diff --git a/package-lock.json b/package-lock.json
index 771cf514..a16d4c4e 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "@treeseed/api",
-  "version": "0.8.0-rc.61",
+  "version": "0.8.0-rc.62",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "@treeseed/api",
-      "version": "0.8.0-rc.61",
+      "version": "0.8.0-rc.62",
       "license": "AGPL-3.0-only",
       "dependencies": {
         "@modelcontextprotocol/core": "2.0.0",
diff --git a/package.json b/package.json
index d6dfeb25..ce08a03d 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@treeseed/api",
-  "version": "0.8.0-rc.61",
+  "version": "0.8.0-rc.62",
   "description": "TreeSeed control-plane API and operations runner.",
   "license": "AGPL-3.0-only",
   "repository": {
diff --git a/src/api/store/teams/contracts/managed-library/ensure-managed-team-library-project.ts b/src/api/store/teams/contracts/managed-library/ensure-managed-team-library-project.ts
index 84d7fe0a..ff04edd9 100644
--- a/src/api/store/teams/contracts/managed-library/ensure-managed-team-library-project.ts
+++ b/src/api/store/teams/contracts/managed-library/ensure-managed-team-library-project.ts
@@ -1,7 +1,10 @@
+import { createHash } from 'node:crypto';
 import { ControlPlaneStore,isoNow,parseJson } from '../../../../persistence/store.ts';
 
 export const MANAGED_TEAM_PROJECT_SLUG='team';
 export const MANAGED_TEAM_PROJECT_KIND='system-team-library';
+export const managedTeamLibraryRepositoryName=(teamId:string)=>`team-library-${createHash('sha256').update(teamId).digest('hex').slice(0,12)}`;
+export const isManagedTeamLibraryRepositoryName=(teamId:string,name:string)=>name==='team-library'||name===managedTeamLibraryRepositoryName(teamId);
 
 export async function ensureManagedTeamLibraryProjectMethod(this:ControlPlaneStore,teamId:string){
 	await this.ensureInitialized();
@@ -10,8 +13,9 @@ export async function ensureManagedTeamLibraryProjectMethod(this:ControlPlaneSto
 		if(existing.metadata?.kind!==MANAGED_TEAM_PROJECT_KIND||existing.metadata?.systemManaged!==true)throw new Error('The reserved team project slug is occupied by a user-managed project.');
 		return existing;
 	}
+	const repositoryName=managedTeamLibraryRepositoryName(teamId);
 	const details=await this.createProject(teamId,{slug:MANAGED_TEAM_PROJECT_SLUG,name:'Team Library',description:'System-managed shared knowledge for this team.',metadata:{kind:MANAGED_TEAM_PROJECT_KIND,systemManaged:true,
-		libraryOnly:true,library:{repositoryName:'team-library',defaultBranch:'main',integrationBranch:'staging',status:'provisioning'},
+		libraryOnly:true,library:{repositoryName,defaultBranch:'main',integrationBranch:'staging',status:'provisioning'},
 		inventory:{status:'active'},provisioning:{state:'pending',requiredFiles:['README.md','objectives/core']}}});
 	const project=details?.project??details,teamRow=await this.first('SELECT metadata_json FROM teams WHERE id = ? LIMIT 1',[teamId]);
 	const metadata=parseJson(teamRow?.metadata_json,{});metadata.teamLibrary={projectId:project.id,projectSlug:MANAGED_TEAM_PROJECT_SLUG,state:'provisioning'};
diff --git a/src/api/teams/managed-team-library-service.ts b/src/api/teams/managed-team-library-service.ts
index 6067ee26..76b05e22 100644
--- a/src/api/teams/managed-team-library-service.ts
+++ b/src/api/teams/managed-team-library-service.ts
@@ -2,6 +2,7 @@ import { ensureProjectKnowledgeBinding } from '../../control-plane/seeds/apply-s
 import { reconcileLibraryProvider } from '../../control-plane/seeds/apply-support/projects/projects-core/library-provider-reconciliation.ts';
 import { createR2PublicationClient } from '../providers/cloudflare/r2-publication-client.ts';
 import { enqueueTreeDxCommitReplication } from '../capacity/services/treedx/repositories/treedx-commit-replication.ts';
+import { isManagedTeamLibraryRepositoryName,managedTeamLibraryRepositoryName } from '../store/teams/contracts/managed-library/ensure-managed-team-library-project.ts';
 
 const text=(...values:unknown[])=>values.find((value)=>typeof value==='string'&&value.trim())?.toString().trim()??'';
 const record=(value:unknown):Record<string,unknown>=>value&&typeof value==='object'&&!Array.isArray(value)?value as Record<string,unknown>:{};
@@ -35,8 +36,10 @@ export async function reconcileManagedTeamLibrary(store:any,teamId:string,env:No
 		for(const candidate of projects)for(const repository of await store.listHubRepositories(String(candidate.id)))if(repository.owner){owner=String(repository.owner);break;}
 	}
 	if(!owner)throw new Error('A GitHub library owner must be configured before the managed Team Library can be provisioned.');
-	const provider=await reconcileLibraryProvider({store,teamId,projectId:String(project.id),projectSlug:'team',owner,name:'team-library',visibility:'private',lifecycle:'create-or-adopt',env,fetchImpl:store.config?.fetchImpl,seedFiles});
-	const binding=await ensureProjectKnowledgeBinding({store,projectId:String(project.id),teamId,projectSlug:'team',libraryRoot:'.',libraryRef:'refs/remotes/origin/staging',libraryRepositoryUrl:`https://github.com/${owner}/team-library.git`,libraryDefaultBranch:'main',libraryCredentialId:provider.credentialId,expectedUpstreamHeads:provider.heads,env});
+	const projectLibrary=record(record(project.metadata).library),repositoryName=text(projectLibrary.repositoryName,managedTeamLibraryRepositoryName(teamId));
+	if(!isManagedTeamLibraryRepositoryName(teamId,repositoryName))throw new Error('Managed Team Library repository identity does not match its owning team.');
+	const provider=await reconcileLibraryProvider({store,teamId,projectId:String(project.id),projectSlug:'team',owner,name:repositoryName,visibility:'private',lifecycle:'create-or-adopt',env,fetchImpl:store.config?.fetchImpl,seedFiles});
+	const binding=await ensureProjectKnowledgeBinding({store,projectId:String(project.id),teamId,projectSlug:'team',libraryRoot:'.',libraryRef:'refs/remotes/origin/staging',libraryRepositoryUrl:`https://github.com/${owner}/${repositoryName}.git`,libraryDefaultBranch:'main',libraryCredentialId:provider.credentialId,expectedUpstreamHeads:provider.heads,env});
 	const now=new Date().toISOString();
 	await enqueueTreeDxCommitReplication(store,{teamId,projectId:String(project.id),commitSha:binding.resolvedRef,sourceRef:binding.sourceRef,createdAt:now});
 	const replication=await store.first(`SELECT status,r2_status,r2_receipt_json FROM treedx_commit_replications
@@ -46,11 +49,11 @@ export async function reconcileManagedTeamLibrary(store:any,teamId:string,env:No
 		&&r2Receipt.schemaVersion==='treeseed.treedx-r2-file-mirror/v2'&&r2Receipt.commitSha===binding.resolvedRef;
 	const provisioning=mirrorReady?{state:'known-good',completedAt:now,requiredFiles:['README.md','objectives/core']}
 		:{state:'replicating',updatedAt:now,requiredFiles:['README.md','objectives/core']};
-	const projectMetadata={...record(project.metadata),library:{...record(record(project.metadata).library),status:mirrorReady?'known-good':'replicating',owner,repositoryName:'team-library',heads:provider.heads},provisioning};
+	const projectMetadata={...record(project.metadata),library:{...projectLibrary,status:mirrorReady?'known-good':'replicating',owner,repositoryName,heads:provider.heads},provisioning};
 	await store.run('UPDATE projects SET metadata_json = ?, updated_at = ? WHERE id = ?',[JSON.stringify(projectMetadata),now,project.id]);
-	const teamMetadata={...metadata,teamLibrary:{projectId:project.id,projectSlug:'team',state:mirrorReady?'known-good':'replicating',repository:`${owner}/team-library`,repositoryId:binding.repositoryId}};
+	const teamMetadata={...metadata,teamLibrary:{projectId:project.id,projectSlug:'team',state:mirrorReady?'known-good':'replicating',repository:`${owner}/${repositoryName}`,repositoryName,repositoryId:binding.repositoryId}};
 	await store.run('UPDATE teams SET metadata_json = ?, updated_at = ? WHERE id = ?',[JSON.stringify(teamMetadata),now,teamId]);
-	return {teamId,projectId:project.id,repository:`${owner}/team-library`,state:mirrorReady?'known-good':'replicating',...binding};
+	return {teamId,projectId:project.id,repository:`${owner}/${repositoryName}`,state:mirrorReady?'known-good':'replicating',...binding};
 }
 
 export async function markManagedTeamLibraryMirrorKnownGood(store:any,input:{teamId:string;projectId:string;commitSha:string;r2Receipt:unknown}) {
@@ -91,8 +94,8 @@ export async function deleteManagedTeamLibraryResources(input:{teamId:string;pro
 	if(input.project.metadata?.kind!=='system-team-library'||input.project.metadata?.systemManaged!==true)
 		throw new Error('Managed Team Library cleanup requires the protected system project.');
 	const env=input.env??process.env,fetchImpl=input.fetchImpl??fetch,library=record(input.project.metadata?.library);
-	const owner=text(library.owner),name=text(library.repositoryName,'team-library'),token=text(env.TREESEED_GITHUB_TOKEN);
-	if(!owner||name!=='team-library'||!token)throw new Error('Managed Team Library GitHub deletion authority is unavailable.');
+	const owner=text(library.owner),name=text(library.repositoryName),token=text(env.TREESEED_GITHUB_TOKEN);
+	if(!owner||!isManagedTeamLibraryRepositoryName(input.teamId,name)||!token)throw new Error('Managed Team Library GitHub deletion authority is unavailable.');
 	const response=await fetchImpl(`https://api.github.com/repos/${encodeURIComponent(owner)}/${encodeURIComponent(name)}`,{
 		method:'DELETE',headers:{accept:'application/vnd.github+json',authorization:`Bearer ${token}`,'user-agent':'treeseed-team-library-deleter','x-github-api-version':'2022-11-28'},
 	});
diff --git a/tests/unit/control-plane/teams/managed-team-library-deletion.test.ts b/tests/unit/control-plane/teams/managed-team-library-deletion.test.ts
index 0ae040f5..9775eb26 100644
--- a/tests/unit/control-plane/teams/managed-team-library-deletion.test.ts
+++ b/tests/unit/control-plane/teams/managed-team-library-deletion.test.ts
@@ -1,8 +1,10 @@
 import { describe, expect, it, vi } from 'vitest';
 import { deleteManagedTeamLibraryResources } from '../../../../src/api/teams/managed-team-library-service.ts';
+import { isManagedTeamLibraryRepositoryName,managedTeamLibraryRepositoryName } from '../../../../src/api/store/teams/contracts/managed-library/ensure-managed-team-library-project.ts';
 
 describe('managed Team Library deletion', () => {
 	it('deletes the exact GitHub repository and both team-scoped R2 prefixes', async () => {
+		const repositoryName=managedTeamLibraryRepositoryName('team-1');
 		const requests:string[]=[];
 		const fetchImpl=vi.fn(async (input:string|URL|Request,init?:RequestInit) => {
 			const url=String(input);requests.push(`${init?.method??'GET'} ${url}`);
@@ -10,13 +12,24 @@ describe('managed Team Library deletion', () => {
 			if((init?.method??'GET')==='GET')return new Response('<ListBucketResult><IsTruncated>false</IsTruncated></ListBucketResult>',{status:200});
 			return new Response(null,{status:204});
 		});
-		const result=await deleteManagedTeamLibraryResources({teamId:'team-1',project:{id:'project-team',metadata:{kind:'system-team-library',systemManaged:true,library:{owner:'treeseed-ai',repositoryName:'team-library'}}},
+		const result=await deleteManagedTeamLibraryResources({teamId:'team-1',project:{id:'project-team',metadata:{kind:'system-team-library',systemManaged:true,library:{owner:'treeseed-ai',repositoryName}}},
 			env:{TREESEED_GITHUB_TOKEN:'github-token',TREESEED_CLOUDFLARE_ACCOUNT_ID:'account',TREESEED_CONTENT_BUCKET_NAME:'treeseed-dev-library',TREESEED_R2_ACCESS_KEY_ID:'access',TREESEED_R2_SECRET_ACCESS_KEY:'secret'},fetchImpl:fetchImpl as typeof fetch});
-		expect(result).toEqual(expect.objectContaining({teamId:'team-1',github:{repository:'treeseed-ai/team-library',deleted:true,alreadyAbsent:false},r2:expect.objectContaining({deletedObjects:0})}));
-		expect(requests.some((request)=>request.startsWith('DELETE https://api.github.com/repos/treeseed-ai/team-library'))).toBe(true);
+		expect(result).toEqual(expect.objectContaining({teamId:'team-1',github:{repository:`treeseed-ai/${repositoryName}`,deleted:true,alreadyAbsent:false},r2:expect.objectContaining({deletedObjects:0})}));
+		expect(requests.some((request)=>request.startsWith(`DELETE https://api.github.com/repos/treeseed-ai/${repositoryName}`))).toBe(true);
 		expect(requests.filter((request)=>request.startsWith('GET https://account.r2.cloudflarestorage.com/treeseed-dev-library/')).length).toBe(2);
 	});
 
+	it('derives stable collision-free identities and retains only the recorded legacy exception', async () => {
+		const first=managedTeamLibraryRepositoryName('team-1'),second=managedTeamLibraryRepositoryName('team-2');
+		expect(first).toMatch(/^team-library-[a-f0-9]{12}$/u);
+		expect(first).not.toBe(second);
+		expect(isManagedTeamLibraryRepositoryName('team-1',first)).toBe(true);
+		expect(isManagedTeamLibraryRepositoryName('team-1','team-library')).toBe(true);
+		expect(isManagedTeamLibraryRepositoryName('team-1',second)).toBe(false);
+		await expect(deleteManagedTeamLibraryResources({teamId:'team-1',project:{id:'project-team',metadata:{kind:'system-team-library',systemManaged:true,library:{owner:'treeseed-ai',repositoryName:second}}},
+			env:{TREESEED_GITHUB_TOKEN:'github-token'}})).rejects.toThrow('GitHub deletion authority is unavailable');
+	});
+
 	it('refuses to delete a normal project', async () => {
 		await expect(deleteManagedTeamLibraryResources({teamId:'team-1',project:{id:'project-1',metadata:{}},env:{}}))
 			.rejects.toThrow('protected system project');