diff --git a/vscode/src/codeReader/callTree/endpoint.test.ts b/vscode/src/codeReader/callTree/endpoint.test.ts
index 78e4c6d..0d947fd 100644
--- a/vscode/src/codeReader/callTree/endpoint.test.ts
+++ b/vscode/src/codeReader/callTree/endpoint.test.ts
@@ -35,6 +35,52 @@ describe('后端路由对到契约里的那一条', () => {
   })
 })
 
+describe('同一个路由对象上的接口一起定挂载前缀', () => {
+  /** luffy 的样子：用户端 /agents 和管理端 /admin/agents 里都有 list_agents，挂载前缀都是 /api/v1。 */
+  const LUFFY = [
+    op('GET', '/api/v1/agents', 'list_agents_api_v1_agents_get'),
+    op('GET', '/api/v1/agents/default', 'get_default_agent_api_v1_agents_default_get'),
+    op('POST', '/api/v1/agents', 'create_agent_api_v1_agents_post'),
+    op('GET', '/api/v1/admin/agents', 'list_agents_api_v1_admin_agents_get'),
+    op('GET', '/api/v1/admin/agents/{agent_id}', 'get_agent_api_v1_admin_agents__agent_id__get'),
+  ]
+  const user = [{ method: 'GET', path: '/agents' }, { method: 'GET', path: '/agents/default' }, { method: 'POST', path: '/agents' }]
+  const admin = [{ method: 'GET', path: '/admin/agents' }, { method: 'GET', path: '/admin/agents/{agent_id}' }]
+
+  it('同名接口分不出时，靠同一个路由对象上别的接口定出前缀（别的方法的也算）', () => {
+    expect(routeCandidates(LUFFY, { method: 'GET', path: '/agents', operationIdPrefix: 'list_agents_', sameRouter: user })).toEqual(['/api/v1/agents'])
+    expect(routeCandidates(LUFFY, { method: 'GET', path: '/agents', operationIdPrefix: 'list_agents_', sameRouter: user.filter(route => route.method === 'POST') })).toEqual(['/api/v1/agents'])
+  })
+
+  it('契约里一条都对不上的接口（过期、新加的）不参与，不拖累别的接口', () => {
+    const stale = [...user, { method: 'GET', path: '/agents/not-generated-yet' }]
+    expect(routeCandidates(LUFFY, { method: 'GET', path: '/agents', operationIdPrefix: 'list_agents_', sameRouter: stale })).toEqual(['/api/v1/agents'])
+  })
+
+  it('各路由对象按自己的接口算', () => {
+    expect(routeCandidates(LUFFY, { method: 'GET', path: '/admin/agents', operationIdPrefix: 'list_agents_', sameRouter: admin })).toEqual(['/api/v1/admin/agents'])
+  })
+
+  it('定出的前缀还有几个时退到 operationId 挑；还分不出就照样是几条', () => {
+    const twice = [
+      op('GET', '/api/v1/agents', 'list_agents_api_v1_agents_get'),
+      op('GET', '/api/v1/agents/default', 'get_default_agent_api_v1_agents_default_get'),
+      op('GET', '/legacy/agents', 'legacy_list_legacy_agents_get'),
+      op('GET', '/legacy/agents/default', 'legacy_default_legacy_agents_default_get'),
+    ]
+    const routes = [{ method: 'GET', path: '/agents' }, { method: 'GET', path: '/agents/default' }]
+    expect(routeCandidates(twice, { method: 'GET', path: '/agents', operationIdPrefix: 'list_agents_', sameRouter: routes })).toEqual(['/api/v1/agents'])
+    const sameName = twice.map(item => ({ ...item, operationId: item.operationId?.replace('legacy_list_', 'list_agents_') }))
+    expect(routeCandidates(sameName, { method: 'GET', path: '/agents', operationIdPrefix: 'list_agents_', sameRouter: routes })).toEqual(['/api/v1/agents', '/legacy/agents'])
+  })
+
+  it('各接口的前缀凑不到一起时照只看这一个接口的办法', () => {
+    const apart = [...LUFFY, op('GET', '/other/x', 'x_other_x_get')]
+    expect(routeCandidates(apart, { method: 'GET', path: '/agents', operationIdPrefix: 'list_agents_', sameRouter: [{ method: 'GET', path: '/agents' }, { method: 'GET', path: '/x' }] }))
+      .toEqual(['/api/v1/agents', '/api/v1/admin/agents'])
+  })
+})
+
 describe('前端请求对到契约里最具体的那一条', () => {
   const paths = ['/api/v1/agents', '/api/v1/agents/default', '/api/v1/agents/{agent_id}']
 
@@ -105,4 +151,11 @@ describe('接口卡片找前端调用它的地方', () => {
     expect(await calls({ ...files, 'web/src/lib/api/schema.d.ts': admin }, { method: 'GET', path: '/agents', operationIdPrefix: 'list_agents_' }))
       .toEqual({ contracts: ['web/src/lib/api/schema.d.ts'], ambiguous: ['/api/v1/admin/agents', '/api/v1/agents'] })
   })
+
+  it('同名接口靠同一个路由对象上别的接口（别的方法的也查）定出完整网址，找到前端调用者', async () => {
+    const admin = SCHEMA.replace('export interface paths {', 'export interface paths {\n  "/api/v1/admin/agents": {\n    get: operations["list_agents_api_v1_admin_agents_get"];\n  };')
+    const sameRouter = [{ method: 'GET', path: '/agents' }, { method: 'POST', path: '/agents' }]
+    expect(await calls({ ...files, 'web/src/lib/api/schema.d.ts': admin }, { method: 'GET', path: '/agents', operationIdPrefix: 'list_agents_', sameRouter }))
+      .toEqual(['web/src/app/(main)/my-agents/page.tsx MyAgentsPage /api/v1/agents'])
+  })
 })
diff --git a/vscode/src/codeReader/callTree/endpoint.ts b/vscode/src/codeReader/callTree/endpoint.ts
index 0859870..c932744 100644
--- a/vscode/src/codeReader/callTree/endpoint.ts
+++ b/vscode/src/codeReader/callTree/endpoint.ts
@@ -3,7 +3,7 @@
  * 契约里对不上就交回找到了哪几份契约文件，不猜、不退回去只比网址结尾。
  */
 
-import type { HttpEndpoint, IndexEntry } from '../contract'
+import type { EndpointRoute, HttpEndpoint, IndexEntry } from '../contract'
 import type { IndexedEntry, WorkspaceIndexOf } from '../workspaceIndex'
 import type { OperationEntry } from './openapi'
 import type { RequestEntry } from './requests'
@@ -31,24 +31,50 @@ function isParam(segment: string): boolean {
   return segment.includes('{')
 }
 
-/** 契约路径 full 以后端写的 tail 结尾：字面量段对字面量段要相等，参数段对参数段。 */
-function endsWith(full: readonly string[], tail: readonly string[]): boolean {
+/** 契约路径 full 以后端写的 tail 结尾（字面量段对字面量段要相等，参数段对参数段）时，前面那截挂载前缀，各段用 / 接起来；不是这样结尾时没有。 */
+function mountOf(full: readonly string[], tail: readonly string[]): string | undefined {
   const offset = full.length - tail.length
-  return offset >= 0 && tail.every((segment, i) => isParam(segment) ? isParam(full[offset + i]) : full[offset + i] === segment)
+  const matched = offset >= 0 && tail.every((segment, i) => isParam(segment) ? isParam(full[offset + i]) : full[offset + i] === segment)
+  return matched ? full.slice(0, offset).join('/') : undefined
+}
+
+/** 接口在契约里结尾对得上的各条（方法相同），连同各自的挂载前缀。 */
+function matchesOf(operations: readonly OperationEntry[], route: EndpointRoute): { operation: OperationEntry, mount: string }[] {
+  const tail = segmentsOf(route.path)
+  return operations.flatMap((operation) => {
+    const mount = operation.key === route.method ? mountOf(segmentsOf(operation.path), tail) : undefined
+    return mount === undefined ? [] : [{ operation, mount }]
+  })
+}
+
+/**
+ * 同一个路由对象上的接口挂在同一个前缀下：各接口在契约里对得上的挂载前缀求交集。
+ * 契约里一条都对不上的接口（过期、新加的）不参与；交集是空的、或谁都对不上时是空的。
+ */
+function sharedMounts(operations: readonly OperationEntry[], routes: readonly EndpointRoute[]): Set<string> {
+  let shared: Set<string> | undefined
+  for (const route of routes) {
+    const mounts = new Set(matchesOf(operations, route).map(({ mount }) => mount))
+    if (mounts.size > 0)
+      shared = shared ? new Set([...shared].filter(mount => mounts.has(mount))) : mounts
+  }
+  return shared ?? new Set()
 }
 
 /**
  * 后端路由在契约里可能是哪几条（契约里的完整路径）：方法相同、完整路径以本文件的路径结尾；
- * 结尾对上几条时只留 operationId 以 operationIdPrefix 开头的。正好一条才算对上，剩几条是分不出，一条不剩是没有。
+ * 只留挂载前缀落在同一个路由对象上各接口共同的前缀里的（见 sharedMounts，凑不出共同前缀时不筛）；
+ * 还剩几条时只留 operationId 以 operationIdPrefix 开头的。正好一条才算对上，剩几条是分不出，一条不剩是没有。
  */
 export function routeCandidates(operations: readonly OperationEntry[], endpoint: HttpEndpoint): string[] {
-  const tail = segmentsOf(endpoint.path)
-  const matched = operations.filter(operation => operation.key === endpoint.method && endsWith(segmentsOf(operation.path), tail))
+  const matched = matchesOf(operations, endpoint)
+  const mounts = sharedMounts(operations, [endpoint, ...(endpoint.sameRouter ?? [])])
+  const kept = mounts.size > 0 ? matched.filter(({ mount }) => mounts.has(mount)) : matched
   const prefix = endpoint.operationIdPrefix
-  const candidates = new Set(matched.map(operation => operation.path))
+  const candidates = new Set(kept.map(({ operation }) => operation.path))
   if (candidates.size <= 1 || prefix === undefined)
     return [...candidates]
-  return [...new Set(matched.filter(operation => operation.operationId?.startsWith(prefix)).map(operation => operation.path))]
+  return [...new Set(kept.filter(({ operation }) => operation.operationId?.startsWith(prefix)).map(({ operation }) => operation.path))]
 }
 
 /** 契约路径的各段是不是字面量；从左往右先在字面量上配上的更具体。 */
@@ -83,7 +109,9 @@ export type EndpointCalls = { requests: IndexedEntry<RequestEntry>[] } | { contr
 
 /** 接口卡片的前端调用者：契约里对出完整路径后，同一方法的前端请求里最具体地配上这条路径的那些。 */
 export async function endpointCalls(find: IndexFind, endpoint: HttpEndpoint): Promise<EndpointCalls> {
-  const operations = (await Promise.all(CONTRACT_INDEXES.map(index => find(index, endpoint.method)))).flat().map(({ entry }) => entry)
+  const methods = new Set([endpoint.method, ...(endpoint.sameRouter ?? []).map(route => route.method)])
+  const found = await Promise.all(CONTRACT_INDEXES.flatMap(index => [...methods].map(method => find(index, method))))
+  const operations = found.flat().map(({ entry }) => entry)
   const candidates = routeCandidates(operations, endpoint)
   if (candidates.length !== 1) {
     const all = await Promise.all(CONTRACT_INDEXES.flatMap(index => CONTRACT_METHODS.map(method => find(index, method))))
@@ -91,7 +119,7 @@ export async function endpointCalls(find: IndexFind, endpoint: HttpEndpoint): Pr
     return { contracts, ...(candidates.length > 1 && { ambiguous: candidates.sort() }) }
   }
   const [path] = candidates
-  const paths = operations.map(operation => operation.path)
+  const paths = operations.filter(operation => operation.key === endpoint.method).map(operation => operation.path)
   const requests = await find(REQUESTS_INDEX, endpoint.method)
   return { requests: requests.filter(({ entry }) => requestOperation(paths, entry.path) === path) }
 }
diff --git a/vscode/src/codeReader/contract.ts b/vscode/src/codeReader/contract.ts
index 921a927..0c5d223 100644
--- a/vscode/src/codeReader/contract.ts
+++ b/vscode/src/codeReader/contract.ts
@@ -998,14 +998,20 @@ export interface RuleCard {
   endpoint?: HttpEndpoint
 }
 
-/** 卡片讲的 HTTP 接口。 */
-export interface HttpEndpoint {
+/** 一个 HTTP 接口在这份文件里的写法。 */
+export interface EndpointRoute {
   /** 大写的 HTTP 方法 */
   method: string
   /** 这份文件里写出来的路径，`{参数}` 照写；挂到应用上时别处再叠的前缀不算，宿主按结尾去对完整网址 */
   path: string
-  /** 契约里结尾对上几条时，operationId 以它开头的那条才是（FastAPI 默认的 operationId 以「函数名_」开头） */
+}
+
+/** 卡片讲的 HTTP 接口。 */
+export interface HttpEndpoint extends EndpointRoute {
+  /** 契约里结尾对上几条、挂载前缀也定不下来时，operationId 以它开头的那条才是（FastAPI 默认的 operationId 以「函数名_」开头） */
   operationIdPrefix?: string
+  /** 同一个路由对象上的全部接口（含这一个）：它们挂在同一个前缀下，契约里结尾对上几条时宿主拿它们一起定挂载前缀 */
+  sameRouter?: EndpointRoute[]
 }
 
 /**
diff --git a/vscode/src/codeReader/rules/fastapi.test.ts b/vscode/src/codeReader/rules/fastapi.test.ts
index 3b88714..f6be1b8 100644
--- a/vscode/src/codeReader/rules/fastapi.test.ts
+++ b/vscode/src/codeReader/rules/fastapi.test.ts
@@ -515,10 +515,11 @@ def dynamic_route():
     return None
 `
 
-  it('卡片带上 HTTP 接口：方法、本文件的前缀接装饰器里的路径、operationId 的开头（函数名_）', async () => {
-    expect((await route(source, 'list_agents')).callTree).toEqual({ endpoint: { method: 'GET', path: '/agents', operationIdPrefix: 'list_agents_' } })
-    expect((await route(source, 'get_default_agent')).callTree).toEqual({ endpoint: { method: 'GET', path: '/agents/default', operationIdPrefix: 'get_default_agent_' } })
-    expect((await route(source, 'remove')).callTree).toEqual({ endpoint: { method: 'DELETE', path: '/{agent_id}', operationIdPrefix: 'remove_' } })
+  it('卡片带上 HTTP 接口：方法、本文件的前缀接装饰器里的路径、operationId 的开头（函数名_），和同一个路由对象上的全部接口', async () => {
+    const agents = [{ method: 'GET', path: '/agents' }, { method: 'GET', path: '/agents/default' }]
+    expect((await route(source, 'list_agents')).callTree).toEqual({ endpoint: { method: 'GET', path: '/agents', operationIdPrefix: 'list_agents_', sameRouter: agents } })
+    expect((await route(source, 'get_default_agent')).callTree).toEqual({ endpoint: { method: 'GET', path: '/agents/default', operationIdPrefix: 'get_default_agent_', sameRouter: agents } })
+    expect((await route(source, 'remove')).callTree).toEqual({ endpoint: { method: 'DELETE', path: '/{agent_id}', operationIdPrefix: 'remove_', sameRouter: [{ method: 'DELETE', path: '/{agent_id}' }] } })
   })
 
   it('前缀或路径不是字符串字面量时算不出路径，卡片不带 HTTP 接口，也就没有调用树', async () => {
diff --git a/vscode/src/codeReader/rules/fastapi.ts b/vscode/src/codeReader/rules/fastapi.ts
index 0540eb1..4c9545c 100644
--- a/vscode/src/codeReader/rules/fastapi.ts
+++ b/vscode/src/codeReader/rules/fastapi.ts
@@ -662,7 +662,8 @@ function requestItems(url: Inline[], method: string, placed: readonly Placed[],
   }
 }
 
-function routeCard(block: FunctionBlock, route: Route, env: Env): RuleCard {
+/** 接口卡片；siblings 是同一个路由对象上的全部接口，随卡片讲的 HTTP 接口一起交给宿主定挂载前缀。 */
+function routeCard(block: FunctionBlock, route: Route, env: Env, siblings: readonly RouteOn[]): RuleCard {
   const { context, words } = env
   const { labels } = words
   const { facts } = block
@@ -731,16 +732,29 @@ function routeCard(block: FunctionBlock, route: Route, env: Env): RuleCard {
     ...(facts.name && { defines: range(facts.name) }),
     attributes: { [METHOD_ATTRIBUTE]: route.method },
     absorbs: [],
-    ...(facts.name && endpointOf(route, facts.name.text)),
+    ...(facts.name && endpointOf(route, facts.name.text, siblings)),
   }
 }
 
-/** 卡片讲的 HTTP 接口：前缀和装饰器里的路径都是字符串字面量（或不写）才算得出路径；FastAPI 默认的 operationId 是函数名接完整路径和方法。 */
-function endpointOf(route: Route, fn: string): Pick<RuleCard, 'endpoint'> {
-  const parts = [route.router.prefix, route.path].map(part => part ? stringContent(part)?.text : '')
-  if (parts.includes(undefined))
+/**
+ * 卡片讲的 HTTP 接口，连同同一个路由对象上的全部接口（算不出路径的不算）：算不出这一个的路径时没有。
+ * FastAPI 默认的 operationId 是函数名接完整路径和方法。
+ */
+function endpointOf(route: Route, fn: string, siblings: readonly RouteOn[]): Pick<RuleCard, 'endpoint'> {
+  const path = localPath(route)
+  if (path === undefined)
     return {}
-  return { endpoint: { method: route.method, path: parts.join(''), operationIdPrefix: `${fn}_` } }
+  const sameRouter = siblings.flatMap(({ route: other }) => {
+    const otherPath = localPath(other)
+    return otherPath === undefined ? [] : [{ method: other.method, path: otherPath }]
+  })
+  return { endpoint: { method: route.method, path, operationIdPrefix: `${fn}_`, sameRouter } }
+}
+
+/** 接口在这份文件里写出来的路径（路由对象的前缀接装饰器里的路径）：两段都是字符串字面量（或不写）才算得出。 */
+function localPath(route: Route): string | undefined {
+  const parts = [route.router.prefix, route.path].map(part => part ? stringContent(part)?.text : '')
+  return parts.includes(undefined) ? undefined : parts.join('')
 }
 
 /**
@@ -805,7 +819,7 @@ export const fastapiRule: LibraryRule = {
       for (const decorator of block.facts.decorators) {
         const route = routeOf(decorator, routers)
         if (route)
-          return routeCard(block, route, env)
+          return routeCard(block, route, env, routesOn(root, routers, route.router))
       }
     }
     // 路由对象只认模块顶层的赋值（routersOf），按赋值目标的位置认出是不是这一块
diff --git a/vscode/webview-ui/src/codeReader/types.ts b/vscode/webview-ui/src/codeReader/types.ts
index cdb745e..8c6a9f0 100644
--- a/vscode/webview-ui/src/codeReader/types.ts
+++ b/vscode/webview-ui/src/codeReader/types.ts
@@ -156,7 +156,7 @@ interface BlockViewBase {
 
 /** 一块能看调用树：接口卡片带上它讲的接口（扩展端查前端调用者用，这边只看有没有 callTree）。 */
 export interface CallTreeTarget {
-  endpoint?: { method: string, path: string, operationIdPrefix?: string }
+  endpoint?: { method: string, path: string, operationIdPrefix?: string, sameRouter?: { method: string, path: string }[] }
 }
 
 /**