diff --git a/src/capability-language/development-sources.ts b/src/capability-language/development-sources.ts
index 97e8d26..e6d540a 100644
--- a/src/capability-language/development-sources.ts
+++ b/src/capability-language/development-sources.ts
@@ -16,8 +16,11 @@ export async function prepareDevelopmentSources(options: {
   directory: string;
   cacheDirectory: string;
   locations?: Record<string, string>;
+  workspaceId?: string;
 }) {
   const source = workspaceSourcePin(options.source);
+  if (options.workspaceId !== undefined && !/^[0-9a-f]{8}-(?:[0-9a-f]{4}-){3}[0-9a-f]{12}$/.test(options.workspaceId))
+    throw Error("Development source binding requires a Workspace UUID");
   const destination = path.resolve(options.directory);
   const cache = path.resolve(options.cacheDirectory);
   if (cache === destination || cache.startsWith(destination + path.sep))
@@ -43,7 +46,8 @@ export async function prepareDevelopmentSources(options: {
   const parent = path.dirname(destination);
   await mkdir(parent, { recursive: true });
   const staging = await mkdtemp(path.join(parent, ".development-sources-"));
-  const workspaceId = randomUUID();
+  // This local association does not create or grant access to a hosted Graph.
+  const workspaceId = options.workspaceId ?? randomUUID();
   try {
     const resources = [];
     for (const entry of closure.resources) {
diff --git a/src/capability-language/tool-cli.ts b/src/capability-language/tool-cli.ts
index 41a382d..7de8d1b 100644
--- a/src/capability-language/tool-cli.ts
+++ b/src/capability-language/tool-cli.ts
@@ -73,7 +73,7 @@ const main = async () => {
           "--dir",
           ...(args[1] !== "restore" ? ["--locations"] : []),
           ...(args[1] === "checkout" ? ["--repository-prefix"] : []),
-          ...(args[1] === "develop" ? ["--cache"] : []),
+          ...(args[1] === "develop" ? ["--cache", "--workspace-id"] : []),
           ...(args[1] === "backup" ? ["--output"] : []),
         ].includes(args[i]) ||
         !args[i + 1] ||
@@ -100,7 +100,11 @@ const main = async () => {
     if (args[1] === "develop") {
       if (!flags.get("--cache")) throw Error("source develop requires --cache DIRECTORY");
       const { prepareDevelopmentSources } = await import("./development-sources.js");
-      result = await prepareDevelopmentSources({ ...options, cacheDirectory: path.resolve(flags.get("--cache")!) });
+      result = await prepareDevelopmentSources({
+        ...options,
+        cacheDirectory: path.resolve(flags.get("--cache")!),
+        ...(flags.has("--workspace-id") ? { workspaceId: flags.get("--workspace-id")! } : {}),
+      });
     } else if (args[1] === "backup") {
       if (!flags.get("--output")) throw Error("source backup requires --output DIRECTORY");
       const { backupWorkspaceSources } = await import("./source-backup.js");
diff --git a/test/source-closure.test.ts b/test/source-closure.test.ts
index 4fb8c3e..3cb19d1 100644
--- a/test/source-closure.test.ts
+++ b/test/source-closure.test.ts
@@ -172,6 +172,27 @@ test("exact source closure recovers through explicitly selected bundles, preserv
     directory: path.join(temporary, "b"),
   });
   assert.notEqual(a.workspaceId, b.workspaceId);
+  const assigned = "f8f2f8a3-328c-45a2-847a-31869ad28ce7";
+  const c = await prepareDevelopmentSources({
+    source: root,
+    cacheDirectory: directory,
+    directory: path.join(temporary, "assigned"),
+    workspaceId: assigned,
+  });
+  assert.equal(c.workspaceId, assigned);
+  assert.equal(
+    JSON.parse(await readFile(path.join(c.directory, ".quixos/resource-graph.json"), "utf8")).workspaceId,
+    assigned,
+  );
+  await assert.rejects(
+    prepareDevelopmentSources({
+      source: root,
+      cacheDirectory: directory,
+      directory: path.join(temporary, "invalid"),
+      workspaceId: "not-a-workspace",
+    }),
+    /Workspace UUID/,
+  );
   const aRoot = path.join(a.directory, "root"),
     bRoot = path.join(b.directory, "root");
   assert.equal((await exec("git", ["remote", "get-url", "origin"], { cwd: aRoot })).stdout.trim(), root.repository);