diff --git a/packages/junior-github/SETUP.md b/packages/junior-github/SETUP.md
index 8451919563..34dd5c3685 100644
--- a/packages/junior-github/SETUP.md
+++ b/packages/junior-github/SETUP.md
@@ -156,7 +156,7 @@ Use `additionalUserScopes` only when a human-identity integration flow requires
 - The plugin classifies GitHub traffic from the forwarded HTTP request. Reads use `installation-read`, while `GET /user` uses `user-read`. Allowlisted App-owned mutations and Git smart-HTTP pushes use `installation-write`. User-attachment uploads to `uploads.github.com/user-attachments/assets` use `user-write`. Unknown REST writes and GraphQL mutations are denied.
 - `user-read` and explicitly human `user-write` operations require the actor, or an explicitly delegated user subject, to authorize the GitHub App through the private OAuth flow. Junior-owned issue, pull request, review, inline review comment, and branch operations do not fall back to user OAuth.
 - Headless resource-event turns use the `resource-event` system actor and may receive the same installation grants. This lets Junior respond to subscribed pull request events by committing and pushing fixes without inheriting a subscriber's OAuth credential.
-- Git commits use Junior as author and committer. Resolvable human run actors are credited once with `Co-Authored-By` trailers.
+- Git commits use Junior as author and committer. Resolvable human run actors are credited once with `Co-Authored-By` trailers. When the current actor has a linked GitHub identity, Junior prefers a GitHub noreply address so external automation can resolve a login for assignment.
 - Installation credential leases are cached on the host by grant name and reused across sandboxes until near expiry. User grants stay actor-scoped. Upstream 403 after injection clears the cached lease, issues a new token, and retries the hop once before recording permission denied.
 - Sandbox does not receive raw tokens via env; host applies Authorization header transforms for GitHub API and upload calls.
 
@@ -187,7 +187,7 @@ The plugin uses installation credentials for read-only GitHub traffic, workflow
 
 Committing and pushing code uses more than one GitHub surface:
 
-- Creating the local Git commit does not call GitHub. Junior sets the GitHub App bot as author and committer and credits resolvable human actors with `Co-Authored-By` trailers.
+- Creating the local Git commit does not call GitHub. Junior sets the GitHub App bot as author and committer and credits resolvable human actors with `Co-Authored-By` trailers, preferring a linked GitHub noreply email for the current actor when present.
 - Pushing a branch with Git smart HTTP (`git push`) uses the `installation-write` grant and requires the App installation to have `Contents: write`. Workflow-file changes also require the installation to have `Workflows: write`.
 - The smart-HTTP classifier does not distinguish Junior-managed branches or independently detect force updates or ref deletion. Use GitHub branch protection and limit the App installation to repositories where Junior may push.
 - REST Git database and ref writes are denied by the current write allowlist. Use Git smart HTTP (`git push`) for branch updates instead.
diff --git a/packages/junior-github/src/git-config.ts b/packages/junior-github/src/git-config.ts
index 4acc1c5ed4..340fd7e5c1 100644
--- a/packages/junior-github/src/git-config.ts
+++ b/packages/junior-github/src/git-config.ts
@@ -4,6 +4,7 @@
 import type {
   Actor,
   SandboxPrepareHookContext,
+  User,
 } from "@sentry/junior-plugin-api";
 
 function cleanIdentityPart(value: unknown): string {
@@ -55,6 +56,28 @@ function actorEmail(actor?: Actor): string | undefined {
   return /^[^\s@<>]+@[^\s@<>]+\.[^\s@<>]+$/.test(email) ? email : undefined;
 }
 
+/**
+ * Prefer a GitHub noreply address when the linked user has a GitHub identity.
+ * That form encodes a resolvable login for downstream assignee automation.
+ */
+function githubNoreplyEmail(user?: User): string | undefined {
+  for (const identity of user?.identities ?? []) {
+    if (identity.provider !== "github") {
+      continue;
+    }
+    const login = cleanIdentityPart(identity.handle);
+    const userId = cleanIdentityPart(identity.providerSubjectId);
+    if (!login || login.toLowerCase().endsWith("[bot]")) {
+      continue;
+    }
+    if (/^[1-9]\d*$/.test(userId)) {
+      return `${userId}+${login}@users.noreply.github.com`;
+    }
+    return `${login}@users.noreply.github.com`;
+  }
+  return undefined;
+}
+
 /**
  * Stable identity key for an actor, matching the distinctness rule
  * `instructionActors` uses to build `run.actors` (identity ids only, never
@@ -78,14 +101,23 @@ function actorIdentityKey(actor: Actor): string {
  * denying the commit. Dedupes by identity and resolved email so the same human
  * under two display profiles, or an actor matching the bot identity, only ever
  * produces one line.
+ *
+ * When the current actor has a linked GitHub identity, prefer that noreply
+ * address so external automation can resolve a login for assignment.
  */
 export function additionalActorCoauthorTrailers(args: {
   actors?: Actor[];
   botEmail: string;
+  /** Linked user for the current run actor, when already resolved. */
+  currentUser?: User;
 }): string[] {
   if (!args.actors || args.actors.length === 0) {
     return [];
   }
+  const currentActorKey = args.actors[0]
+    ? actorIdentityKey(args.actors[0])
+    : undefined;
+  const currentNoreply = githubNoreplyEmail(args.currentUser);
   const seenEmails = new Set<string>([args.botEmail.toLowerCase()]);
   const seenActors = new Set<string>();
   const trailers: string[] = [];
@@ -95,7 +127,9 @@ export function additionalActorCoauthorTrailers(args: {
       continue;
     }
     const name = actorName(candidate);
-    const email = actorEmail(candidate);
+    const email =
+      (currentActorKey === actorKey ? currentNoreply : undefined) ||
+      actorEmail(candidate);
     if (!name || !email) {
       continue;
     }
diff --git a/packages/junior-github/src/plugin.ts b/packages/junior-github/src/plugin.ts
index 5cfc3de5a5..4af9a00ed4 100644
--- a/packages/junior-github/src/plugin.ts
+++ b/packages/junior-github/src/plugin.ts
@@ -327,7 +327,7 @@ export function githubPlugin(
         await configureGit(ctx, "credential.helper", "");
         await configureGit(ctx, "http.emptyAuth", "true");
       },
-      beforeToolExecute(ctx) {
+      async beforeToolExecute(ctx) {
         if (ctx.tool.name !== "bash") {
           return;
         }
@@ -339,9 +339,18 @@ export function githubPlugin(
         ctx.env.set("JUNIOR_GIT_AUTHOR_EMAIL", botEmail);
         ctx.env.set("GIT_COMMITTER_NAME", botName);
         ctx.env.set("GIT_COMMITTER_EMAIL", botEmail);
+        let currentUser;
+        if (ctx.actor) {
+          try {
+            currentUser = (await ctx.users.resolveActor())?.user;
+          } catch {
+            currentUser = undefined;
+          }
+        }
         const actorTrailers = additionalActorCoauthorTrailers({
           actors: [...(ctx.actor ? [ctx.actor] : []), ...(ctx.actors ?? [])],
           botEmail,
+          currentUser,
         });
         ctx.env.set(
           "JUNIOR_GIT_ACTOR_COAUTHOR_TRAILERS",
diff --git a/packages/junior-github/tests/github-plugin.test.ts b/packages/junior-github/tests/github-plugin.test.ts
index 1e4e7afe49..f05c1d058f 100644
--- a/packages/junior-github/tests/github-plugin.test.ts
+++ b/packages/junior-github/tests/github-plugin.test.ts
@@ -64,7 +64,11 @@ type TestActor = {
   userName?: string;
 };
 
-function beforeToolContext(actor: TestActor, actors?: TestActor[]) {
+function beforeToolContext(
+  actor: TestActor,
+  actors?: TestActor[],
+  resolveActor?: ToolRegistrationHookContext["users"]["resolveActor"],
+) {
   const env: Record<string, string> = {};
   let denial: string | undefined;
 
@@ -93,6 +97,9 @@ function beforeToolContext(actor: TestActor, actors?: TestActor[]) {
       db,
       actor,
       ...(actors ? { actors } : undefined),
+      users: {
+        resolveActor: resolveActor ?? (async () => undefined),
+      },
       tool: {
         input: { command: "git commit -m test" },
         name: "bash",
@@ -3486,7 +3493,7 @@ Conversation: \`local:test:old-conversation\`
     );
   });
 
-  it("throws GitHubPluginSetupError when bot identity environment variables are missing", () => {
+  it("throws GitHubPluginSetupError when bot identity environment variables are missing", async () => {
     delete process.env.GITHUB_APP_BOT_NAME;
     delete process.env.GITHUB_APP_BOT_EMAIL;
 
@@ -3498,12 +3505,12 @@ Conversation: \`local:test:old-conversation\`
       userName: "dcramer",
     });
 
-    expect(() => {
-      plugin.hooks?.beforeToolExecute?.(before.ctx as never);
-    }).toThrow("Missing GITHUB_APP_BOT_NAME");
+    await expect(
+      plugin.hooks?.beforeToolExecute?.(before.ctx as never),
+    ).rejects.toThrow("Missing GITHUB_APP_BOT_NAME");
   });
 
-  it("injects Junior author and committer identity", () => {
+  it("injects Junior author and committer identity", async () => {
     process.env.GITHUB_APP_BOT_NAME = "sentry-junior[bot]";
     process.env.GITHUB_APP_BOT_EMAIL = "bot@example.com";
 
@@ -3515,7 +3522,7 @@ Conversation: \`local:test:old-conversation\`
       userName: "dcramer",
     });
 
-    plugin.hooks?.beforeToolExecute?.(before.ctx as never);
+    await plugin.hooks?.beforeToolExecute?.(before.ctx as never);
 
     expect(before.denial).toBeUndefined();
     expect(before.env).toMatchObject({
@@ -3531,6 +3538,48 @@ Conversation: \`local:test:old-conversation\`
     );
   });
 
+  it("prefers linked GitHub noreply emails for the current actor", async () => {
+    process.env.GITHUB_APP_BOT_NAME = "sentry-junior[bot]";
+    process.env.GITHUB_APP_BOT_EMAIL = "bot@example.com";
+
+    const plugin = githubPlugin();
+    const before = beforeToolContext(
+      {
+        email: "david@example.com",
+        fullName: "David Cramer",
+        userId: "U039RR91S",
+        userName: "dcramer",
+      },
+      undefined,
+      async () => ({
+        identity: {
+          id: "slack-id",
+          provider: "slack",
+          providerSubjectId: "U039RR91S",
+        },
+        user: {
+          id: "user-1",
+          email: "david@example.com",
+          displayName: "David Cramer",
+          identities: [
+            {
+              id: "gh-id",
+              provider: "github",
+              providerSubjectId: "1473041",
+              handle: "dcramer",
+            },
+          ],
+        },
+      }),
+    );
+
+    await plugin.hooks?.beforeToolExecute?.(before.ctx as never);
+
+    expect(before.env.JUNIOR_GIT_ACTOR_COAUTHOR_TRAILERS).toBe(
+      "Co-Authored-By: David Cramer <1473041+dcramer@users.noreply.github.com>",
+    );
+  });
+
   it("records Junior as Git author and committer with human attribution", async () => {
     const {
       copyFileSync,
@@ -3553,7 +3602,7 @@ Conversation: \`local:test:old-conversation\`
       userId: "U039RR91S",
       userName: "dcramer",
     });
-    githubPlugin().hooks?.beforeToolExecute?.(before.ctx as never);
+    await githubPlugin().hooks?.beforeToolExecute?.(before.ctx as never);
 
     const hook = await prepareCommitMsgHookFixture("unused\n");
     const repoDir = mkdtempSync(join(tmpdir(), "junior-github-commit-"));
@@ -3603,7 +3652,7 @@ Conversation: \`local:test:old-conversation\`
     }
   });
 
-  it("credits the primary and additional run actors as co-author trailers", () => {
+  it("credits the primary and additional run actors as co-author trailers", async () => {
     process.env.GITHUB_APP_BOT_NAME = "sentry-junior[bot]";
     process.env.GITHUB_APP_BOT_EMAIL = "bot@example.com";
 
@@ -3637,7 +3686,7 @@ Conversation: \`local:test:old-conversation\`
     before.env.JUNIOR_GIT_ACTOR_COAUTHOR_TRAILERS =
       "Co-Authored-By: Model Supplied <model@example.com>";
 
-    plugin.hooks?.beforeToolExecute?.(before.ctx as never);
+    await plugin.hooks?.beforeToolExecute?.(before.ctx as never);
 
     expect(before.denial).toBeUndefined();
     expect(before.env.JUNIOR_GIT_ACTOR_COAUTHOR_TRAILERS).toBe(
@@ -3645,7 +3694,7 @@ Conversation: \`local:test:old-conversation\`
     );
   });
 
-  it("omits a steering actor without a resolvable name or email, without denying the commit", () => {
+  it("omits a steering actor without a resolvable name or email, without denying the commit", async () => {
     process.env.GITHUB_APP_BOT_NAME = "sentry-junior[bot]";
     process.env.GITHUB_APP_BOT_EMAIL = "bot@example.com";
 
@@ -3675,7 +3724,7 @@ Conversation: \`local:test:old-conversation\`
       },
     ]);
 
-    plugin.hooks?.beforeToolExecute?.(before.ctx as never);
+    await plugin.hooks?.beforeToolExecute?.(before.ctx as never);
 
     expect(before.denial).toBeUndefined();
     expect(before.env.JUNIOR_GIT_ACTOR_COAUTHOR_TRAILERS).toBe(
@@ -3683,7 +3732,7 @@ Conversation: \`local:test:old-conversation\`
     );
   });
 
-  it("uses a later resolvable profile for a duplicate actor identity", () => {
+  it("uses a later resolvable profile for a duplicate actor identity", async () => {
     process.env.GITHUB_APP_BOT_NAME = "sentry-junior[bot]";
     process.env.GITHUB_APP_BOT_EMAIL = "bot@example.com";
 
@@ -3704,14 +3753,14 @@ Conversation: \`local:test:old-conversation\`
       },
     ]);
 
-    plugin.hooks?.beforeToolExecute?.(before.ctx as never);
+    await plugin.hooks?.beforeToolExecute?.(before.ctx as never);
 
     expect(before.env.JUNIOR_GIT_ACTOR_COAUTHOR_TRAILERS).toBe(
       "Co-Authored-By: David Cramer <dave@example.com>",
     );
   });
 
-  it("dedups additional actors by resolved email and drops one matching the bot email", () => {
+  it("dedups additional actors by resolved email and drops one matching the bot email", async () => {
     process.env.GITHUB_APP_BOT_NAME = "sentry-junior[bot]";
     process.env.GITHUB_APP_BOT_EMAIL = "bot@example.com";
 
@@ -3750,7 +3799,7 @@ Conversation: \`local:test:old-conversation\`
       },
     ]);
 
-    plugin.hooks?.beforeToolExecute?.(before.ctx as never);
+    await plugin.hooks?.beforeToolExecute?.(before.ctx as never);
 
     expect(before.denial).toBeUndefined();
     expect(before.env.JUNIOR_GIT_ACTOR_COAUTHOR_TRAILERS).toBe(
@@ -3758,7 +3807,7 @@ Conversation: \`local:test:old-conversation\`
     );
   });
 
-  it("credits the primary actor in a single-actor run", () => {
+  it("credits the primary actor in a single-actor run", async () => {
     process.env.GITHUB_APP_BOT_NAME = "sentry-junior[bot]";
     process.env.GITHUB_APP_BOT_EMAIL = "bot@example.com";
 
@@ -3774,7 +3823,7 @@ Conversation: \`local:test:old-conversation\`
     before.env.JUNIOR_GIT_ACTOR_COAUTHOR_TRAILERS =
       "Co-Authored-By: Model Supplied <model@example.com>";
 
-    plugin.hooks?.beforeToolExecute?.(before.ctx as never);
+    await plugin.hooks?.beforeToolExecute?.(before.ctx as never);
 
     expect(before.denial).toBeUndefined();
     expect(before.env.JUNIOR_GIT_ACTOR_COAUTHOR_TRAILERS).toBe(
@@ -3865,7 +3914,7 @@ Conversation: \`local:test:old-conversation\`
     rmSync(dir, { recursive: true, force: true });
   });
 
-  it("uses Junior author identity when the human actor is unresolved", () => {
+  it("uses Junior author identity when the human actor is unresolved", async () => {
     process.env.GITHUB_APP_BOT_NAME = "sentry-junior[bot]";
     process.env.GITHUB_APP_BOT_EMAIL = "bot@example.com";
 
@@ -3876,7 +3925,7 @@ Conversation: \`local:test:old-conversation\`
       userName: "U039RR91S",
     });
 
-    plugin.hooks?.beforeToolExecute?.(before.ctx as never);
+    await plugin.hooks?.beforeToolExecute?.(before.ctx as never);
 
     expect(before.denial).toBeUndefined();
     expect(before.env).toMatchObject({
diff --git a/packages/junior-plugin-api/src/tools.ts b/packages/junior-plugin-api/src/tools.ts
index 6e24d3fce6..cfee578806 100644
--- a/packages/junior-plugin-api/src/tools.ts
+++ b/packages/junior-plugin-api/src/tools.ts
@@ -170,6 +170,13 @@ export interface BeforeToolExecuteHookContext extends PluginContext {
     input: Record<string, unknown>;
     name: string;
   };
+  /**
+   * Resolve the current actor's stored identity and linked user.
+   * Same contract as tool registration; used for commit attribution.
+   */
+  users: {
+    resolveActor(): Promise<{ identity: Identity; user?: User } | undefined>;
+  };
 }
 
 /**
diff --git a/packages/junior/src/chat/plugins/agent-hooks.ts b/packages/junior/src/chat/plugins/agent-hooks.ts
index a3a033998c..d89db75837 100644
--- a/packages/junior/src/chat/plugins/agent-hooks.ts
+++ b/packages/junior/src/chat/plugins/agent-hooks.ts
@@ -43,7 +43,10 @@ import { createResourceEventSubscription } from "@/chat/resource-events/store";
 import { RESOURCE_SUBSCRIPTION_DEFAULT_TTL_MS } from "@/chat/resource-events/tool-support";
 
 import { getSlackToolContext } from "@/chat/slack/tool-support/context";
-import { resolveViewerUser } from "@/chat/plugins/viewer";
+import {
+  readActorIdentity,
+  resolveViewerUser,
+} from "@/chat/plugins/viewer";
 import type { ToolRuntimeContext } from "@/chat/tools/types";
 import type {
   SandboxCommandInput,
@@ -1622,6 +1625,10 @@ export function createPluginHookRunner(
             name: tool.name,
             input: nextInput,
           },
+          users: {
+            resolveActor: async () =>
+              input.actor ? await readActorIdentity(input.actor) : undefined,
+          },
           env: {
             get(key) {
               return env[key] ?? normalizeEnv(nextInput.env)[key];