExceptions } from "@sanderling/spec/defaults/properties";
const balance = extract("balance", s =>
parseInt(s.ax.find({ testTag: "Balance" })?.text ?? "0", 10));
export const properties = {
noUncaughtExceptions,
balanceNeverNegative: always(() => balance.current >= 0),
};
export const actionsRoot = defaultActions;
Every run produces a trace: one JSON line and one screenshot per step. sanderling replay opens it in a web UI for stepping through actions, screenshots, property timelines, and violations.
Alpha. Android, iOS, and web (Chrome driver only). Full scope in the v0.1.0 roadmap.
Docs
- Introduction: what property-based testing is and how sanderling works
- Case study: Folio: sanderling finding a real bug in a mobile app
- Getting started: install the CLI and run it against Folio
- Spec language reference
- Examples: folio (KMP, Android/iOS/web), folio-web (React + Vite)
- Architecture for contributors
sanderling, a wading bird that probes the shoreline for bugs that lie beneath.