diff --git a/scripts/src/cli-child-json-recovery.test.ts b/scripts/src/cli-child-json-recovery.test.ts
new file mode 100644
index 00000000..d3d0bb83
--- /dev/null
+++ b/scripts/src/cli-child-json-recovery.test.ts
@@ -0,0 +1,152 @@
+import assert from "node:assert/strict";
+import { mkdtemp, writeFile } from "node:fs/promises";
+import { tmpdir } from "node:os";
+import { join } from "node:path";
+import { test } from "bun:test";
+
+import { resolveCliChildJsonObject } from "./cli-child-json-recovery";
+
+test("child JSON recovery reads full JSON from CLI stdout dump wrapper", async () => {
+  const dir = await mkdtemp(join(tmpdir(), "unidesk-cli-child-json-dump-"));
+  const dumpPath = join(dir, "dump.json");
+  await writeFile(dumpPath, JSON.stringify({ ok: true, data: { contract: "full-json" } }) + "\n");
+
+  const wrapper = {
+    ok: true,
+    command: "fixture",
+    data: {
+      outputTruncated: true,
+      reason: "stdout-json-bytes-exceeded-threshold",
+      dump: { path: dumpPath },
+    },
+  };
+  const resolved = resolveCliChildJsonObject({
+    stdout: JSON.stringify(wrapper),
+    requestedStdoutType: "fixture JSON",
+  });
+
+  assert.equal(resolved.source, "dump");
+  assert.equal(resolved.parsed?.ok, true);
+  assert.deepEqual(resolved.parsed?.data, { contract: "full-json" });
+  assert.equal(resolved.diagnostics.stdoutKind, "dump-wrapper");
+  assert.equal(resolved.diagnostics.dumpPath, dumpPath);
+  assert.equal(resolved.diagnostics.dumpReadOk, true);
+  assert.equal(resolved.diagnostics.dumpJsonOk, true);
+});
+
+test("child JSON recovery falls back to artifact after trans truncation summary", () => {
+  const summary = {
+    code: "ssh-truncation-summary",
+    exitCode: 0,
+    timedOut: false,
+    stdout: {
+      stream: "stdout",
+      thresholdBytes: 10240,
+      observedBytesAtTruncation: 165000,
+      forwardedBytes: 10240,
+      dumpPath: null,
+      dumpError: null,
+    },
+  };
+  const resolved = resolveCliChildJsonObject({
+    stdout: `UNIDESK_SSH_TRUNCATION_SUMMARY ${JSON.stringify(summary)}\n`,
+    requestedStdoutType: "web-probe observe analyze compact JSON",
+    artifactFallback: {
+      path: "analysis/report.json",
+      nextCommand: "bun scripts/cli.ts web-probe observe collect webobs-fixture --view files --file analysis/report.json",
+      read: () => ({ ok: true, value: { ok: true, reportJsonPath: "analysis/report.json" }, reason: "analysis-artifact-contract" }),
+    },
+  });
+
+  assert.equal(resolved.source, "artifact");
+  assert.equal(resolved.parsed?.ok, true);
+  assert.equal(resolved.diagnostics.stdoutKind, "ssh-truncation-summary");
+  assert.equal(resolved.diagnostics.fallbackReason, "stdout-trans-truncated");
+  const artifact = resolved.diagnostics.artifact as Record<string, unknown>;
+  assert.equal(artifact.ok, true);
+  assert.equal(artifact.nextCommand, "bun scripts/cli.ts web-probe observe collect webobs-fixture --view files --file analysis/report.json");
+});
+
+test("child JSON recovery falls back to artifact when stdout is not JSON", () => {
+  const resolved = resolveCliChildJsonObject({
+    stdout: "remote helper wrote a bounded text summary instead of JSON",
+    requestedStdoutType: "web-probe observe analyze compact JSON",
+    artifactFallback: {
+      path: "analysis/report.json",
+      nextCommand: "collect report",
+      read: () => ({ ok: true, value: { ok: true, counts: { network: 9 }, reportJsonPath: "analysis/report.json" } }),
+    },
+  });
+
+  assert.equal(resolved.source, "artifact");
+  assert.equal(resolved.parsed?.ok, true);
+  assert.deepEqual(resolved.parsed?.counts, { network: 9 });
+  assert.equal(resolved.diagnostics.stdoutKind, "non-json");
+  assert.equal(resolved.diagnostics.fallbackReason, "stdout-not-json");
+});
+
+test("child JSON recovery rejects ok-only stdout contract and uses artifact", () => {
+  const resolved = resolveCliChildJsonObject({
+    stdout: JSON.stringify({ ok: true }),
+    requestedStdoutType: "web-probe observe analyze compact JSON",
+    acceptParsed: (value) => typeof value.reportJsonPath === "string" || typeof value.counts === "object",
+    artifactFallback: {
+      path: "analysis/report.json",
+      nextCommand: "collect report",
+      read: () => ({ ok: true, value: { ok: true, reportJsonPath: "analysis/report.json", counts: { network: 9 } } }),
+    },
+  });
+
+  assert.equal(resolved.source, "artifact");
+  assert.equal(resolved.parsed?.reportJsonPath, "analysis/report.json");
+  assert.deepEqual(resolved.parsed?.counts, { network: 9 });
+  assert.equal(resolved.diagnostics.stdoutKind, "json");
+  assert.equal(resolved.diagnostics.fallbackReason, "stdout-json-contract-invalid");
+  assert.equal(resolved.diagnostics.stdoutContractAccepted, false);
+});
+
+test("child JSON recovery drops invalid ok-only stdout when artifact fallback is missing", () => {
+  const resolved = resolveCliChildJsonObject({
+    stdout: JSON.stringify({ ok: true }),
+    requestedStdoutType: "web-probe observe analyze compact JSON",
+    acceptParsed: (value) => typeof value.reportJsonPath === "string" || typeof value.counts === "object",
+    artifactFallback: {
+      path: "analysis/report.json",
+      nextCommand: "collect report",
+      read: () => ({ ok: false, reason: "artifact-missing", path: "analysis/report.json" }),
+    },
+  });
+
+  assert.equal(resolved.parsed, null);
+  assert.equal(resolved.source, null);
+  assert.equal(resolved.diagnostics.stdoutKind, "json");
+  assert.equal(resolved.diagnostics.fallbackReason, "stdout-json-contract-invalid");
+  assert.equal(resolved.diagnostics.stdoutContractAccepted, false);
+  const artifact = resolved.diagnostics.artifact as Record<string, unknown>;
+  assert.equal(artifact.ok, false);
+  assert.equal(artifact.reason, "artifact-missing");
+  assert.equal(artifact.path, "analysis/report.json");
+  assert.equal(artifact.nextCommand, "collect report");
+});
+
+test("child JSON recovery reports artifact fallback failure when stdout is unusable and artifact is missing", () => {
+  const resolved = resolveCliChildJsonObject({
+    stdout: "not json",
+    requestedStdoutType: "web-probe observe analyze compact JSON",
+    artifactFallback: {
+      path: "analysis/report.json",
+      nextCommand: "collect report",
+      read: () => ({ ok: false, reason: "artifact-missing", path: "analysis/report.json" }),
+    },
+  });
+
+  assert.equal(resolved.parsed, null);
+  assert.equal(resolved.source, null);
+  assert.equal(resolved.diagnostics.stdoutKind, "non-json");
+  assert.equal(resolved.diagnostics.fallbackReason, "stdout-not-json");
+  const artifact = resolved.diagnostics.artifact as Record<string, unknown>;
+  assert.equal(artifact.ok, false);
+  assert.equal(artifact.reason, "artifact-missing");
+  assert.equal(artifact.path, "analysis/report.json");
+  assert.equal(artifact.nextCommand, "collect report");
+});
diff --git a/scripts/src/cli-child-json-recovery.ts b/scripts/src/cli-child-json-recovery.ts
new file mode 100644
index 00000000..9a750206
--- /dev/null
+++ b/scripts/src/cli-child-json-recovery.ts
@@ -0,0 +1,264 @@
+import { existsSync, readFileSync } from "node:fs";
+
+export type CliChildJsonStdoutKind = "json" | "empty" | "dump-wrapper" | "ssh-stdout-truncated" | "ssh-truncation-summary" | "non-json";
+export type CliChildJsonSource = "stdout" | "dump" | "artifact" | null;
+
+export interface CliChildJsonArtifactFallback {
+  path: string | null;
+  nextCommand: string | null;
+  read: () => CliChildJsonArtifactReadResult;
+}
+
+export type CliChildJsonArtifactReadResult =
+  | { ok: true; value: Record<string, unknown>; path?: string | null; reason?: string | null }
+  | { ok: false; reason: string; path?: string | null; error?: string | null };
+
+export interface CliChildJsonResolution {
+  parsed: Record<string, unknown> | null;
+  source: CliChildJsonSource;
+  diagnostics: Record<string, unknown>;
+}
+
+export function resolveCliChildJsonObject(options: {
+  stdout: string;
+  stderr?: string;
+  requestedStdoutType: string;
+  acceptParsed?: (value: Record<string, unknown>) => boolean;
+  artifactFallback?: CliChildJsonArtifactFallback | null;
+  forceArtifactFallbackReason?: string | null;
+}): CliChildJsonResolution {
+  const stderr = options.stderr ?? "";
+  const parsedStdout = parseStdoutCandidate(options.stdout, stderr);
+  const accepted = parsedStdout.parsed !== null && (options.acceptParsed?.(parsedStdout.parsed) ?? true);
+  const contractFallbackReason = parsedStdout.parsed !== null && !accepted ? "stdout-json-contract-invalid" : null;
+  const fallbackReason = options.forceArtifactFallbackReason
+    ?? contractFallbackReason
+    ?? (parsedStdout.parsed === null ? fallbackReasonForStdout(parsedStdout.stdoutKind) : null);
+
+  let parsed = contractFallbackReason === null ? parsedStdout.parsed : null;
+  let source: CliChildJsonSource = contractFallbackReason === null ? parsedStdout.source : null;
+  let artifactDiagnostics: Record<string, unknown> | null = null;
+  if (fallbackReason !== null && options.artifactFallback) {
+    const artifact = options.artifactFallback.read();
+    artifactDiagnostics = {
+      path: artifact.path ?? options.artifactFallback.path,
+      requestedPath: options.artifactFallback.path,
+      nextCommand: options.artifactFallback.nextCommand,
+      ok: artifact.ok,
+      reason: artifact.ok ? artifact.reason ?? fallbackReason : artifact.reason,
+      error: artifact.ok ? null : artifact.error ?? null,
+      valuesRedacted: true,
+    };
+    if (artifact.ok) {
+      parsed = artifact.value;
+      source = "artifact";
+    }
+  }
+
+  return {
+    parsed,
+    source,
+    diagnostics: {
+      requestedStdoutType: options.requestedStdoutType,
+      stdoutKind: parsedStdout.stdoutKind,
+      source,
+      fallbackReason,
+      parsedFromStdout: parsedStdout.source === "stdout",
+      parsedFromDump: parsedStdout.source === "dump",
+      stdoutContractAccepted: accepted,
+      dumpPath: parsedStdout.dumpPath,
+      dumpReason: parsedStdout.dumpReason,
+      dumpReadOk: parsedStdout.dumpReadOk,
+      dumpJsonOk: parsedStdout.dumpJsonOk,
+      sshTruncation: parsedStdout.sshTruncation,
+      artifact: artifactDiagnostics,
+      valuesRedacted: true,
+    },
+  };
+}
+
+function parseStdoutCandidate(stdout: string, stderr: string): {
+  parsed: Record<string, unknown> | null;
+  source: CliChildJsonSource;
+  stdoutKind: CliChildJsonStdoutKind;
+  dumpPath: string | null;
+  dumpReason: string | null;
+  dumpReadOk: boolean | null;
+  dumpJsonOk: boolean | null;
+  sshTruncation: Record<string, unknown> | null;
+} {
+  const trimmed = stdout.trim();
+  const sshTruncation = parseSshTruncation(stdout, stderr);
+  if (trimmed.length === 0) {
+    return emptyCandidate("empty", sshTruncation);
+  }
+  if (trimmed.startsWith("UNIDESK_SSH_STDOUT_TRUNCATED ")) {
+    const dumpPath = stringValue(parseMarkerJson(trimmed, "UNIDESK_SSH_STDOUT_TRUNCATED "), "dumpPath");
+    return dumpPath ? parseDumpCandidate("ssh-stdout-truncated", dumpPath, "ssh-stdout-truncated", sshTruncation) : emptyCandidate("ssh-stdout-truncated", sshTruncation);
+  }
+  if (trimmed.startsWith("UNIDESK_SSH_TRUNCATION_SUMMARY ")) {
+    const dumpPath = stdoutDumpPathFromSshSummary(parseMarkerJson(trimmed, "UNIDESK_SSH_TRUNCATION_SUMMARY "));
+    return dumpPath ? parseDumpCandidate("ssh-truncation-summary", dumpPath, "ssh-truncation-summary", sshTruncation) : emptyCandidate("ssh-truncation-summary", sshTruncation);
+  }
+
+  const parsed = parseJsonObject(trimmed);
+  if (parsed !== null) {
+    const dumpPayload = cliDumpPayload(parsed);
+    if (dumpPayload !== null) {
+      return parseDumpCandidate("dump-wrapper", dumpPayload.path, dumpPayload.reason, sshTruncation);
+    }
+    return {
+      parsed,
+      source: "stdout",
+      stdoutKind: "json",
+      dumpPath: null,
+      dumpReason: null,
+      dumpReadOk: null,
+      dumpJsonOk: null,
+      sshTruncation,
+    };
+  }
+
+  const summaryDumpPath = stdoutDumpPathFromSshSummary(sshTruncation);
+  if (summaryDumpPath !== null) {
+    return parseDumpCandidate("ssh-truncation-summary", summaryDumpPath, "ssh-truncation-summary", sshTruncation);
+  }
+  return emptyCandidate("non-json", sshTruncation);
+}
+
+function parseDumpCandidate(stdoutKind: CliChildJsonStdoutKind, dumpPath: string, reason: string | null, sshTruncation: Record<string, unknown> | null): {
+  parsed: Record<string, unknown> | null;
+  source: CliChildJsonSource;
+  stdoutKind: CliChildJsonStdoutKind;
+  dumpPath: string | null;
+  dumpReason: string | null;
+  dumpReadOk: boolean | null;
+  dumpJsonOk: boolean | null;
+  sshTruncation: Record<string, unknown> | null;
+} {
+  if (!existsSync(dumpPath)) {
+    return {
+      ...emptyCandidate(stdoutKind, sshTruncation),
+      dumpPath,
+      dumpReason: reason,
+      dumpReadOk: false,
+      dumpJsonOk: null,
+    };
+  }
+  const parsed = parseJsonObject(readFileSync(dumpPath, "utf8"));
+  return {
+    parsed,
+    source: parsed === null ? null : "dump",
+    stdoutKind,
+    dumpPath,
+    dumpReason: reason,
+    dumpReadOk: true,
+    dumpJsonOk: parsed !== null,
+    sshTruncation,
+  };
+}
+
+function emptyCandidate(stdoutKind: CliChildJsonStdoutKind, sshTruncation: Record<string, unknown> | null) {
+  return {
+    parsed: null,
+    source: null,
+    stdoutKind,
+    dumpPath: null,
+    dumpReason: null,
+    dumpReadOk: null,
+    dumpJsonOk: null,
+    sshTruncation,
+  };
+}
+
+function fallbackReasonForStdout(kind: CliChildJsonStdoutKind): string {
+  if (kind === "empty") return "stdout-empty";
+  if (kind === "dump-wrapper") return "stdout-dump-wrapper-unreadable";
+  if (kind === "ssh-stdout-truncated") return "stdout-ssh-truncated";
+  if (kind === "ssh-truncation-summary") return "stdout-trans-truncated";
+  return "stdout-not-json";
+}
+
+function cliDumpPayload(parsed: Record<string, unknown>): { path: string; reason: string | null } | null {
+  for (const candidate of [parsed, record(parsed.data), record(parsed.error)]) {
+    if (candidate.outputTruncated !== true) continue;
+    const path = stringValue(record(candidate.dump), "path");
+    if (path !== null) return { path, reason: stringValue(candidate, "reason") };
+  }
+  return null;
+}
+
+function parseSshTruncation(stdout: string, stderr: string): Record<string, unknown> | null {
+  const text = `${stdout}\n${stderr}`;
+  const markers = ["UNIDESK_SSH_TRUNCATION_SUMMARY ", "UNIDESK_SSH_STDOUT_TRUNCATED "];
+  for (const marker of markers) {
+    const lines = text.split(/\r?\n/u).filter((line) => line.trim().startsWith(marker));
+    const last = lines.at(-1)?.trim();
+    const parsed = last ? parseMarkerJson(last, marker) : null;
+    if (parsed !== null) return parsed;
+  }
+  return null;
+}
+
+function parseMarkerJson(line: string, marker: string): Record<string, unknown> | null {
+  if (!line.startsWith(marker)) return null;
+  return parseJsonObject(line.slice(marker.length));
+}
+
+function stdoutDumpPathFromSshSummary(value: Record<string, unknown> | null): string | null {
+  const root = record(value);
+  const stdout = record(root.stdout);
+  return stringValue(stdout, "dumpPath") ?? stringValue(root, "dumpPath");
+}
+
+function parseJsonObject(text: string): Record<string, unknown> | null {
+  const trimmed = text.trim();
+  if (trimmed.length === 0) return null;
+  try {
+    return record(JSON.parse(trimmed) as unknown);
+  } catch {
+    const objectText = firstJsonObjectText(trimmed);
+    if (objectText === null) return null;
+    try {
+      return record(JSON.parse(objectText) as unknown);
+    } catch {
+      return null;
+    }
+  }
+}
+
+function firstJsonObjectText(text: string): string | null {
+  const start = text.indexOf("{");
+  if (start < 0) return null;
+  let depth = 0;
+  let inString = false;
+  let escaped = false;
+  for (let index = start; index < text.length; index += 1) {
+    const char = text[index];
+    if (inString) {
+      if (escaped) escaped = false;
+      else if (char === "\\") escaped = true;
+      else if (char === "\"") inString = false;
+      continue;
+    }
+    if (char === "\"") {
+      inString = true;
+      continue;
+    }
+    if (char === "{") depth += 1;
+    else if (char === "}") {
+      depth -= 1;
+      if (depth === 0) return text.slice(start, index + 1);
+    }
+  }
+  return null;
+}
+
+function record(value: unknown): Record<string, unknown> {
+  return value !== null && typeof value === "object" && !Array.isArray(value) ? value as Record<string, unknown> : {};
+}
+
+function stringValue(value: Record<string, unknown>, key: string): string | null {
+  const item = value[key];
+  return typeof item === "string" && item.length > 0 ? item : null;
+}
diff --git a/scripts/src/hwlab-node/web-probe-observe.ts b/scripts/src/hwlab-node/web-probe-observe.ts
index fd273a0d..ff8c17cb 100644
--- a/scripts/src/hwlab-node/web-probe-observe.ts
+++ b/scripts/src/hwlab-node/web-probe-observe.ts
@@ -11,6 +11,7 @@ import { existsSync, mkdirSync, readFileSync, renameSync, writeFileSync } from "
 import { dirname, join } from "node:path";
 import { repoRoot, rootPath, type Config } from "../config";
 import { runCommand, type CommandResult } from "../command";
+import { resolveCliChildJsonObject } from "../cli-child-json-recovery";
 import { startJob } from "../jobs";
 import { classifySshTcpPoolFailure } from "../ssh";
 import { HWLAB_NODE_CONTROL_PLANE_CONFIG_PATH, hwlabNodeControlPlaneInfraHelp, runHwlabNodeControlPlaneInfra } from "../hwlab-node-control-plane";
@@ -2493,20 +2494,48 @@ export function runNodeWebProbeObserveAnalyze(options: NodeWebProbeObserveOption
     "exit \"$analyzer_exit\"",
   ].join("\n");
   const result = runTransWorkspaceStdinScript(options.node, spec.workspace, script, options.commandTimeoutSeconds);
-  const primaryAnalysis = recoverWebObserveAnalyzeTurnDetails(options, spec, parseJsonObject(result.stdout));
-  const artifactAnalysis = (result.timedOut || result.exitCode !== 0 || primaryAnalysis === null)
-    ? recoverWebObserveAnalyzeFromArtifacts(options, spec, result)
-    : null;
-  const analysis = recoverWebObserveAnalyzeTurnDetails(options, spec, artifactAnalysis ?? primaryAnalysis);
+  const analysisArtifactDir = options.stateDir ? join(options.stateDir, "analysis") : "";
+  const reportJsonPath = analysisArtifactDir ? join(analysisArtifactDir, "report.json") : null;
+  const collectReportCommand = webObserveAnalyzeCollectCommand(options, "analysis/report.json");
+  const stdoutResolution = resolveCliChildJsonObject({
+    stdout: result.stdout,
+    stderr: result.stderr,
+    requestedStdoutType: "web-probe observe analyze compact JSON",
+    acceptParsed: isWebObserveAnalyzeJsonContract,
+    forceArtifactFallbackReason: result.timedOut ? "remote-command-timeout" : result.exitCode !== 0 ? "remote-command-failed" : null,
+    artifactFallback: {
+      path: reportJsonPath,
+      nextCommand: collectReportCommand,
+      read: () => {
+        const recovered = recoverWebObserveAnalyzeFromArtifacts(options, spec, result);
+        if (recovered !== null) {
+          return {
+            ok: true,
+            value: recovered,
+            path: stringOrNullValue(recordValue(recovered).reportJsonPath) ?? reportJsonPath,
+            reason: "analysis-artifact-contract",
+          };
+        }
+        return { ok: false, reason: "analysis-artifact-missing-or-invalid", path: reportJsonPath };
+      },
+    },
+  });
+  const artifactAnalysis = stdoutResolution.source === "artifact" ? stdoutResolution.parsed : null;
+  const analysis = recoverWebObserveAnalyzeTurnDetails(options, spec, stdoutResolution.parsed);
   const analysisOk = analysis?.ok === true;
+  const stdoutDiagnostics = stdoutResolution.diagnostics;
+  const failureReason = analysis === null
+    ? stringOrNullValue(recordValue(stdoutDiagnostics).fallbackReason) ?? "analyzer-output-not-json"
+    : "analyzer-reported-not-ok";
   const analysisFailure = analysisOk
     ? null
     : {
-      reason: analysis === null ? "analyzer-output-not-json" : "analyzer-reported-not-ok",
+      reason: failureReason,
       exitCode: result.exitCode,
       timedOut: result.timedOut,
       parsedJson: analysis !== null,
       recoveredFromArtifacts: artifactAnalysis !== null,
+      stdoutRecovery: stdoutDiagnostics,
       stdoutBytes: result.stdout.length,
       stderrBytes: result.stderr.length,
       stdoutTail: result.stdout.trim().slice(-1200),
@@ -2515,12 +2544,11 @@ export function runNodeWebProbeObserveAnalyze(options: NodeWebProbeObserveOption
       observerId: webObserveIdFromOptions(options),
       valuesRedacted: true,
     };
-  const analysisArtifactDir = options.stateDir ? join(options.stateDir, "analysis") : "";
   const failureAnalysis = analysis ?? (analysisFailure ? {
     ok: false,
     command: "web-probe-observe analyze",
     stateDir: options.stateDir,
-    reportJsonPath: analysisArtifactDir ? join(analysisArtifactDir, "report.json") : null,
+    reportJsonPath,
     reportMdPath: analysisArtifactDir ? join(analysisArtifactDir, "report.md") : null,
     analyzer: {
       exitCode: result.exitCode,
@@ -2532,6 +2560,7 @@ export function runNodeWebProbeObserveAnalyze(options: NodeWebProbeObserveOption
       stdoutTail: result.stdout.trim().slice(-1200),
       stderrTail: result.stderr.trim().slice(-1200),
       recoveredFrom: "analyzer-timeout-failure-contract",
+      stdoutRecovery: stdoutDiagnostics,
       valuesRedacted: true,
     },
     findings: [{
@@ -2543,12 +2572,15 @@ export function runNodeWebProbeObserveAnalyze(options: NodeWebProbeObserveOption
         : "observe analyze failed before producing a compact report; inspect analyzer stdout/stderr artifacts under the observer analysis directory",
     }],
     next: {
-      collectAnalyzerStdout: options.stateDir ? `bun scripts/cli.ts web-probe observe collect --node ${options.node} --lane ${options.lane} --state-dir ${options.stateDir} --file analysis/analyzer-stdout.json` : null,
-      collectAnalyzerStderr: options.stateDir ? `bun scripts/cli.ts web-probe observe collect --node ${options.node} --lane ${options.lane} --state-dir ${options.stateDir} --file analysis/analyzer-stderr.log` : null,
+      collectReportJson: collectReportCommand,
+      collectAnalyzerStdout: webObserveAnalyzeCollectCommand(options, "analysis/analyzer-stdout.json"),
+      collectAnalyzerStderr: webObserveAnalyzeCollectCommand(options, "analysis/analyzer-stderr.log"),
       valuesRedacted: true,
     },
     valuesRedacted: true,
   } : null);
+  const compactResult = analysis === null ? compactCommandResultWithStdoutTail(result) : compactCommandResult(result);
+  compactResult.stdoutRecovery = stdoutDiagnostics;
   const payload = {
     ok: analysisOk,
     status: analysisOk ? "analyzed" : "blocked",
@@ -2562,13 +2594,39 @@ export function runNodeWebProbeObserveAnalyze(options: NodeWebProbeObserveOption
     alertThresholds,
     browserFreezePolicy,
     wrapper: buildWebObserveWrapperForObserveOptions("analyze", options, spec.workspace),
-    result: analysis === null ? compactCommandResultWithStdoutTail(result) : compactCommandResult(result),
+    result: compactResult,
     full: options.full,
     valuesRedacted: true,
   };
   return options.raw ? compactWebObserveAnalyzePayloadForRaw(payload, options.compactRaw) : withWebObserveAnalyzeRendered(payload);
 }
 
+function webObserveAnalyzeCollectCommand(options: NodeWebProbeObserveOptions, file: string): string {
+  const selector = options.stateDir ? `--state-dir ${shellQuote(options.stateDir)}` : webObserveIdFromOptions(options);
+  return `bun scripts/cli.ts web-probe observe collect ${selector} --node ${options.node} --lane ${options.lane} --view files --file ${shellQuote(file)}`;
+}
+
+function isWebObserveAnalyzeJsonContract(value: Record<string, unknown>): boolean {
+  const hasReportPath = typeof value.reportJsonPath === "string" || typeof value.reportMdPath === "string";
+  const hasAnalyzer = Object.keys(recordValue(value.analyzer)).length > 0;
+  const hasFindings = arrayRecordsValue(value.findings).length > 0 || arrayRecordsValue(value.archiveRedFindings).length > 0;
+  const hasAnalyzeData = hasReportPath
+    || hasAnalyzer
+    || hasFindings
+    || Object.keys(recordValue(value.counts)).length > 0
+    || Object.keys(recordValue(value.sampleMetrics)).length > 0
+    || Object.keys(recordValue(value.requestRate)).length > 0
+    || Object.keys(recordValue(value.requestRateCurve)).length > 0
+    || Object.keys(recordValue(value.frontendPerformance)).length > 0
+    || Object.keys(recordValue(value.webPerformanceRuntimeDiagnostics)).length > 0
+    || Object.keys(recordValue(value.runtimeAlerts)).length > 0
+    || Object.keys(recordValue(value.archiveSummary)).length > 0
+    || Object.keys(recordValue(value.analysisWindow)).length > 0;
+  const hasFailureData = typeof value.error === "string" || hasAnalyzer || hasFindings || hasReportPath;
+  if (value.ok === false) return hasFailureData;
+  return hasAnalyzeData;
+}
+
 function compactWebObserveAnalyzePayloadForRaw(payload: Record<string, unknown>, compactRaw: boolean): Record<string, unknown> {
   if (!compactRaw) return payload;
   const analysis = payload.analysis && typeof payload.analysis === "object" && !Array.isArray(payload.analysis)