diff --git a/.changelog/unreleased/106-anomaly-triage-write-permissions.md b/.changelog/unreleased/106-anomaly-triage-write-permissions.md
new file mode 100644
index 0000000..50a5f42
--- /dev/null
+++ b/.changelog/unreleased/106-anomaly-triage-write-permissions.md
@@ -0,0 +1,3 @@
+### Fixed
+
+- Declare the anomaly-triage caller's least-privilege write permissions so reusable jobs start and route entries in repositories whose default `GITHUB_TOKEN` is read-only.
diff --git a/docs/repo-update-log.md b/docs/repo-update-log.md
index fc31059..8befa84 100644
--- a/docs/repo-update-log.md
+++ b/docs/repo-update-log.md
@@ -15,6 +15,15 @@ This log records agent-visible repository changes that should be easy to audit l
 - **Propagation:** none | pending <repo/path> | completed <repo/path>
 ```
 
+## 2026-07-09 - Anomaly-triage caller write permissions
+
+- **Issue/PR:** #106 / #107
+- **Branch:** agent/codex/106-anomaly-triage-write-permissions
+- **Changed paths:** examples/anomaly-triage.yml, scripts/workflow-structure.test.mjs, .changelog/unreleased/106-anomaly-triage-write-permissions.md, docs/repo-update-log.md
+- **What changed:** The managed anomaly-triage caller now grants `contents: read`, `pull-requests: write`, and `issues: write`, which are the exact scopes its reusable workflow needs. Added a structural regression test because read-default consumers previously failed during reusable-workflow expansion before GitHub created any jobs.
+- **Verification:** TDD RED: `npm test -- scripts/workflow-structure.test.mjs` → 1 failed / 21 passed on the missing caller permission block. GREEN: the same command → 22 passed / 0 failed after adding the three scopes. `actionlint examples/anomaly-triage.yml` exited 0. Full `npm test` → 9 files / 180 tests / 180 passed. `git diff --check` exited 0 with working-tree LF-to-CRLF warnings only. Live consumer proof remains part of propagation.
+- **Propagation:** pending — refresh the `archon-setup` snapshot from the delivered provider source, update every opted-in ArchonVII consumer through normal updater lanes, and prove routing/idempotency in a read-default consumer PR.
+
 ## 2026-07-04 - Docs-gate lane (docs-system input) + fragment example cleanup
 
 - **Issue/PR:** #104 / (pending)
diff --git a/examples/anomaly-triage.yml b/examples/anomaly-triage.yml
index 30d97cc..52024ca 100644
--- a/examples/anomaly-triage.yml
+++ b/examples/anomaly-triage.yml
@@ -27,6 +27,11 @@ concurrency:
   group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
   cancel-in-progress: true
 
+permissions:
+  contents: read
+  pull-requests: write
+  issues: write
+
 jobs:
   triage:
     uses: ArchonVII/github-workflows/.github/workflows/anomaly-triage.yml@v1
diff --git a/scripts/workflow-structure.test.mjs b/scripts/workflow-structure.test.mjs
index 62b0fe6..2b1a8e3 100644
--- a/scripts/workflow-structure.test.mjs
+++ b/scripts/workflow-structure.test.mjs
@@ -229,6 +229,22 @@ describe('repo-required-gate caller example', () => {
   });
 });
 
+describe('anomaly-triage caller permission contract', () => {
+  it('grants the reusable workflow the least write permissions it requires', () => {
+    const body = readExample('anomaly-triage');
+
+    // Reusable workflows cannot elevate the caller token. Without this block,
+    // read-default consumers fail at workflow startup before jobs exist (#106).
+    const permissionsStart = body.indexOf('permissions:');
+    const jobsStart = body.indexOf('jobs:');
+    expect(permissionsStart).toBeGreaterThan(-1);
+    expect(permissionsStart).toBeLessThan(jobsStart);
+    expect(body.slice(permissionsStart, jobsStart).replaceAll('\r\n', '\n').trim()).toBe(
+      ['permissions:', '  contents: read', '  pull-requests: write', '  issues: write'].join('\n'),
+    );
+  });
+});
+
 describe('pr-policy workflow contract source', () => {
   it('uses the shared PR contract validator instead of inline body regexes', () => {
     const body = readWorkflow('pr-policy');