diff --git a/.github/actions/scorecard/action.yml b/.github/actions/scorecard/action.yml
index 204f1ec..b9383e4 100644
--- a/.github/actions/scorecard/action.yml
+++ b/.github/actions/scorecard/action.yml
@@ -1,11 +1,21 @@
 name: "OpenSSF Scorecard"
 description: |
-  Runs OpenSSF Scorecard checks, uploads SARIF to the GitHub Security tab, and publishes results to the OpenSSF database.
-  Required permissions on calling job: id-token: write, security-events: write, actions: read, contents: read
+  Runs OpenSSF Scorecard checks and uploads SARIF to the GitHub Security tab.
+  Required permissions on calling job: security-events: write, actions: read, contents: read
+
+  WARNING — publish_results: this input is a known footgun. The OpenSSF scorecard webapp
+  verifies that the calling workflow directly invokes ossf/scorecard-action as a job step.
+  Composite action wrapping hides that call. Setting publish_results: true will ALWAYS fail
+  with HTTP 400 "workflow has no job that calls ossf/scorecard-action". The default is false
+  and should remain false. To publish to the OpenSSF public database, call
+  ossf/scorecard-action directly in your workflow instead of using this composite action.
 inputs:
   publish_results:
-    description: "Publish results to the public OpenSSF Scorecard database and generate the Scorecard badge. Set to false for private repositories."
-    default: "true"
+    description: |
+      WARNING: always fails with HTTP 400 when set to true. The scorecard webapp cannot see
+      through composite action wrapping to verify the ossf/scorecard-action call. Keep false
+      (default). To actually publish, call ossf/scorecard-action directly in your workflow.
+    default: "false"
 runs:
   using: "composite"
   steps:
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 1ad4783..441671d 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -5,8 +5,6 @@ name: CI
 on:
   push:
     branches: [main]
-    paths:
-      - '.github/**'
   pull_request:
   schedule:
     - cron: '0 6 * * 1'  # weekly Monday 06:00 UTC — for scorecard
@@ -53,12 +51,11 @@ jobs:
   scorecard:
     name: OpenSSF Scorecard
     runs-on: ubuntu-latest
-    if: github.event_name != 'pull_request' && github.ref == 'refs/heads/main'
+    if: github.ref == 'refs/heads/main'
     permissions:
       contents: read
       actions: read
       security-events: write
-      id-token: write
     steps:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
         with:
diff --git a/README.md b/README.md
index 6c2d5b8..7ad77d3 100644
--- a/README.md
+++ b/README.md
@@ -23,7 +23,7 @@ gh api repos/sparkgeo/github-actions/commits/main --jq '.sha'
 |---|---|---|---|
 | GitHub Actionlint | [`github-actionlint`](.github/actions/github-actionlint/action.yml) | Lints workflow and action YAML files using actionlint via reviewdog; posts annotations as GitHub Checks | None |
 | Zizmor | [`zizmor`](.github/actions/zizmor/action.yml) | Runs zizmor static security analysis against workflow and action YAML files; uploads findings as SARIF to the Security tab | None |
-| OpenSSF Scorecard | [`scorecard`](.github/actions/scorecard/action.yml) | Runs OpenSSF Scorecard checks; uploads SARIF to the Security tab and publishes results to the OpenSSF database | `publish_results` (default: `true` — set to `false` for private repos) |
+| OpenSSF Scorecard | [`scorecard`](.github/actions/scorecard/action.yml) | Runs OpenSSF Scorecard checks; uploads SARIF to the Security tab | `publish_results` (default: `false` — always fails with HTTP 400 if set to `true`; see action description) |
 | Dependency Review | [`dependency-review`](.github/actions/dependency-review/action.yml) | Blocks PRs introducing dependencies with known vulnerabilities or denied licenses; posts a summary comment | `fail-on-severity` (default: `high`), `deny-licenses` (default: `GPL-2.0,GPL-3.0,AGPL-3.0`), `comment-summary-in-pr` (default: `on-failure`) |
 | Storage Optimizer | [`storage-optimizer`](.github/actions/storage-optimizer/action.yml) | Frees disk space on GitHub-hosted runners by removing unused toolchains (JDK, .NET, Swift, Android SDK, etc.) and pruning Docker | None |
 | Terramate + OpenTofu Setup | [`terramate-opentofu-setup`](.github/actions/terramate-opentofu-setup/action.yml) | Installs Terramate and OpenTofu, validates generated files are up to date, initialises changed stacks, and lists changed stacks | `opentofu_version` (default: `1.10.0`), `terramate_version` (default: `0.14.7`) |
@@ -62,7 +62,9 @@ jobs:
 
 ### OpenSSF Scorecard
 
-Requires `id-token: write` for OIDC signing. Only runs on public repos with `publish_results: true`.
+SARIF is always uploaded to the GitHub Security tab. Does not require `id-token: write` — `publish_results` defaults to `false` and no OIDC token is consumed.
+
+> **Note on `publish_results`:** Setting `publish_results: true` always fails with HTTP 400. The scorecard webapp verifies that the calling workflow directly invokes `ossf/scorecard-action` as a job step — composite action wrapping hides that call. Keep the default (`false`). To publish to the public OpenSSF database, call `ossf/scorecard-action` directly in your workflow.
 
 ```yaml
 jobs:
@@ -72,12 +74,12 @@ jobs:
       contents: read
       actions: read
       security-events: write
-      id-token: write
     steps:
       - uses: actions/checkout@<SHA>
         with:
           persist-credentials: false
       - uses: sparkgeo/github-actions/.github/actions/scorecard@<SHA>
+        # publish_results defaults to false — do not set to true (always fails with HTTP 400)
 ```
 
 ### Dependency Review
diff --git a/SECURITY.md b/SECURITY.md
new file mode 100644
index 0000000..a24ebbd
--- /dev/null
+++ b/SECURITY.md
@@ -0,0 +1,45 @@
+# Security Policy
+
+## Reporting a Vulnerability
+
+**Do not open a public GitHub issue for security vulnerabilities.**
+
+Report vulnerabilities via the [GitHub Security Advisory](../../security/advisories/new) process:
+
+1. Go to the **Security** tab of this repository.
+2. Click **Report a vulnerability**.
+3. Fill in the advisory form with a description, affected versions, and reproduction steps.
+
+Alternatively, email **info@sparkgeo.com** with the subject line `[SECURITY] sparkgeo/github-actions`.
+
+## Disclosure Timeline
+
+| Phase | Target |
+|---|---|
+| Acknowledgement | Within 2 business days of receipt |
+| Initial assessment | Within 5 business days |
+| Fix or mitigation | Within 30 days for high/critical; 90 days for moderate/low |
+| Public disclosure | After fix is released, or 90 days from report (whichever comes first) |
+
+We follow coordinated vulnerability disclosure. If we cannot ship a fix within 90 days, we will notify the reporter and agree on an extended timeline before any public disclosure.
+
+## Scope
+
+This repository contains reusable GitHub Actions composite actions. Vulnerabilities in scope include:
+
+- Supply chain risks in pinned action SHAs or version references
+- Script injection via user-controlled context variables in workflow or action YAML
+- Overly permissive `GITHUB_TOKEN` permissions that could be exploited
+- Secrets or credentials inadvertently exposed in workflow logs or artifacts
+- Logic errors in composite actions that could cause callers to grant unintended access
+
+Out of scope: vulnerabilities in third-party actions referenced by this repo (report those upstream). We will update our pinned SHA if a referenced action releases a security patch.
+
+## Supported Versions
+
+This repo does not use versioned releases. All consumers should pin to a specific commit SHA and update via Dependabot or Renovate (see `docs/approved-actions.md`). Only the current `main` branch is actively maintained.
+
+## Security Contacts
+
+- GitHub Security Advisory (preferred): https://github.com/sparkgeo/github-actions/security/advisories/new
+- Email: info@sparkgeo.com