diff --git a/docs/learnings/sync-behavior.md b/docs/learnings/sync-behavior.md
index bbb3eed..b7532ad 100644
--- a/docs/learnings/sync-behavior.md
+++ b/docs/learnings/sync-behavior.md
@@ -247,6 +247,26 @@ Do not delete the source state mapping or refresh it away before step 2. With
 no source files and no tombstone, promotion refuses the empty-source mirror
 instead of guessing that a full destination wipe was intended.
 
+## Assistant version labels
+
+On an org with assistant versioning, every assistant create or PATCH that
+changes content publishes a new version (`v8`, `v9`, …). The platform records
+no author on a version written with a private API key, so push labels it:
+
+- `versionName`: `gitops <commit>[+dirty] by <actor>`
+- `versionDescription`: the actor, the commit, and the dotted paths of the
+  fields that changed (`model.messages, voice.voiceId`), computed from the
+  dashboard payload before the PATCH and the PATCH response.
+
+The actor is `VAPI_GITOPS_ACTOR` if set, else `github:$GITHUB_ACTOR` in CI,
+else `git config user.email`. It is self-reported, so treat it as an audit
+trail, not proof. `+dirty` means `resources/<org>/` had uncommitted edits, so
+the commit alone does not reproduce the push.
+
+Push skips the label when nothing new was published (identical content is
+deduplicated) and in `--dry-run`. A failed label is a warning, never a failed
+push: the content is already live.
+
 ---
 
 ## Flag cheat sheet
diff --git a/src/push.ts b/src/push.ts
index 3270e9e..2397197 100644
--- a/src/push.ts
+++ b/src/push.ts
@@ -13,6 +13,7 @@ import {
   loadIgnorePatterns,
   OVERWRITE_DRIFT,
   removeExcludedKeys,
+  RESOURCES_DIR,
   STATE_FILE_PATH,
   STRICT_VALIDATION,
   VAPI_BASE_URL,
@@ -39,6 +40,11 @@ import {
   validateNoIgnoredReferences,
   validateResources,
 } from "./validate.ts";
+import {
+  changedFieldPaths,
+  versionActorResolve,
+  versionMetadataBuild,
+} from "./version-metadata.ts";
 
 // Map a resource label to its state-file key. Used for snapshotting —
 // snapshot directories are keyed by the same names the state file uses.
@@ -165,6 +171,45 @@ async function writeBaselineFromResponse(
   }
 }
 
+// Label the version an assistant push just published with who pushed it,
+// from which commit, and which fields changed. Only assistants: they are the
+// only resource whose versions accept metadata. Skips when the push published
+// nothing new (the platform dedups identical content), and never blocks the
+// push: the content is already live, the label is an audit trail.
+async function writeAssistantVersionMetadata(options: {
+  uuid: string;
+  before: unknown;
+  after: unknown;
+}): Promise<void> {
+  const { uuid, before, after } = options;
+  if (DRY_RUN) return;
+  const latestVersionRead = (value: unknown): string | null =>
+    value &&
+    typeof value === "object" &&
+    "latestVersion" in value &&
+    typeof value.latestVersion === "string"
+      ? value.latestVersion
+      : null;
+  const published = latestVersionRead(after);
+  if (!published || published === latestVersionRead(before)) return;
+  const metadata = versionMetadataBuild({
+    actor: versionActorResolve(RESOURCES_DIR),
+    changedPaths: before === undefined ? [] : changedFieldPaths(before, after),
+    created: before === undefined,
+  });
+  try {
+    await vapiRequest("PATCH", `/assistant/${uuid}/versions/${published}`, {
+      ...metadata,
+    });
+    console.log(`   🏷️  ${published}: ${metadata.versionName}`);
+  } catch (err) {
+    console.warn(
+      `   ⚠️  failed to label ${published} of assistant ${uuid}: ` +
+        (err instanceof Error ? err.message : String(err)),
+    );
+  }
+}
+
 async function upsertResourceWithStateRecovery(options: {
   resourceLabel: string;
   resourceId: string;
@@ -197,6 +242,13 @@ async function upsertResourceWithStateRecovery(options: {
     console.log(`  ✨ Creating ${resourceLabel}: ${resourceId}`);
     const result = await vapiRequest("POST", createEndpoint, createPayload);
     await writeBaselineFromResponse(result.id, result, fullState);
+    if (resourceLabel === "assistant") {
+      await writeAssistantVersionMetadata({
+        uuid: result.id,
+        before: undefined,
+        after: result,
+      });
+    }
     return result.id;
   }
 
@@ -210,13 +262,14 @@ async function upsertResourceWithStateRecovery(options: {
   // what would happen, and skipped if no baseline hash.
   // When we successfully fetch the platform payload, snapshot it (and our
   // outgoing payload) so `npm run rollback` has a target.
+  // Platform payload fetched by the drift check, reused for the rollback
+  // snapshot below so we don't fire a second GET at the same endpoint, and
+  // as the "before" side of the version-metadata field diff.
+  let platformPayloadForSnapshot: unknown;
   if (!DRY_RUN) {
     const stateEntry = stateSection[resourceId];
     if (stateEntry) {
       const driftResourceType = RESOURCE_LABEL_TO_TYPE[resourceLabel];
-      // Platform payload fetched by the drift check, reused for the rollback
-      // snapshot below so we don't fire a second GET at the same endpoint.
-      let platformPayloadForSnapshot: unknown;
       // The drift check now owns the full hash computation (platform, local,
       // and baseline all canonicalized via canonical.ts). Push just hands it
       // the full state + resource type — no hash plumbing at the call site.
@@ -341,6 +394,13 @@ async function upsertResourceWithStateRecovery(options: {
     // the freshest possible "last known platform state." Hash it as the new
     // drift baseline so the next push of a further local edit is clean.
     await writeBaselineFromResponse(existingUuid, result, fullState);
+    if (resourceLabel === "assistant" && platformPayloadForSnapshot) {
+      await writeAssistantVersionMetadata({
+        uuid: existingUuid,
+        before: platformPayloadForSnapshot,
+        after: result,
+      });
+    }
     return existingUuid;
   } catch (error) {
     if (!(error instanceof VapiApiError) || error.statusCode !== 404) {
@@ -745,7 +805,8 @@ export function cleanDestinationAssistantIds(destinations: unknown): unknown {
 function countAuthoredAssistantRefs(assistantIds: unknown): number {
   if (!Array.isArray(assistantIds)) return 0;
   return assistantIds.filter(
-    (ref) => typeof ref === "string" && (ref.split("##")[0]?.trim() ?? "") !== "",
+    (ref) =>
+      typeof ref === "string" && (ref.split("##")[0]?.trim() ?? "") !== "",
   ).length;
 }
 
diff --git a/src/types.ts b/src/types.ts
index d285a43..8e8e803 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -94,3 +94,20 @@ export interface OrphanedResource {
   resourceId: string;
   uuid: string;
 }
+
+// Who pushed an assistant version, recorded in its version metadata.
+export interface VersionActor {
+  // Who pushed: the CI actor when set, else the local git identity.
+  name: string;
+  // Short commit SHA of HEAD, or null outside a git checkout.
+  commit: string | null;
+  // True when the pushed files had uncommitted edits, so the commit alone
+  // does not reproduce what was pushed.
+  dirty: boolean;
+}
+
+// Body of PATCH /assistant/:id/versions/:version.
+export interface VersionMetadata {
+  versionName: string;
+  versionDescription: string;
+}
diff --git a/src/version-metadata.ts b/src/version-metadata.ts
new file mode 100644
index 0000000..b231745
--- /dev/null
+++ b/src/version-metadata.ts
@@ -0,0 +1,146 @@
+// Labels the assistant version a push publishes with who pushed it, from
+// which commit, and which fields changed. The platform records no author on
+// versions written with a private API key (createdBy is null), so without
+// this a version published by gitops cannot be traced back to a person.
+//
+// Config-free on purpose (like user-agent.ts): importing config.ts would
+// parse argv and exit, which breaks importing this from tests.
+
+import { execFileSync } from "node:child_process";
+import type { VersionActor, VersionMetadata } from "./types.ts";
+
+// Limits enforced by PATCH /assistant/:id/versions/:version. Longer values
+// are rejected with a 400, so the builder truncates instead.
+const VERSION_NAME_MAX = 80;
+const VERSION_DESCRIPTION_MAX = 500;
+
+// Server-managed keys that differ between any two reads of the same
+// resource. Comparing them would list a change on every push.
+const IGNORED_KEYS = new Set([
+  "id",
+  "orgId",
+  "createdAt",
+  "updatedAt",
+  "latestVersion",
+  "modelDeprecations",
+]);
+
+function isPlainObject(value: unknown): value is Record<string, unknown> {
+  return value !== null && typeof value === "object" && !Array.isArray(value);
+}
+
+function sameValue(a: unknown, b: unknown): boolean {
+  return JSON.stringify(a) === JSON.stringify(b);
+}
+
+// Dotted paths of the fields that differ between two reads of a resource,
+// descending into nested objects up to `maxDepth` levels (so a prompt edit
+// reads `model.messages`, not just `model`). Arrays compare whole.
+export function changedFieldPaths(
+  before: unknown,
+  after: unknown,
+  maxDepth = 2,
+  prefix = "",
+): string[] {
+  if (!isPlainObject(before) || !isPlainObject(after)) {
+    return sameValue(before, after) ? [] : [prefix || "(root)"];
+  }
+
+  const keys = new Set([...Object.keys(before), ...Object.keys(after)]);
+  const paths: string[] = [];
+  for (const key of keys) {
+    if (!prefix && IGNORED_KEYS.has(key)) continue;
+    const path = prefix ? `${prefix}.${key}` : key;
+    const a = before[key];
+    const b = after[key];
+    if (sameValue(a, b)) continue;
+    const depth = path.split(".").length;
+    if (depth < maxDepth && isPlainObject(a) && isPlainObject(b)) {
+      paths.push(...changedFieldPaths(a, b, maxDepth, path));
+    } else {
+      paths.push(path);
+    }
+  }
+  return paths.sort();
+}
+
+function gitRead(args: string[]): string | null {
+  try {
+    const out = execFileSync("git", args, {
+      encoding: "utf-8",
+      stdio: ["ignore", "pipe", "ignore"],
+    }).trim();
+    return out || null;
+  } catch {
+    return null;
+  }
+}
+
+// Self-reported identity: git config and GITHUB_ACTOR are whatever the
+// pusher's environment says. Good for an audit trail between colleagues,
+// not proof against a pusher who sets them deliberately.
+export function versionActorResolve(
+  resourcesDir: string,
+  env: NodeJS.ProcessEnv = process.env,
+): VersionActor {
+  const name =
+    env.VAPI_GITOPS_ACTOR ||
+    (env.GITHUB_ACTOR ? `github:${env.GITHUB_ACTOR}` : null) ||
+    gitRead(["config", "user.email"]) ||
+    gitRead(["config", "user.name"]) ||
+    "unknown";
+  const commit = gitRead(["rev-parse", "--short", "HEAD"]);
+  const dirty =
+    commit !== null &&
+    gitRead(["status", "--porcelain", "--", resourcesDir]) !== null;
+  return { name, commit, dirty };
+}
+
+function truncate(value: string, max: number): string {
+  return value.length <= max ? value : `${value.slice(0, max - 1)}…`;
+}
+
+// Lists as many changed paths as fit in the description limit, then
+// "+N more" so a large change never pushes the actor line out.
+function changedFieldsLine(paths: string[], budget: number): string {
+  if (paths.length === 0) return "Changed: (no field-level change detected)";
+  const head = "Changed: ";
+  let line = head;
+  for (let i = 0; i < paths.length; i++) {
+    const remaining = paths.length - i - 1;
+    const sep = i === 0 ? "" : ", ";
+    const tail = remaining > 0 ? ` (+${remaining} more)` : "";
+    const candidate = `${line}${sep}${paths[i]}`;
+    if (candidate.length + tail.length > budget) {
+      return `${line} (+${paths.length - i} more)`;
+    }
+    line = candidate;
+  }
+  return line;
+}
+
+export function versionMetadataBuild(args: {
+  actor: VersionActor;
+  changedPaths: string[];
+  created: boolean;
+}): VersionMetadata {
+  const { actor, changedPaths, created } = args;
+  const commit = actor.commit
+    ? `${actor.commit}${actor.dirty ? "+dirty" : ""}`
+    : "no-commit";
+  const versionName = truncate(
+    `gitops ${commit} by ${actor.name}`,
+    VERSION_NAME_MAX,
+  );
+  const header = `Pushed by ${actor.name} from commit ${commit} via vapi-gitops.`;
+  const body = created
+    ? "Created by gitops."
+    : changedFieldsLine(
+        changedPaths,
+        VERSION_DESCRIPTION_MAX - header.length - 1,
+      );
+  return {
+    versionName,
+    versionDescription: truncate(`${header}\n${body}`, VERSION_DESCRIPTION_MAX),
+  };
+}
diff --git a/tests/version-metadata.test.ts b/tests/version-metadata.test.ts
new file mode 100644
index 0000000..815baaf
--- /dev/null
+++ b/tests/version-metadata.test.ts
@@ -0,0 +1,119 @@
+import assert from "node:assert/strict";
+import test from "node:test";
+import {
+  changedFieldPaths,
+  versionActorResolve,
+  versionMetadataBuild,
+} from "../src/version-metadata.ts";
+
+const BASE = {
+  id: "a1",
+  orgId: "o1",
+  name: "Support agent",
+  updatedAt: "2026-10-01T00:00:00.000Z",
+  latestVersion: "v7",
+  model: {
+    provider: "openai",
+    model: "gpt-4.1",
+    messages: [{ role: "system", content: "old prompt" }],
+  },
+  voice: { provider: "11labs", voiceId: "abc" },
+};
+
+test("changedFieldPaths names the nested field a prompt edit touched", () => {
+  const after = {
+    ...BASE,
+    model: {
+      ...BASE.model,
+      messages: [{ role: "system", content: "new prompt" }],
+    },
+  };
+  assert.deepEqual(changedFieldPaths(BASE, after), ["model.messages"]);
+});
+
+test("changedFieldPaths ignores server-managed keys that move on every write", () => {
+  const after = {
+    ...BASE,
+    updatedAt: "2026-10-06T00:00:00.000Z",
+    latestVersion: "v8",
+  };
+  assert.deepEqual(changedFieldPaths(BASE, after), []);
+});
+
+test("changedFieldPaths lists added and removed keys", () => {
+  const { voice: _voice, ...withoutVoice } = BASE;
+  const after = { ...withoutVoice, firstMessage: "Hi" };
+  assert.deepEqual(changedFieldPaths(BASE, after), ["firstMessage", "voice"]);
+});
+
+test("changedFieldPaths stops descending at maxDepth", () => {
+  const after = {
+    ...BASE,
+    model: { ...BASE.model, provider: "anthropic", model: "claude-sonnet" },
+  };
+  assert.deepEqual(changedFieldPaths(BASE, after, 1), ["model"]);
+});
+
+test("versionMetadataBuild puts the actor and commit in the name and description", () => {
+  const metadata = versionMetadataBuild({
+    actor: { name: "dev@example.com", commit: "abc1234", dirty: false },
+    changedPaths: ["model.messages", "voice.voiceId"],
+    created: false,
+  });
+  assert.deepEqual(metadata, {
+    versionName: "gitops abc1234 by dev@example.com",
+    versionDescription:
+      "Pushed by dev@example.com from commit abc1234 via vapi-gitops.\n" +
+      "Changed: model.messages, voice.voiceId",
+  });
+});
+
+test("versionMetadataBuild marks a push with uncommitted edits as dirty", () => {
+  const metadata = versionMetadataBuild({
+    actor: { name: "dev@example.com", commit: "abc1234", dirty: true },
+    changedPaths: ["name"],
+    created: false,
+  });
+  assert.equal(metadata.versionName, "gitops abc1234+dirty by dev@example.com");
+});
+
+test("versionMetadataBuild fits a large change in the API limits with a +N more tail", () => {
+  const changedPaths = Array.from(
+    { length: 60 },
+    (_, i) => `analysisPlan.field${i}`,
+  );
+  const metadata = versionMetadataBuild({
+    actor: { name: "x".repeat(120), commit: "abc1234", dirty: false },
+    changedPaths,
+    created: false,
+  });
+  assert.ok(metadata.versionName.length <= 80);
+  assert.ok(metadata.versionDescription.length <= 500);
+  assert.match(metadata.versionDescription, /\(\+\d+ more\)$/);
+});
+
+test("versionMetadataBuild says created for a first push", () => {
+  const metadata = versionMetadataBuild({
+    actor: { name: "dev@example.com", commit: null, dirty: false },
+    changedPaths: [],
+    created: true,
+  });
+  assert.equal(
+    metadata.versionDescription,
+    "Pushed by dev@example.com from commit no-commit via vapi-gitops.\n" +
+      "Created by gitops.",
+  );
+});
+
+test("versionActorResolve prefers an explicit actor over the CI and git identity", () => {
+  const actor = versionActorResolve("resources", {
+    VAPI_GITOPS_ACTOR: "release-bot",
+    GITHUB_ACTOR: "someone",
+  });
+  assert.equal(actor.name, "release-bot");
+});
+
+test("versionActorResolve uses the GitHub actor in CI", () => {
+  const actor = versionActorResolve("resources", { GITHUB_ACTOR: "someone" });
+  assert.equal(actor.name, "github:someone");
+});