diff --git a/.changeset/daring-badgers-munch.md b/.changeset/daring-badgers-munch.md
new file mode 100644
index 000000000..47c3505aa
--- /dev/null
+++ b/.changeset/daring-badgers-munch.md
@@ -0,0 +1,5 @@
+---
+type: Added
+pr: 3464
+---
+Add review.default_reviewers config support so no-flag /gsd-review runs a configured default subset with explicit-flags and --all precedence preserved.
diff --git a/docs/COMMANDS.md b/docs/COMMANDS.md
index 222e42f64..d81ade661 100644
--- a/docs/COMMANDS.md
+++ b/docs/COMMANDS.md
@@ -1177,13 +1177,27 @@ Cross-AI peer review of phase plans from external AI CLIs.
 | `--opencode` | Include OpenCode review (via GitHub Copilot) |
 | `--qwen` | Include Qwen Code review (Alibaba Qwen models) |
 | `--cursor` | Include Cursor agent review |
-| `--all` | Include all available CLIs |
+| `--ollama` | Include Ollama server review |
+| `--lm-studio` | Include LM Studio server review |
+| `--llama-cpp` | Include llama.cpp server review |
+| `--all` | Include all available reviewers (CLI + local model servers) |
+
+**Default reviewer behavior (no flags):**
+- If `review.default_reviewers` is **unset**, `/gsd-review` runs all detected reviewers (current default behavior).
+- If `review.default_reviewers` is **set**, `/gsd-review` runs only that subset (for example `["gemini","codex"]`).
+- `--all` always overrides config and runs the full detected set.
+- Explicit flags (for example `--cursor`) override both `--all` and config defaults for that run.
 
 **Produces:** `{phase}-REVIEWS.md` — consumable by `/gsd-plan-phase --reviews`
 
 ```bash
+# set project default reviewers for no-flag /gsd-review runs
+gsd config-set review.default_reviewers '["gemini","codex"]'
+
+/gsd-review --phase 2             # runs gemini+codex from config
 /gsd-review --phase 3 --all
 /gsd-review --phase 2 --gemini
+/gsd-review --phase 2 --cursor    # one-off override
 ```
 
 ---
diff --git a/docs/CONFIGURATION.md b/docs/CONFIGURATION.md
index 4b12218cc..a9354c53a 100644
--- a/docs/CONFIGURATION.md
+++ b/docs/CONFIGURATION.md
@@ -66,6 +66,10 @@ GSD stores project settings in `.planning/config.json`. Created during `/gsd-new
     "context_warnings": true,
     "workflow_guard": false
   },
+  "review": {
+    "default_reviewers": null,
+    "models": {}
+  },
   "parallelization": {
     "enabled": true,
     "plan_level": true,
@@ -173,6 +177,24 @@ API key fields accept a string value (the key itself). They can also be set to t
 
 The `<cli>` slug is validated against `[a-zA-Z0-9_-]+`. Empty or path-containing slugs are rejected by `config-set`.
 
+### Reviewer defaults for `/gsd-review`
+
+Use `review.default_reviewers` to scope the no-flag `/gsd-review` run to a subset of detected reviewers.
+
+| Setting | Type | Default | Description |
+|---------|------|---------|-------------|
+| `review.default_reviewers` | string[] \| null | `null` (all detected reviewers) | Optional default subset for no-flag `/gsd-review`, e.g. `["gemini","codex"]`. Precedence is: explicit reviewer flags > `--all` > `review.default_reviewers` > all detected. Unknown slugs are ignored with a warning; known-but-undetected slugs are ignored with an info note; empty arrays are rejected by `config-set`. |
+
+Example:
+
+```json
+{
+  "review": {
+    "default_reviewers": ["gemini", "codex"]
+  }
+}
+```
+
 ### Agent-skill injection (dynamic)
 
 `agent_skills.<agent-type>` extends the `agent_skills` map documented below. Slug is validated against `[a-zA-Z0-9_-]+` — no path separators, no whitespace, no shell metacharacters. Configured interactively via `/gsd-config --integrations`.
@@ -650,6 +672,7 @@ Configure per-CLI model selection for `/gsd-review`. When set, overrides the CLI
 | `review.models.ollama` | string | (server default) | Model name passed to Ollama when `--ollama` reviewer is invoked. If unset, the first available model reported by the server is used (e.g. `llama3`). Set to a specific tag: `gsd config-set review.models.ollama codellama` |
 | `review.models.lm_studio` | string | (server default) | Model name passed to LM Studio when `--lm-studio` reviewer is invoked. If unset, the first available model reported by the server is used. |
 | `review.models.llama_cpp` | string | (server default) | Model name passed to llama.cpp when `--llama-cpp` reviewer is invoked. If unset, the first model reported by `/v1/models` is used. |
+| `review.default_reviewers` | string[] \| null | (all detected reviewers) | Default reviewer subset for no-flag `/gsd-review`. Example: `["gemini","codex"]`. Explicit flags and `--all` override this setting. |
 | `review.ollama_host` | string | `http://localhost:11434` | Base URL of the Ollama server. Override when running Ollama on a non-default port or remote host: `gsd config-set review.ollama_host http://192.168.1.10:11434` |
 | `review.lm_studio_host` | string | `http://localhost:1234` | Base URL of the LM Studio local server. Override when using a non-default port. |
 | `review.llama_cpp_host` | string | `http://localhost:8080` | Base URL of the llama.cpp server (`llama-server`). Override when using a non-default port. |
diff --git a/docs/FEATURES.md b/docs/FEATURES.md
index 319f84049..9fa79a2e4 100644
--- a/docs/FEATURES.md
+++ b/docs/FEATURES.md
@@ -1177,7 +1177,7 @@ When verification returns `human_needed`, items are persisted as a trackable HUM
 
 ### 42. Cross-AI Peer Review
 
-**Command:** `/gsd-review --phase N [--gemini] [--claude] [--codex] [--coderabbit] [--opencode] [--qwen] [--cursor] [--all]`
+**Command:** `/gsd-review --phase N [--gemini] [--claude] [--codex] [--coderabbit] [--opencode] [--qwen] [--cursor] [--ollama] [--lm-studio] [--llama-cpp] [--all]`
 
 **Purpose:** Invoke external AI CLIs (Gemini, Claude, Codex, CodeRabbit, OpenCode, Qwen Code, Cursor) to independently review phase plans. Produces structured REVIEWS.md with per-reviewer feedback.
 
@@ -1187,9 +1187,15 @@ When verification returns `human_needed`, items are persisted as a trackable HUM
 - REQ-REVIEW-03: System MUST invoke each selected CLI independently
 - REQ-REVIEW-04: System MUST collect responses and produce `REVIEWS.md`
 - REQ-REVIEW-05: Reviews MUST be consumable by `/gsd-plan-phase --reviews`
+- REQ-REVIEW-06: System MUST support project-level no-flag defaults via `review.default_reviewers`
+- REQ-REVIEW-07: Reviewer precedence MUST be explicit flags > `--all` > `review.default_reviewers` > all detected reviewers
 
 **Produces:** `{phase}-REVIEWS.md` — Per-reviewer structured feedback
 
+**User configuration note:**
+- Set `review.default_reviewers` in `.planning/config.json` (or via `gsd config-set`) to control no-flag `/gsd-review` fan-out.
+- Use `--all` for a full pre-merge sweep without changing project defaults.
+
 ---
 
 ### 43. Backlog Parking Lot
diff --git a/docs/INVENTORY-MANIFEST.json b/docs/INVENTORY-MANIFEST.json
index 284e65db6..d887d72de 100644
--- a/docs/INVENTORY-MANIFEST.json
+++ b/docs/INVENTORY-MANIFEST.json
@@ -1,5 +1,5 @@
 {
-  "generated": "2026-05-12",
+  "generated": "2026-05-13",
   "families": {
     "agents": [
       "gsd-advisor-researcher",
@@ -295,6 +295,7 @@
       "planning-workspace.cjs",
       "profile-output.cjs",
       "profile-pipeline.cjs",
+      "review-reviewer-selection.cjs",
       "roadmap-command-router.cjs",
       "roadmap.cjs",
       "runtime-homes.cjs",
diff --git a/docs/INVENTORY.md b/docs/INVENTORY.md
index 4d7f6d006..f7317505a 100644
--- a/docs/INVENTORY.md
+++ b/docs/INVENTORY.md
@@ -360,7 +360,7 @@ The `gsd-planner` agent is decomposed into a core agent plus reference modules t
 
 ---
 
-## CLI Modules (57 shipped)
+## CLI Modules (58 shipped)
 
 Full listing: `get-shit-done/bin/lib/*.cjs`.
 
@@ -403,6 +403,7 @@ Full listing: `get-shit-done/bin/lib/*.cjs`.
 | `planning-workspace.cjs` | Planning path/workstream seam (`planningDir`, `planningPaths`, active-workstream routing, `.planning/.lock` orchestration) |
 | `profile-output.cjs` | Profile rendering, USER-PROFILE.md and dev-preferences.md generation |
 | `profile-pipeline.cjs` | User behavioral profiling data pipeline, session file scanning |
+| `review-reviewer-selection.cjs` | Reviewer selection/normalization helpers for `/gsd-review` default reviewer policy and precedence |
 | `roadmap-command-router.cjs` | Thin CJS subcommand router adapter for `gsd-tools roadmap` |
 | `roadmap.cjs` | ROADMAP.md parsing, phase extraction, plan progress |
 | `runtime-homes.cjs` | Canonical runtime → global config/skills directory mapping; first-class support for all 15 runtimes including Hermes nested layout and Cline rules-based exclusion (#3126) |
diff --git a/get-shit-done/bin/lib/config-schema.cjs b/get-shit-done/bin/lib/config-schema.cjs
index b2e56e95c..e4465b785 100644
--- a/get-shit-done/bin/lib/config-schema.cjs
+++ b/get-shit-done/bin/lib/config-schema.cjs
@@ -47,6 +47,7 @@ const VALID_CONFIG_KEYS = new Set([
   'git.branching_strategy', 'git.base_branch', 'git.phase_branch_template', 'git.milestone_branch_template', 'git.quick_branch_template',
   'planning.commit_docs', 'planning.search_gitignored', 'planning.sub_repos',
   'review.ollama_host', 'review.lm_studio_host', 'review.llama_cpp_host',
+  'review.default_reviewers',
   'workflow.cross_ai_execution', 'workflow.cross_ai_command', 'workflow.cross_ai_timeout',
   'workflow.subagent_timeout',
   'executor.stall_detect_interval_minutes',
diff --git a/get-shit-done/bin/lib/config.cjs b/get-shit-done/bin/lib/config.cjs
index fa384ffcb..f1c9b0661 100644
--- a/get-shit-done/bin/lib/config.cjs
+++ b/get-shit-done/bin/lib/config.cjs
@@ -13,6 +13,7 @@ const {
 } = require('./model-profiles.cjs');
 const { VALID_CONFIG_KEYS, isValidConfigKey } = require('./config-schema.cjs');
 const { isSecretKey, maskSecret } = require('./secrets.cjs');
+const { normalizeConfiguredDefaultReviewers } = require('./review-reviewer-selection.cjs');
 
 const CONFIG_KEY_SUGGESTIONS = {
   'workflow.nyquist_validation_enabled': 'workflow.nyquist_validation',
@@ -444,6 +445,14 @@ function cmdConfigSet(cwd, keyPath, value, raw) {
     error(`Invalid workflow.human_verify_mode '${value}'. Valid values: ${VALID_HUMAN_VERIFY_MODES.join(', ')}`);
   }
 
+  if (keyPath === 'review.default_reviewers') {
+    const normalized = normalizeConfiguredDefaultReviewers(parsedValue);
+    if (normalized.errors.length > 0) {
+      error(normalized.errors[0]);
+    }
+    parsedValue = normalized.values;
+  }
+
   const setConfigValueResult = setConfigValue(cwd, keyPath, parsedValue);
 
   // Mask secrets in both JSON and text output. The plaintext is written
diff --git a/get-shit-done/bin/lib/review-reviewer-selection.cjs b/get-shit-done/bin/lib/review-reviewer-selection.cjs
new file mode 100644
index 000000000..7d8d3225f
--- /dev/null
+++ b/get-shit-done/bin/lib/review-reviewer-selection.cjs
@@ -0,0 +1,125 @@
+'use strict';
+
+/**
+ * Review Reviewer Selection Module
+ *
+ * Owns reviewer-selection policy projection for /gsd:review:
+ * explicit flags > --all > review.default_reviewers > all detected.
+ */
+
+const KNOWN_REVIEWER_SLUGS = [
+  'gemini',
+  'claude',
+  'codex',
+  'coderabbit',
+  'opencode',
+  'qwen',
+  'cursor',
+  'ollama',
+  'lm_studio',
+  'llama_cpp',
+];
+
+function normalizeConfiguredDefaultReviewers(rawValue) {
+  if (rawValue === undefined || rawValue === null) {
+    return { absent: true, values: [], errors: [] };
+  }
+  if (!Array.isArray(rawValue)) {
+    return {
+      absent: false,
+      values: [],
+      errors: ['review.default_reviewers must be a JSON array of reviewer slugs'],
+    };
+  }
+  if (rawValue.length === 0) {
+    return {
+      absent: false,
+      values: [],
+      errors: ['review.default_reviewers cannot be empty'],
+    };
+  }
+
+  const seen = new Set();
+  const normalized = [];
+  const errors = [];
+  for (const item of rawValue) {
+    if (typeof item !== 'string') {
+      errors.push('review.default_reviewers must contain only string slugs');
+      continue;
+    }
+    if (!/^[a-zA-Z0-9_-]+$/.test(item)) {
+      errors.push(`invalid reviewer slug in review.default_reviewers: ${item}`);
+      continue;
+    }
+    const slug = item.toLowerCase();
+    if (!seen.has(slug)) {
+      seen.add(slug);
+      normalized.push(slug);
+    }
+  }
+
+  return { absent: false, values: normalized, errors };
+}
+
+function resolveReviewerSelection(input) {
+  const detected = new Set((input.detected || []).map((v) => String(v).toLowerCase()));
+  const explicitFlags = new Set((input.explicitFlags || []).map((v) => String(v).toLowerCase()));
+  const allFlag = !!input.allFlag;
+  const normalizedDefaults = normalizeConfiguredDefaultReviewers(input.configuredDefaultReviewers);
+
+  const warnings = [];
+  const infos = [];
+  const errors = [...normalizedDefaults.errors];
+
+  let source = 'no_config_all_detected';
+  let selected = [];
+
+  if (explicitFlags.size > 0) {
+    source = 'explicit_flags';
+    selected = [...explicitFlags].filter((slug) => detected.has(slug));
+    const missing = [...explicitFlags].filter((slug) => !detected.has(slug));
+    if (missing.length > 0) {
+      infos.push(`explicit reviewers missing on host: ${missing.join(', ')}`);
+    }
+    if (selected.length === 0 && errors.length === 0) {
+      errors.push('no selected reviewers are available for explicit flags');
+    }
+  } else if (allFlag) {
+    source = 'all_flag';
+    selected = [...detected];
+  } else if (!normalizedDefaults.absent) {
+    source = 'config_default';
+    const knownDefaults = [];
+    for (const slug of normalizedDefaults.values) {
+      if (!KNOWN_REVIEWER_SLUGS.includes(slug)) {
+        warnings.push(`unknown reviewer slug in review.default_reviewers: ${slug}`);
+      } else {
+        knownDefaults.push(slug);
+      }
+    }
+    const undetected = knownDefaults.filter((slug) => !detected.has(slug));
+    if (undetected.length > 0) {
+      infos.push(`configured reviewers not detected on this host: ${undetected.join(', ')}`);
+    }
+    selected = knownDefaults.filter((slug) => detected.has(slug));
+    if (selected.length === 0 && errors.length === 0) {
+      errors.push('all configured default reviewers are unavailable on this host');
+    }
+  } else {
+    selected = [...detected];
+  }
+
+  return {
+    source,
+    selected: selected.sort(),
+    warnings,
+    infos,
+    errors,
+  };
+}
+
+module.exports = {
+  KNOWN_REVIEWER_SLUGS,
+  normalizeConfiguredDefaultReviewers,
+  resolveReviewerSelection,
+};
diff --git a/get-shit-done/workflows/review.md b/get-shit-done/workflows/review.md
index ca8b30c80..2dd10a6f7 100644
--- a/get-shit-done/workflows/review.md
+++ b/get-shit-done/workflows/review.md
@@ -49,7 +49,19 @@ Parse flags from `$ARGUMENTS`:
 - `--lm-studio` → include LM Studio (local server, OpenAI-compatible)
 - `--llama-cpp` → include llama.cpp (local server, OpenAI-compatible)
 - `--all` → include all available (CLIs + running local servers)
-- No flags → include all available
+- No flags → if `review.default_reviewers` is set, include only configured reviewers that are detected; otherwise include all available
+
+Reviewer-selection precedence:
+1. Individual reviewer flags (`--gemini`, `--codex`, etc.)
+2. `--all`
+3. `review.default_reviewers`
+4. No key + no flags → all detected reviewers
+
+`review.default_reviewers` behavior:
+- Value must be a non-empty array of slug strings (configured via `gsd config-set review.default_reviewers '["gemini","codex"]'`)
+- Unknown slugs warn and are ignored
+- Known-but-undetected slugs emit an info note and are ignored
+- If all configured reviewers are unavailable, fail with an actionable message
 
 If no CLIs are available:
 ```
diff --git a/sdk/src/query/config-schema.ts b/sdk/src/query/config-schema.ts
index 8cbee17b4..b1b767e5e 100644
--- a/sdk/src/query/config-schema.ts
+++ b/sdk/src/query/config-schema.ts
@@ -48,6 +48,7 @@ export const VALID_CONFIG_KEYS: ReadonlySet<string> = new Set([
   'ship.pr_body_sections',
   'git.branching_strategy', 'git.base_branch', 'git.phase_branch_template', 'git.milestone_branch_template', 'git.quick_branch_template',
   'planning.commit_docs', 'planning.search_gitignored', 'planning.sub_repos',
+  'review.default_reviewers',
   'review.ollama_host', 'review.lm_studio_host', 'review.llama_cpp_host',
   'workflow.cross_ai_execution', 'workflow.cross_ai_command', 'workflow.cross_ai_timeout',
   'workflow.subagent_timeout',
diff --git a/tests/review-default-reviewers-config.test.cjs b/tests/review-default-reviewers-config.test.cjs
new file mode 100644
index 000000000..185593500
--- /dev/null
+++ b/tests/review-default-reviewers-config.test.cjs
@@ -0,0 +1,99 @@
+'use strict';
+
+const { describe, test, beforeEach, afterEach } = require('node:test');
+const assert = require('node:assert/strict');
+const fs = require('node:fs');
+const path = require('node:path');
+const { runGsdTools, createTempProject, cleanup } = require('./helpers.cjs');
+const {
+  VALID_CONFIG_KEYS,
+} = require('../get-shit-done/bin/lib/config-schema.cjs');
+
+describe('review.default_reviewers config key (#3079)', () => {
+  let tmpDir;
+
+  beforeEach(() => {
+    tmpDir = createTempProject();
+    runGsdTools('config-ensure-section', tmpDir, { HOME: tmpDir, USERPROFILE: tmpDir });
+  });
+
+  afterEach(() => {
+    cleanup(tmpDir);
+  });
+
+  test('schema key is registered', () => {
+    assert.ok(
+      VALID_CONFIG_KEYS.has('review.default_reviewers'),
+      'review.default_reviewers must be in VALID_CONFIG_KEYS'
+    );
+  });
+
+  test('round-trip set/get supports string array and normalizes to lowercase unique slugs', () => {
+    const setResult = runGsdTools(
+      ['config-set', 'review.default_reviewers', '["Gemini","CODEX","codex"]'],
+      tmpDir,
+      { HOME: tmpDir, USERPROFILE: tmpDir }
+    );
+    assert.ok(setResult.success, `config-set failed: ${setResult.error}`);
+
+    const getResult = runGsdTools(
+      ['config-get', 'review.default_reviewers'],
+      tmpDir,
+      { HOME: tmpDir, USERPROFILE: tmpDir }
+    );
+    assert.ok(getResult.success, `config-get failed: ${getResult.error}`);
+    assert.deepStrictEqual(JSON.parse(getResult.output), ['gemini', 'codex']);
+  });
+
+  test('empty array is rejected with schema error', () => {
+    const result = runGsdTools(
+      ['config-set', 'review.default_reviewers', '[]'],
+      tmpDir,
+      { HOME: tmpDir, USERPROFILE: tmpDir }
+    );
+    assert.ok(!result.success, 'config-set should reject empty arrays');
+    assert.ok(
+      result.error.includes('cannot be empty'),
+      `expected empty-array error, got: ${result.error}`
+    );
+  });
+
+  test('non-array value is rejected', () => {
+    const result = runGsdTools(
+      ['config-set', 'review.default_reviewers', 'gemini'],
+      tmpDir,
+      { HOME: tmpDir, USERPROFILE: tmpDir }
+    );
+    assert.ok(!result.success, 'config-set should reject non-array values');
+    assert.ok(
+      result.error.includes('must be a JSON array'),
+      `expected type error, got: ${result.error}`
+    );
+  });
+
+  test('invalid slug is rejected', () => {
+    const result = runGsdTools(
+      ['config-set', 'review.default_reviewers', '["gemini","bad/slug"]'],
+      tmpDir,
+      { HOME: tmpDir, USERPROFILE: tmpDir }
+    );
+    assert.ok(!result.success, 'config-set should reject invalid slugs');
+    assert.ok(
+      result.error.includes('invalid reviewer slug'),
+      `expected slug error, got: ${result.error}`
+    );
+  });
+
+  test('value is persisted in nested review object', () => {
+    const setResult = runGsdTools(
+      ['config-set', 'review.default_reviewers', '["gemini","codex"]'],
+      tmpDir,
+      { HOME: tmpDir, USERPROFILE: tmpDir }
+    );
+    assert.ok(setResult.success, `config-set failed: ${setResult.error}`);
+
+    const cfg = JSON.parse(fs.readFileSync(path.join(tmpDir, '.planning', 'config.json'), 'utf-8'));
+    assert.deepStrictEqual(cfg.review?.default_reviewers, ['gemini', 'codex']);
+  });
+});
+
diff --git a/tests/review-default-reviewers-resolution.test.cjs b/tests/review-default-reviewers-resolution.test.cjs
new file mode 100644
index 000000000..3ddeb3ef0
--- /dev/null
+++ b/tests/review-default-reviewers-resolution.test.cjs
@@ -0,0 +1,67 @@
+'use strict';
+
+const { describe, test } = require('node:test');
+const assert = require('node:assert/strict');
+
+const {
+  resolveReviewerSelection,
+} = require('../get-shit-done/bin/lib/review-reviewer-selection.cjs');
+
+describe('review default reviewers resolution (#3079)', () => {
+  test('no flags + config defaults selects configured subset', () => {
+    const result = resolveReviewerSelection({
+      detected: ['gemini', 'codex', 'claude'],
+      explicitFlags: [],
+      allFlag: false,
+      configuredDefaultReviewers: ['gemini', 'codex'],
+    });
+
+    assert.strictEqual(result.source, 'config_default');
+    assert.deepStrictEqual(result.selected, ['codex', 'gemini']);
+    assert.deepStrictEqual(result.errors, []);
+  });
+
+  test('--all ignores configured defaults', () => {
+    const result = resolveReviewerSelection({
+      detected: ['gemini', 'codex', 'claude'],
+      explicitFlags: [],
+      allFlag: true,
+      configuredDefaultReviewers: ['gemini'],
+    });
+
+    assert.strictEqual(result.source, 'all_flag');
+    assert.deepStrictEqual(result.selected, ['claude', 'codex', 'gemini']);
+  });
+
+  test('explicit flags win over config defaults', () => {
+    const result = resolveReviewerSelection({
+      detected: ['gemini', 'codex', 'claude', 'cursor'],
+      explicitFlags: ['cursor'],
+      allFlag: false,
+      configuredDefaultReviewers: ['gemini', 'codex'],
+    });
+
+    assert.strictEqual(result.source, 'explicit_flags');
+    assert.deepStrictEqual(result.selected, ['cursor']);
+  });
+
+  test('unknown configured slugs warn and all-undetected known slugs error', () => {
+    const result = resolveReviewerSelection({
+      detected: ['gemini'],
+      explicitFlags: [],
+      allFlag: false,
+      configuredDefaultReviewers: ['unknown_slug', 'codex'],
+    });
+
+    assert.strictEqual(result.source, 'config_default');
+    assert.ok(
+      result.warnings.some((msg) => msg.includes('unknown reviewer slug') && msg.includes('unknown_slug')),
+      `expected warning for unknown slug, got: ${JSON.stringify(result.warnings)}`
+    );
+    assert.ok(
+      result.errors.some((msg) => msg.includes('all configured default reviewers are unavailable')),
+      `expected unavailable error, got: ${JSON.stringify(result.errors)}`
+    );
+  });
+});
+
diff --git a/tests/review-default-reviewers-workflow.test.cjs b/tests/review-default-reviewers-workflow.test.cjs
new file mode 100644
index 000000000..0d8e24129
--- /dev/null
+++ b/tests/review-default-reviewers-workflow.test.cjs
@@ -0,0 +1,48 @@
+'use strict';
+
+// allow-test-rule: source-text-is-the-product
+// Workflow markdown is runtime contract; these assertions verify deployed behavior text.
+
+const { describe, test } = require('node:test');
+const assert = require('node:assert/strict');
+const fs = require('node:fs');
+const path = require('node:path');
+
+describe('review workflow default reviewer selection contract (#3079)', () => {
+  const workflow = fs.readFileSync(
+    path.join(process.cwd(), 'get-shit-done', 'workflows', 'review.md'),
+    'utf8'
+  );
+
+  test('documents review.default_reviewers no-flag behavior', () => {
+    assert.ok(
+      workflow.includes('review.default_reviewers'),
+      'review workflow must reference review.default_reviewers for no-flag selection'
+    );
+  });
+
+  test('documents precedence order with explicit flags and --all overrides', () => {
+    assert.ok(
+      workflow.includes('Individual reviewer flags') &&
+      workflow.includes('--all') &&
+      workflow.includes('review.default_reviewers'),
+      'review workflow must document precedence: flags > --all > review.default_reviewers'
+    );
+  });
+
+  test('documents unknown/undetected configured slug handling', () => {
+    assert.ok(
+      workflow.includes('Unknown slugs warn') &&
+      workflow.includes('Known-but-undetected slugs'),
+      'review workflow must document unknown and undetected slug handling'
+    );
+  });
+
+  test('documents failure behavior when all configured reviewers unavailable', () => {
+    assert.ok(
+      workflow.includes('all configured reviewers are unavailable') &&
+      workflow.includes('fail'),
+      'review workflow must document failure path when configured reviewers are unavailable'
+    );
+  });
+});