{"record":{"id":"d2e950786669f028","repo":"Hmbown/CodeWhale","slug":"no-pet-segment-was-prepared","errorCode":null,"errorMessage":"No pet segment was prepared.","messagePattern":"No pet segment was prepared\\.","errorType":"exception","errorClass":"Error","httpStatus":null,"severity":"error","filePath":"crates/tui/src/tui/pet_watch/pet-native.js","lineNumber":66,"sourceCode":"    }\n    /** Losing a producer invalidates outstanding coverage, never the creature. */\n    disconnectEngine() { this.engine = new pet_engine_js_1.PetEngineTelemetry(); this.world.voices = []; }\n    interact(kind, x, y) { this.world.interact(kind, x, y); }\n    interactions() { return JSON.stringify(this.world.interactions); }\n    accept(packet) { this.world.acceptTelemetry(JSON.parse(packet)); }\n    acceptLiveTail(text) {\n        const packet = this.liveTape.readTail(text);\n        if (!packet)\n            return false;\n        this.world.acceptTelemetry(packet);\n        return true;\n    }\n    resetLiveInput() { this.liveTape.reset(); return this.resumeEngine(); }\n    recording(withCheckpoint = false) { return JSON.stringify(this.world.recording(withCheckpoint)); }\n    needsSegment() { return this.world.needsSegment; }\n    prepareSegment() { this.segment = this.world.prepareSegment(); return JSON.stringify(this.segment.recording); }\n    commitSegment() { if (!this.segment)\n        throw new Error('No pet segment was prepared.'); this.segment.commit(); this.segment = undefined; }\n    checkpoint() { return JSON.stringify(this.world.checkpoint()); }\n    recordingChunk(index, completed = false) { return this.world.recordingChunk(index, completed); }\n    restoreCheckpoint(text) {\n        if (text.length > 512 * 1024)\n            throw new Error('Pet checkpoint exceeds its size limit.');\n        this.restoreRecording(JSON.stringify({ ...this.world.recording(false), checkpoint: JSON.parse(text) }));\n    }\n    restoreRecording(text) {\n        if (text.length > 8 * 1024 * 1024)\n            throw new Error('Native habitat exceeds 8 MiB.');\n        const points = this.world.sim.p.map(p => [p.hx, p.hy]);\n        this.world = pet_world_js_1.PetWorld.fromRecording(points, JSON.parse(text));\n        this.liveTape.reset();\n        this.segment = undefined;\n        this.engineTick = Math.round(this.world.frame.timeMs * 30 / 1000);\n        this.engine = new pet_engine_js_1.PetEngineTelemetry();\n    }\n    /** Resume a live host at the first unrecorded bucket. Keep every accepted","sourceCodeStart":48,"sourceCodeEnd":84,"githubUrl":"https://github.com/Hmbown/CodeWhale/blob/73e0f67d83c59909b571efdfc88c4bc28c309cb1/crates/tui/src/tui/pet_watch/pet-native.js#L48-L84","documentation":"The `browser` tool's `start` action accepts an optional `url`, which must be a string when present. Since the URL is optional (null/undefined is allowed), only a present-but-wrong-type value — number, object, boolean, etc. — throws this error.","triggerScenarios":"resolveTool(\"browser\", {action:\"start\", url: 8080}) or url: {host:\"example.com\"} or url: true — any non-null, non-string url passed to browser start.","commonSituations":"Passing a port number instead of a URL string; building args programmatically and assigning an object; a model emitting url as a structured {protocol,host} object; config where url comes from a numeric env var.","solutions":["Pass the url as a string, e.g. \"https://example.com\", or omit it to start with the default page.","Coerce values with String(url) only if you are sure the value is URL-like; otherwise fix the source of the value.","If the value came from parsed config/CLI input, validate it is typeof string before calling."],"exampleFix":"// before\nresolveTool(\"browser\", { action: \"start\", url: 8080 });\n// after\nresolveTool(\"browser\", { action: \"start\", url: \"http://localhost:8080\" });","handlingStrategy":"type-guard","validationCode":"if (args.url != null && typeof args.url !== \"string\") {\n  throw new Error(\"browser start url must be a string when provided\");\n}","typeGuard":"const hasValidStartUrl = (a) => a.url == null || typeof a.url === \"string\";","tryCatchPattern":null,"preventionTips":["Always pass full URL strings (include scheme), never ports or host objects.","Validate config-derived values are strings before placing them in tool args.","Constrain model-generated args with a JSON schema that types url as string."],"tags":["argument-validation","type-check","browser-automation"],"backgroundTag":"type-mismatch","analyzedSha":"73e0f67d83c59909b571efdfc88c4bc28c309cb1","analyzedAt":"2026-09-22T01:30:00.501Z","contentChangedAt":"2026-09-22T01:30:00.501Z","schemaVersion":2},"datasetVersion":"2026-09-23T08:17:48.524Z"}