diff --git a/changelog/2026-11-04-dynamic-ci-impacts-and-action-updates.mdx b/changelog/2026-11-04-dynamic-ci-impacts-and-action-updates.mdx
new file mode 100644
index 00000000..d5c366cb
--- /dev/null
+++ b/changelog/2026-11-04-dynamic-ci-impacts-and-action-updates.mdx
@@ -0,0 +1,19 @@
+---
+title: "Dynamic CI: Build tool impact signal and GitHub Action updates"
+description: "Send your build tool's impact to Dynamic CI from Buildkite, show verdicts on GitHub Actions run summaries, and set up the action with a lighter checkout."
+date: 2026-11-04
+category: Dynamic CI
+type: new-feature
+---
+
+**Dynamic CI can now use your build tool's view of a change, and the GitHub Action is easier to set up.** Dynamic CI is in private beta.
+
+### New features
+
+- **Send your build tool's impact from Buildkite.** If your build tool counts how much of the codebase a change affects, such as affected packages, send that count so Trunk runs broad changes. Requires the Buildkite plugin v0.1.8 or later. Ask us to turn the signal on. See the [Buildkite guide](/ci/dynamic-ci/getting-started/buildkite).
+
+### Updates
+
+- **Verdicts on the run summary.** Set `enable-annotation: true` on `trunk-io/dynamic-ci` to post each job's recommendation to the run's annotations and job summary. See the [action reference](/ci/dynamic-ci/dynamic-ci-action-reference).
+- **Lighter checkout.** The action only needs `actions/checkout` with `clean: false`. When the checkout lacks the base or head commit, it reads the changed files with `github-token`.
+- **Workflow checks.** Once your workflows call Dynamic CI, Trunk checks their YAML and flags problems. See the [GitHub Actions guide](/ci/dynamic-ci/getting-started/github-actions).
diff --git a/changelog/index.mdx b/changelog/index.mdx
index 26933a56..efe9e023 100644
--- a/changelog/index.mdx
+++ b/changelog/index.mdx
@@ -8,6 +8,12 @@ rss: true
 
 ### November 2026
 
+<Update label="November 4, 2026" tags={["Dynamic CI"]}>
+  **[Dynamic CI: Build tool impact signal and GitHub Action updates](/changelog/2026-11-04-dynamic-ci-impacts-and-action-updates)**
+
+  Send your build tool's impact to Dynamic CI from Buildkite, show verdicts on GitHub Actions run summaries, and set up the action with a lighter checkout.
+</Update>
+
 <Update label="November 3, 2026" tags={["Code Quality"]}>
   **[Code Quality: CLI 1.29.0](/changelog/2026-11-03-code-quality-cli-1-29-0)**
 
diff --git a/docs.json b/docs.json
index 49713738..bd096033 100644
--- a/docs.json
+++ b/docs.json
@@ -967,6 +967,7 @@
               {
                 "group": "November",
                 "pages": [
+                  "changelog/2026-11-04-dynamic-ci-impacts-and-action-updates",
                   "changelog/2026-11-03-code-quality-cli-1-29-0"
                 ]
               },