diff --git a/gitnexus/src/cli/group.ts b/gitnexus/src/cli/group.ts
index d9929cc1f..eb0dffc3d 100644
--- a/gitnexus/src/cli/group.ts
+++ b/gitnexus/src/cli/group.ts
@@ -194,7 +194,10 @@ export function registerGroupCommands(program: Command): void {
     )
     .option('--direction <dir>', 'upstream or downstream', 'upstream')
     .option('--service <path>', 'Optional monorepo service directory prefix (path filter)')
-    .option('--subgroup <path>', 'Optional prefix limiting which group repos participate in cross fan-out')
+    .option(
+      '--subgroup <path>',
+      'Optional prefix limiting which group repos participate in cross fan-out',
+    )
     .option('--max-depth <n>', 'Max graph traversal depth')
     .option('--cross-depth <n>', 'Cross-repository hop depth')
     .option('--min-confidence <n>', 'Minimum relation confidence (0–1)')
diff --git a/gitnexus/src/core/group/cross-impact.ts b/gitnexus/src/core/group/cross-impact.ts
index 6b549422d..fe9db5cc8 100644
--- a/gitnexus/src/core/group/cross-impact.ts
+++ b/gitnexus/src/core/group/cross-impact.ts
@@ -18,12 +18,7 @@ import type { GroupRepoHandle, GroupToolPort } from './service.js';
 import { loadGroupConfig } from './config-parser.js';
 import { fileMatchesServicePrefix, normalizeServicePrefix } from './group-path-utils.js';
 import { getGroupDir } from './storage.js';
-import {
-  closeBridgeDb,
-  openBridgeDbReadOnly,
-  queryBridge,
-  readBridgeMeta,
-} from './bridge-db.js';
+import { closeBridgeDb, openBridgeDbReadOnly, queryBridge, readBridgeMeta } from './bridge-db.js';
 import { BRIDGE_SCHEMA_VERSION } from './bridge-schema.js';
 
 /** Cross-boundary hops beyond this value are clamped (multi-hop reserved for future work). */
@@ -98,29 +93,36 @@ function clampCrossDepth(raw: unknown): { depth: number; warning?: string } {
   return { depth: d };
 }
 
-export function validateGroupImpactParams(params: Record<string, unknown>): {
-  ok: true;
-  name: string;
-  repoPath: string;
-  target: string;
-  direction: 'upstream' | 'downstream';
-  maxDepth: number;
-  crossDepth: number;
-  crossDepthWarning?: string;
-  relationTypes?: string[];
-  includeTests: boolean;
-  minConfidence: number;
-  service?: string;
-  subgroup?: string;
-  timeoutMs: number;
-} | { ok: false; error: string } {
+export function validateGroupImpactParams(params: Record<string, unknown>):
+  | {
+      ok: true;
+      name: string;
+      repoPath: string;
+      target: string;
+      direction: 'upstream' | 'downstream';
+      maxDepth: number;
+      crossDepth: number;
+      crossDepthWarning?: string;
+      relationTypes?: string[];
+      includeTests: boolean;
+      minConfidence: number;
+      service?: string;
+      subgroup?: string;
+      timeoutMs: number;
+    }
+  | { ok: false; error: string } {
   const name = String(params.name ?? '').trim();
   const repoPath = String(params.repo ?? '').trim();
   const target = String(params.target ?? '').trim();
   if (!name) return { ok: false, error: 'name is required' };
-  if (!repoPath) return { ok: false, error: 'repo is required (group repo path, e.g. app/backend)' };
+  if (!repoPath)
+    return { ok: false, error: 'repo is required (group repo path, e.g. app/backend)' };
   if (!target) return { ok: false, error: 'target is required' };
-  if (params.service !== undefined && params.service !== null && String(params.service).trim() === '') {
+  if (
+    params.service !== undefined &&
+    params.service !== null &&
+    String(params.service).trim() === ''
+  ) {
     return { ok: false, error: 'service must not be an empty string' };
   }
   const direction = parseDirection(params.direction);
@@ -292,7 +294,8 @@ function rowToNeighbor(r: Record<string, unknown>): BridgeNeighborRow | null {
   return {
     neighborRepo,
     neighborUid,
-    neighborFilePath: r.neighborFilePath !== undefined ? String(r.neighborFilePath) : String(r[2] ?? ''),
+    neighborFilePath:
+      r.neighborFilePath !== undefined ? String(r.neighborFilePath) : String(r[2] ?? ''),
     matchType: String(r.matchType ?? r[3] ?? 'exact'),
     confidence: Number(r.confidence ?? r[4] ?? 0),
     contractId: String(r.contractId ?? r[5] ?? ''),
@@ -500,17 +503,12 @@ export async function runGroupImpact(
         continue;
       }
 
-      const fan = await deps.port.impactByUid(
-        neighborHandle.id,
-        n.neighborUid,
-        direction,
-        {
-          maxDepth,
-          relationTypes: relationTypes ?? [],
-          minConfidence,
-          includeTests,
-        },
-      );
+      const fan = await deps.port.impactByUid(neighborHandle.id, n.neighborUid, direction, {
+        maxDepth,
+        relationTypes: relationTypes ?? [],
+        minConfidence,
+        includeTests,
+      });
       if (fan == null) {
         truncatedRepos.push(n.neighborRepo);
         continue;
diff --git a/gitnexus/src/core/group/service.ts b/gitnexus/src/core/group/service.ts
index 066d61d2e..3111849f3 100644
--- a/gitnexus/src/core/group/service.ts
+++ b/gitnexus/src/core/group/service.ts
@@ -8,12 +8,7 @@ import path from 'node:path';
 import { checkStaleness } from '../git-staleness.js';
 import { loadGroupConfig } from './config-parser.js';
 import { fileMatchesServicePrefix, normalizeServicePrefix } from './group-path-utils.js';
-import {
-  getDefaultGitnexusDir,
-  getGroupDir,
-  listGroups,
-  readContractRegistry,
-} from './storage.js';
+import { getDefaultGitnexusDir, getGroupDir, listGroups, readContractRegistry } from './storage.js';
 import { syncGroup } from './sync.js';
 import type {
   ContractRegistry,
@@ -109,11 +104,17 @@ function isStoredContract(raw: unknown): raw is StoredContract {
 }
 
 function filterQueryByServicePrefix(
-  queryResult: { processes?: Array<Record<string, unknown>>; process_symbols?: Array<Record<string, unknown>> },
+  queryResult: {
+    processes?: Array<Record<string, unknown>>;
+    process_symbols?: Array<Record<string, unknown>>;
+  },
   servicePrefix: string,
 ): { processes: Array<Record<string, unknown>>; process_symbols: Array<Record<string, unknown>> } {
   const symbols = (queryResult.process_symbols || []).filter((s) =>
-    fileMatchesServicePrefix(typeof s.filePath === 'string' ? s.filePath : undefined, servicePrefix),
+    fileMatchesServicePrefix(
+      typeof s.filePath === 'string' ? s.filePath : undefined,
+      servicePrefix,
+    ),
   );
   const allowed = new Set(
     symbols.map((s) => String((s as { process_id?: string }).process_id ?? '')).filter(Boolean),
@@ -135,8 +136,7 @@ function isCrossLink(raw: unknown): raw is CrossLink {
 async function loadContractRegistryResilient(
   groupDir: string,
 ): Promise<
-  | { ok: true; registry: ContractRegistry; skippedCorrupt: number }
-  | { ok: false; error: string }
+  { ok: true; registry: ContractRegistry; skippedCorrupt: number } | { ok: false; error: string }
 > {
   const filePath = path.join(groupDir, 'contracts.json');
   let raw: string;
@@ -206,9 +206,7 @@ async function loadContractRegistryResilient(
       base.repoSnapshots && typeof base.repoSnapshots === 'object' && base.repoSnapshots !== null
         ? (base.repoSnapshots as Record<string, { indexedAt: string; lastCommit: string }>)
         : {},
-    missingRepos: Array.isArray(base.missingRepos)
-      ? (base.missingRepos as string[])
-      : [],
+    missingRepos: Array.isArray(base.missingRepos) ? (base.missingRepos as string[]) : [],
     contracts,
     crossLinks,
   };
@@ -295,7 +293,11 @@ export class GroupService {
     const uid = typeof params.uid === 'string' ? params.uid.trim() : undefined;
     const file_path = typeof params.file_path === 'string' ? params.file_path : undefined;
     const include_content = Boolean(params.include_content);
-    if (params.service !== undefined && params.service !== null && String(params.service).trim() === '') {
+    if (
+      params.service !== undefined &&
+      params.service !== null &&
+      String(params.service).trim() === ''
+    ) {
       return { group: name || '', error: 'service must not be an empty string', results: [] };
     }
     const servicePrefix = normalizeServicePrefix(params.service);
@@ -367,7 +369,11 @@ export class GroupService {
     const name = String(params.name ?? '').trim();
     const queryText = String(params.query ?? '').trim();
     if (!name || !queryText) return { error: 'name and query are required' };
-    if (params.service !== undefined && params.service !== null && String(params.service).trim() === '') {
+    if (
+      params.service !== undefined &&
+      params.service !== null &&
+      String(params.service).trim() === ''
+    ) {
       return { error: 'service must not be an empty string' };
     }
     const servicePrefix = normalizeServicePrefix(params.service);
diff --git a/gitnexus/src/mcp/local/local-backend.ts b/gitnexus/src/mcp/local/local-backend.ts
index c37ebf4a9..129cda678 100644
--- a/gitnexus/src/mcp/local/local-backend.ts
+++ b/gitnexus/src/mcp/local/local-backend.ts
@@ -2892,7 +2892,8 @@ export class LocalBackend {
       if (params.relationTypes !== undefined) impactArgs.relationTypes = params.relationTypes;
       if (params.includeTests !== undefined) impactArgs.includeTests = params.includeTests;
       if (params.minConfidence !== undefined) impactArgs.minConfidence = params.minConfidence;
-      if (params.service !== undefined && params.service !== null) impactArgs.service = params.service;
+      if (params.service !== undefined && params.service !== null)
+        impactArgs.service = params.service;
       if (typeof params.subgroup === 'string') impactArgs.subgroup = params.subgroup;
       if (params.timeoutMs !== undefined) impactArgs.timeoutMs = params.timeoutMs;
       if (params.timeout !== undefined) impactArgs.timeout = params.timeout;
@@ -2908,7 +2909,8 @@ export class LocalBackend {
       if (typeof params.limit === 'number') queryArgs.limit = params.limit;
       if (typeof params.max_symbols === 'number') queryArgs.max_symbols = params.max_symbols;
       if (params.include_content !== undefined) queryArgs.include_content = params.include_content;
-      if (params.service !== undefined && params.service !== null) queryArgs.service = params.service;
+      if (params.service !== undefined && params.service !== null)
+        queryArgs.service = params.service;
       if (memberRest !== undefined) {
         queryArgs.subgroup = memberRest;
         queryArgs.subgroupExact = true;
@@ -2928,8 +2930,10 @@ export class LocalBackend {
       };
       if (typeof params.uid === 'string') contextArgs.uid = params.uid;
       if (typeof params.file_path === 'string') contextArgs.file_path = params.file_path;
-      if (params.include_content !== undefined) contextArgs.include_content = params.include_content;
-      if (params.service !== undefined && params.service !== null) contextArgs.service = params.service;
+      if (params.include_content !== undefined)
+        contextArgs.include_content = params.include_content;
+      if (params.service !== undefined && params.service !== null)
+        contextArgs.service = params.service;
       if (memberRest !== undefined) {
         contextArgs.subgroup = memberRest;
         contextArgs.subgroupExact = true;
diff --git a/gitnexus/src/mcp/resources.ts b/gitnexus/src/mcp/resources.ts
index 6fbab99ce..88e7a99cc 100644
--- a/gitnexus/src/mcp/resources.ts
+++ b/gitnexus/src/mcp/resources.ts
@@ -153,7 +153,10 @@ export function parseResourceUri(uri: string): ParsedGitnexusResource {
   }
 
   if (u.hostname === 'group') {
-    const segments = u.pathname.replace(/^\/+|\/+$/g, '').split('/').filter(Boolean);
+    const segments = u.pathname
+      .replace(/^\/+|\/+$/g, '')
+      .split('/')
+      .filter(Boolean);
     if (segments.length < 2) {
       throw new Error(
         `Invalid group resource URI (expected gitnexus://group/{name}/contracts or .../status): ${uri}`,
@@ -186,7 +189,10 @@ export function parseResourceUri(uri: string): ParsedGitnexusResource {
   }
 
   if (u.hostname === 'repo') {
-    const segments = u.pathname.replace(/^\/+|\/+$/g, '').split('/').filter(Boolean);
+    const segments = u.pathname
+      .replace(/^\/+|\/+$/g, '')
+      .split('/')
+      .filter(Boolean);
     if (segments.length < 2) {
       throw new Error(`Unknown resource URI: ${uri}`);
     }
@@ -342,7 +348,9 @@ async function getContextResource(backend: LocalBackend, repoName?: string): Pro
   lines.push(`  - gitnexus://repo/${context.projectName}/processes: All execution flows`);
   lines.push(`  - gitnexus://repo/${context.projectName}/cluster/{name}: Module details`);
   lines.push(`  - gitnexus://repo/${context.projectName}/process/{name}: Process trace`);
-  lines.push('  - gitnexus://group/{name}/contracts: Group contract registry (optional ?type=&repo=&unmatchedOnly=)');
+  lines.push(
+    '  - gitnexus://group/{name}/contracts: Group contract registry (optional ?type=&repo=&unmatchedOnly=)',
+  );
   lines.push('  - gitnexus://group/{name}/status: Group index / contract staleness');
 
   return lines.join('\n');
diff --git a/gitnexus/src/mcp/tools.ts b/gitnexus/src/mcp/tools.ts
index f5fc31f47..491c24557 100644
--- a/gitnexus/src/mcp/tools.ts
+++ b/gitnexus/src/mcp/tools.ts
@@ -357,7 +357,8 @@ SERVICE: optional monorepo path prefix (case-sensitive path segments). When "rep
         includeTests: { type: 'boolean', description: 'Include test files (default: false)' },
         minConfidence: {
           type: 'number',
-          description: 'Minimum edge confidence 0–1 (default: 0 when omitted; server clamps to 0–1)',
+          description:
+            'Minimum edge confidence 0–1 (default: 0 when omitted; server clamps to 0–1)',
           default: 0,
           minimum: 0,
           maximum: 1,
@@ -380,7 +381,8 @@ SERVICE: optional monorepo path prefix (case-sensitive path segments). When "rep
         },
         timeoutMs: {
           type: 'number',
-          description: 'Wall-clock budget in milliseconds for the Phase-1 local impact leg (default 30000)',
+          description:
+            'Wall-clock budget in milliseconds for the Phase-1 local impact leg (default 30000)',
           minimum: 1,
           maximum: 3600000,
         },
diff --git a/gitnexus/test/unit/group/cross-impact.test.ts b/gitnexus/test/unit/group/cross-impact.test.ts
index 869130357..3d78ff1cf 100644
--- a/gitnexus/test/unit/group/cross-impact.test.ts
+++ b/gitnexus/test/unit/group/cross-impact.test.ts
@@ -53,7 +53,12 @@ describe('cross-impact', () => {
   });
 
   it('test_validateGroupImpactParams_rejects_bad_direction', () => {
-    const r = validateGroupImpactParams({ name: 'g', repo: 'a', target: 't', direction: 'sideways' });
+    const r = validateGroupImpactParams({
+      name: 'g',
+      repo: 'a',
+      target: 't',
+      direction: 'sideways',
+    });
     expect(r.ok).toBe(false);
     if (!r.ok) expect(r.error).toContain('direction');
   });
diff --git a/gitnexus/test/unit/group/service.test.ts b/gitnexus/test/unit/group/service.test.ts
index 56a8811a6..8c5c0ed6d 100644
--- a/gitnexus/test/unit/group/service.test.ts
+++ b/gitnexus/test/unit/group/service.test.ts
@@ -398,7 +398,10 @@ repos:
           query: 'x',
           subgroup: 'app/frontend',
         })) as { per_repo: Array<{ repo: string }> };
-        expect(prefixOnly.per_repo.map((r) => r.repo).sort()).toEqual(['app/frontend', 'app/frontend/mobile']);
+        expect(prefixOnly.per_repo.map((r) => r.repo).sort()).toEqual([
+          'app/frontend',
+          'app/frontend/mobile',
+        ]);
 
         const exact = (await svc.groupQuery({
           name: 'nest-group',
diff --git a/gitnexus/test/unit/mcp/group-repo-routing.test.ts b/gitnexus/test/unit/mcp/group-repo-routing.test.ts
index 69ca0d085..ddf7d03a5 100644
--- a/gitnexus/test/unit/mcp/group-repo-routing.test.ts
+++ b/gitnexus/test/unit/mcp/group-repo-routing.test.ts
@@ -63,8 +63,12 @@ repos:
 `,
     );
     vi.stubEnv('GITNEXUS_HOME', tmpDir);
-    groupSpyQuery = vi.spyOn(GroupService.prototype, 'groupQuery').mockResolvedValue({ via: 'query' });
-    groupSpyImpact = vi.spyOn(GroupService.prototype, 'groupImpact').mockResolvedValue({ via: 'impact' });
+    groupSpyQuery = vi
+      .spyOn(GroupService.prototype, 'groupQuery')
+      .mockResolvedValue({ via: 'query' });
+    groupSpyImpact = vi
+      .spyOn(GroupService.prototype, 'groupImpact')
+      .mockResolvedValue({ via: 'impact' });
     groupSpyContext = vi.spyOn(GroupService.prototype, 'groupContext').mockResolvedValue({
       group: 'g1',
       results: [],
@@ -139,7 +143,9 @@ repos:
     const backend = new LocalBackend();
     const out = await backend.callTool('query', { repo: '@no-such-group', query: 'x' });
     expect(out).toHaveProperty('error');
-    expect(String((out as { error: string }).error)).toMatch(/not found|no such|unknown|exist|ENOENT/i);
+    expect(String((out as { error: string }).error)).toMatch(
+      /not found|no such|unknown|exist|ENOENT/i,
+    );
   });
 
   it('returns error for unknown member path', async () => {
@@ -165,7 +171,9 @@ repos:
 
   it('removed group_contracts mentions migration', async () => {
     const backend = new LocalBackend();
-    await expect(backend.callTool('group_contracts', { name: 'g1' })).rejects.toThrow(/Removed tools/);
+    await expect(backend.callTool('group_contracts', { name: 'g1' })).rejects.toThrow(
+      /Removed tools/,
+    );
   });
 
   it('removed group_status mentions migration', async () => {
@@ -204,14 +212,19 @@ repos:
         params: { repo: '@myproduct', target: 'UserService.login', service: 'app/backend' },
         spy: () => groupSpyContext,
       },
-    ])('$method with repo "@myproduct" routes to GroupService and forwards service', async ({ method, params, spy }) => {
-      const backend = new LocalBackend();
-      await backend.callTool(method, params);
-      expect(spy()).toHaveBeenCalledWith(
-        expect.objectContaining({ name: 'myproduct', service: 'app/backend' }),
-      );
-      const callArg = spy().mock.calls[0][0] as Record<string, unknown>;
-      expect(typeof callArg.repo === 'string' ? (callArg.repo as string).startsWith('@') : false).toBe(false);
-    });
+    ])(
+      '$method with repo "@myproduct" routes to GroupService and forwards service',
+      async ({ method, params, spy }) => {
+        const backend = new LocalBackend();
+        await backend.callTool(method, params);
+        expect(spy()).toHaveBeenCalledWith(
+          expect.objectContaining({ name: 'myproduct', service: 'app/backend' }),
+        );
+        const callArg = spy().mock.calls[0][0] as Record<string, unknown>;
+        expect(
+          typeof callArg.repo === 'string' ? (callArg.repo as string).startsWith('@') : false,
+        ).toBe(false);
+      },
+    );
   });
 });