diff --git a/.github/workflows/agent-shield-reusable.yml b/.github/workflows/agent-shield-reusable.yml
index c9c84fdb1..49fd19236 100644
--- a/.github/workflows/agent-shield-reusable.yml
+++ b/.github/workflows/agent-shield-reusable.yml
@@ -32,6 +32,7 @@ on:
         type: string
         default: |
           CLAUDE.md
+          GEMINI.md
           AGENTS.md
       org-standards-ref:
         description: "String AGENTS.md must reference (regex, basic grep -E)"
@@ -49,6 +50,16 @@ jobs:
     steps:
       - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
 
+      # Fetch the org's agent-md-xref helper for cross-repository consumers.
+      # External consumers won't have scripts/lib/agent-md-xref.sh in their repo,
+      # so we fetch it from combsmith/.github with sparse-checkout.
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+        with:
+          repository: combsmith/.github
+          path: __org-github
+          sparse-checkout: scripts/lib/agent-md-xref.sh
+          sparse-checkout-cone-mode: false
+
       # --- Deep security scan via AgentShield CLI ---
       # Uses ecc-agentshield (https://github.com/affaan-m/agentshield)
       # 102 rules: secrets, permissions, hooks, MCP servers, agent config
@@ -121,17 +132,32 @@ jobs:
           done <<< "$REQUIRED_FILES"
           exit $status
 
+      # The AGENTS.md reference verdict lives in scripts/lib/agent-md-xref.sh
+      # (bats-tested; shared with the fleet compliance audit). Copy the file
+      # from either the caller's repo or the org-github checkout.
+      - name: Fetch cross-reference helper
+        run: |
+          mkdir -p "$RUNNER_TEMP/org-lib"
+          if [ -f "scripts/lib/agent-md-xref.sh" ]; then
+            cp "scripts/lib/agent-md-xref.sh" "$RUNNER_TEMP/org-lib/agent-md-xref.sh"
+          else
+            cp "__org-github/scripts/lib/agent-md-xref.sh" "$RUNNER_TEMP/org-lib/agent-md-xref.sh"
+          fi
+
       - name: Validate cross-references
         env:
           ORG_REF: ${{ inputs.org-standards-ref }}
         run: |
+          # shellcheck source=/dev/null
+          . "$RUNNER_TEMP/org-lib/agent-md-xref.sh"
           status=0
 
-          if [ -f "CLAUDE.md" ] && \
-             ! grep -qi 'AGENTS.md' CLAUDE.md; then
-            echo "::error file=CLAUDE.md::Must reference AGENTS.md"
-            status=1
-          fi
+          for f in CLAUDE.md GEMINI.md; do
+            if [ -f "$f" ] && ! agent_md_references_agents < "$f"; then
+              echo "::error file=$f::Must reference AGENTS.md"
+              status=1
+            fi
+          done
 
           if [ -f "AGENTS.md" ] && \
              ! grep -qiE "$ORG_REF" AGENTS.md; then
diff --git a/.github/workflows/compliance-audit-tests.yml b/.github/workflows/compliance-audit-tests.yml
index 57a30fde0..bf85da4d5 100644
--- a/.github/workflows/compliance-audit-tests.yml
+++ b/.github/workflows/compliance-audit-tests.yml
@@ -3,6 +3,7 @@
 #
 # Triggered on any PR that touches:
 #   - scripts/compliance-audit.sh
+#   - .github/workflows/agent-shield-reusable.yml (cross-reference helper wiring)
 #   - test/scripts/compliance-audit/**
 #   - .github/workflows/compliance-audit-and-improvement.yml
 #   - test/workflows/compliance-audit/**
@@ -22,6 +23,7 @@ on:
   pull_request:
     paths:
       - 'scripts/compliance-audit.sh'
+      - '.github/workflows/agent-shield-reusable.yml'
       - 'scripts/lib/**'
       - 'test/scripts/compliance-audit/**'
       - '.github/workflows/compliance-audit-and-improvement.yml'
@@ -33,6 +35,7 @@ on:
       - main
     paths:
       - 'scripts/compliance-audit.sh'
+      - '.github/workflows/agent-shield-reusable.yml'
       - 'scripts/lib/**'
       - 'test/scripts/compliance-audit/**'
       - '.github/workflows/compliance-audit-and-improvement.yml'
diff --git a/GEMINI.md b/GEMINI.md
new file mode 100644
index 000000000..823b695c8
--- /dev/null
+++ b/GEMINI.md
@@ -0,0 +1,5 @@
+# GEMINI.md
+
+This repository follows the development and agentic architecture standards defined in [AGENTS.md](AGENTS.md) and [`combsmith/.github/AGENTS.md`](https://github.com/combsmith/.github/blob/main/AGENTS.md).
+
+Read [AGENTS.md](AGENTS.md) for full context, project conventions, testing guidelines, and architectural rules.
diff --git a/scripts/compliance-audit.sh b/scripts/compliance-audit.sh
index d521e800a..f57fad3ab 100755
--- a/scripts/compliance-audit.sh
+++ b/scripts/compliance-audit.sh
@@ -281,6 +281,10 @@ RULESETS_SRC_DIR="${RULESETS_SRC_DIR:-$SCRIPT_DIR/../standards/rulesets}"
 # shellcheck source=lib/push-protection.sh
 . "$SCRIPT_DIR/lib/push-protection.sh"
 
+# Shared agent-file cross-reference verdict (also used by agent-shield-reusable.yml).
+# shellcheck source=lib/agent-md-xref.sh
+. "$SCRIPT_DIR/lib/agent-md-xref.sh"
+
 # Shared label source of truth — STANDARD_LABEL_SPECS (fixed set) and
 # persona_opt_out_label_configs (derived <id>:hands-off family). Sourced after
 # warn() is defined so the library uses this script's logging helper (issue #1139).
@@ -2556,26 +2560,96 @@ check_centralized_check_names() {
 check_claude_md() {
   local repo="$1"
 
-  local content
-  content=$(gh_api "repos/$ORG/$repo/contents/CLAUDE.md" --jq '.content' 2>/dev/null || echo "")
+  local content rc raw i
+  for i in 1 2 3; do
+    raw=$(gh api "repos/$ORG/$repo/contents/CLAUDE.md" 2>&1) && rc=0 || rc=$?
+    [ "$rc" -eq 0 ] && break
+    response_is_http_404 "$raw" && break
+    [ "$i" -lt 3 ] && sleep $((i * 2))
+  done
 
-  if [ -z "$content" ]; then
-    add_finding "$repo" "standards" "missing-claude-md" "error" \
-      "Missing \`CLAUDE.md\` — every repo must have a CLAUDE.md that references AGENTS.md" \
-      "AGENTS.md"
+  if [ "$rc" -ne 0 ]; then
+    if response_is_http_404 "$raw"; then
+      add_finding "$repo" "standards" "missing-claude-md" "error" \
+        "Missing \`CLAUDE.md\` — every repo must have a CLAUDE.md that references AGENTS.md" \
+        "AGENTS.md"
+    else
+      info "CLAUDE.md not readable for $repo (not a 404) — marking the repo inconclusive"
+      mark_repo_inconclusive "$repo"
+    fi
     return
   fi
 
-  local decoded
-  decoded=$(echo "$content" | base64 -d 2>/dev/null || echo "")
+  # An empty file is a successful API response with empty content: it is
+  # non-compliant (no AGENTS.md reference), not a reason to abort the audit.
+  # Undecodable content is inconclusive. Neither may fall through to a bare
+  # `return` carrying a failed test status, which would trip `set -e`.
+  content=$(printf '%s' "$raw" | jq -r '.content? // empty' 2>/dev/null || echo "")
 
-  if ! echo "$decoded" | grep -qi 'AGENTS\.md'; then
+  local decoded=""
+  if [ -n "$content" ]; then
+    if ! decoded=$(printf '%s' "$content" | base64 -d 2>/dev/null); then
+      info "CLAUDE.md content not decodable for $repo — marking the repo inconclusive"
+      mark_repo_inconclusive "$repo"
+      return 0
+    fi
+  fi
+
+  if ! printf '%s' "$decoded" | agent_md_references_agents; then
     add_finding "$repo" "standards" "claude-md-missing-agents-ref" "error" \
       "\`CLAUDE.md\` does not reference \`AGENTS.md\`" \
       "AGENTS.md"
   fi
 }
 
+# ---------------------------------------------------------------------------
+# Check: GEMINI.md exists and references AGENTS.md
+# ---------------------------------------------------------------------------
+check_gemini_md() {
+  local repo="$1"
+
+  local content rc raw i
+  for i in 1 2 3; do
+    raw=$(gh api "repos/$ORG/$repo/contents/GEMINI.md" 2>&1) && rc=0 || rc=$?
+    [ "$rc" -eq 0 ] && break
+    response_is_http_404 "$raw" && break
+    [ "$i" -lt 3 ] && sleep $((i * 2))
+  done
+
+  if [ "$rc" -ne 0 ]; then
+    if response_is_http_404 "$raw"; then
+      add_finding "$repo" "standards" "missing-gemini-md" "error" \
+        "Missing \`GEMINI.md\` — every repo must have a GEMINI.md that references AGENTS.md" \
+        "AGENTS.md"
+    else
+      info "GEMINI.md not readable for $repo (not a 404) — marking the repo inconclusive"
+      mark_repo_inconclusive "$repo"
+    fi
+    return
+  fi
+
+  # An empty file is a successful API response with empty content: it is
+  # non-compliant (no AGENTS.md reference), not a reason to abort the audit.
+  # Undecodable content is inconclusive. Neither may fall through to a bare
+  # `return` carrying a failed test status, which would trip `set -e`.
+  content=$(printf '%s' "$raw" | jq -r '.content? // empty' 2>/dev/null || echo "")
+
+  local decoded=""
+  if [ -n "$content" ]; then
+    if ! decoded=$(printf '%s' "$content" | base64 -d 2>/dev/null); then
+      info "GEMINI.md content not decodable for $repo — marking the repo inconclusive"
+      mark_repo_inconclusive "$repo"
+      return 0
+    fi
+  fi
+
+  if ! printf '%s' "$decoded" | agent_md_references_agents; then
+    add_finding "$repo" "standards" "gemini-md-missing-agents-ref" "error" \
+      "\`GEMINI.md\` does not reference \`AGENTS.md\`" \
+      "AGENTS.md"
+  fi
+}
+
 # ---------------------------------------------------------------------------
 # Check: AGENTS.md exists and references org .github/AGENTS.md
 # ---------------------------------------------------------------------------
@@ -3170,7 +3244,7 @@ create_umbrella_issue() {
     "reusable-workflows|Reusable Workflows (disabled_manually)|gh workflow disable <workflow> -R <repo>"
     "action-pinning|Action SHA Pinning|pin actions to SHA in each workflow file"
     "dependabot|Dependabot Configuration|per-repo .github/dependabot.yml"
-    "standards|Agent Standards (CLAUDE.md / AGENTS.md / copilot-setup-steps.yml)|per-repo doc and workflow additions"
+    "standards|Agent Standards (CLAUDE.md / GEMINI.md / AGENTS.md / copilot-setup-steps.yml)|per-repo doc and workflow additions"
   )
 
   local body
@@ -3774,6 +3848,7 @@ main() {
     check_verbatim_stubs "$repo"
     check_centralized_check_names "$repo"
     check_claude_md "$repo"
+    check_gemini_md "$repo"
     check_agents_md "$repo"
     check_copilot_setup_steps "$repo"
     check_copilot_instructions "$repo"
diff --git a/scripts/compliance-remediate.sh b/scripts/compliance-remediate.sh
index 6bfdbe025..546d894f5 100644
--- a/scripts/compliance-remediate.sh
+++ b/scripts/compliance-remediate.sh
@@ -913,6 +913,10 @@ remediate_finding() {
       report_skip "$repo" "$check" \
         "CLAUDE.md creation/update requires content knowledge — trigger Claude agent on the finding issue"
       ;;
+    standards/missing-gemini-md | standards/gemini-md-missing-agents-ref)
+      report_skip "$repo" "$check" \
+        "GEMINI.md creation/update requires content knowledge — trigger Claude agent on the finding issue"
+      ;;
     standards/missing-agents-md | standards/agents-md-missing-org-ref)
       report_skip "$repo" "$check" \
         "AGENTS.md creation/update requires content knowledge — trigger Claude agent on the finding issue"
diff --git a/scripts/lib/agent-md-xref.sh b/scripts/lib/agent-md-xref.sh
new file mode 100644
index 000000000..b2832505c
--- /dev/null
+++ b/scripts/lib/agent-md-xref.sh
@@ -0,0 +1,20 @@
+#!/usr/bin/env bash
+# agent-md-xref.sh — pure verdict for the agent-file cross-reference rule.
+#
+# Sourced by scripts/compliance-audit.sh (check_claude_md / check_gemini_md)
+# and fetched by .github/workflows/agent-shield-reusable.yml ("Validate
+# cross-references"), so the fleet audit and the per-repo CI gate share ONE
+# decision. Bats coverage: test/scripts/compliance-audit/agent-md-xref.bats.
+#
+#   agent_md_references_agents  — reads a file body on stdin; exit 0 when it
+#                                 contains the literal filename AGENTS.md
+#                                 (case-insensitive, fixed-string match, so
+#                                 "AGENTS-md" or "AGENTSxmd" never satisfy it).
+#                                 Empty input is non-compliant (exit 1).
+
+agent_md_references_agents() {
+  # Use here-string redirection to avoid SIGPIPE when grep matches early
+  # in large files. This allows the verdict logic to work correctly with
+  # pipefail enabled in compliance-audit.sh.
+  grep -Fi 'AGENTS.md' <<< "$(cat)" > /dev/null
+}
diff --git a/standards/agent-standards.md b/standards/agent-standards.md
index c9d465918..6635ad889 100644
--- a/standards/agent-standards.md
+++ b/standards/agent-standards.md
@@ -1,7 +1,7 @@
 # Agent Configuration Standards
 
 Standards for repositories that use AI agent configurations (CLAUDE.md,
-AGENTS.md, BMAD modules, Claude plugins, MCP server configs).
+GEMINI.md, AGENTS.md, BMAD modules, Claude plugins, MCP server configs).
 
 ---
 
@@ -12,6 +12,7 @@ Every repository MUST have:
 | File | Purpose | Compliance Check |
 |------|---------|-----------------|
 | `CLAUDE.md` | Project-level instructions for Claude Code | error if missing |
+| `GEMINI.md` | Project-level instructions for Gemini CLI / Antigravity | error if missing |
 | `AGENTS.md` | Development standards for AI agents | error if missing |
 
 ## Compliance Exemptions — Files Agents Must Not Modify
@@ -37,6 +38,13 @@ to all repos via the `@v1` tag bump.
 - MUST NOT contain overly permissive tool authorization (e.g., `dangerouslySkipPermissions`)
 - SHOULD define project-specific context (tech stack, conventions, key files)
 
+### GEMINI.md Requirements
+
+- MUST reference `AGENTS.md` for development standards
+- MUST NOT contain secrets, API keys, or credentials
+- MUST NOT contain overly permissive tool authorization
+- SHOULD reference the org-level standards (`combsmith/.github/AGENTS.md`) or project-specific context
+
 ### AGENTS.md Requirements
 
 - MUST reference the org-level standards: `combsmith/.github/AGENTS.md`
@@ -82,8 +90,9 @@ generic AgentShield scanner:
 
 | Rule | Severity | Description |
 |------|----------|-------------|
-| `required-files` | error | CLAUDE.md and AGENTS.md must exist |
+| `required-files` | error | CLAUDE.md, GEMINI.md, and AGENTS.md must exist |
 | `claude-reference` | error | CLAUDE.md must reference AGENTS.md |
+| `gemini-reference` | error | GEMINI.md must reference AGENTS.md |
 | `org-reference` | error | AGENTS.md must reference `combsmith/.github/AGENTS.md` |
 | `valid-frontmatter` | error | All SKILL.md files must have YAML frontmatter with `name` and `description` |
 
diff --git a/test/scripts/compliance-audit/agent-md-xref.bats b/test/scripts/compliance-audit/agent-md-xref.bats
new file mode 100644
index 000000000..ae59bcf5c
--- /dev/null
+++ b/test/scripts/compliance-audit/agent-md-xref.bats
@@ -0,0 +1,40 @@
+#!/usr/bin/env bats
+# Unit tests for scripts/lib/agent-md-xref.sh — the shared AGENTS.md
+# cross-reference verdict used by the fleet audit and agent-shield-reusable.yml.
+
+REPO_ROOT="$(cd "$BATS_TEST_DIRNAME/../../.." && pwd)"
+LIB="$REPO_ROOT/scripts/lib/agent-md-xref.sh"
+WORKFLOW="$REPO_ROOT/.github/workflows/agent-shield-reusable.yml"
+
+setup() { source "$LIB"; }
+
+@test "xref: body naming AGENTS.md passes" {
+  run agent_md_references_agents <<< "See [AGENTS.md](AGENTS.md)."
+  [ "$status" -eq 0 ]
+}
+
+@test "xref: match is case-insensitive" {
+  run agent_md_references_agents <<< "see agents.md"
+  [ "$status" -eq 0 ]
+}
+
+@test "xref: punctuation cannot stand in for the dot (fixed-string match)" {
+  run agent_md_references_agents <<< "AGENTSxmd AGENTS-md"
+  [ "$status" -ne 0 ]
+}
+
+@test "xref: empty body fails" {
+  run agent_md_references_agents < /dev/null
+  [ "$status" -ne 0 ]
+}
+
+@test "reusable workflow delegates the verdict to the helper for CLAUDE.md and GEMINI.md" {
+  grep -q 'agent_md_references_agents' "$WORKFLOW"
+  grep -q 'scripts/lib/agent-md-xref.sh' "$WORKFLOW"
+  ! grep -q "grep -qFi 'AGENTS.md'" "$WORKFLOW"
+}
+
+@test "agent_md_references_agents: early match on large piped input survives pipefail" {
+  run bash -c 'set -o pipefail; . "$0"; { echo "See AGENTS.md"; head -c 131072 /dev/zero | tr "\0" x; } | agent_md_references_agents' "$LIB"
+  [ "$status" -eq 0 ]
+}
diff --git a/test/scripts/compliance-audit/gemini-md.bats b/test/scripts/compliance-audit/gemini-md.bats
new file mode 100644
index 000000000..95ee56e71
--- /dev/null
+++ b/test/scripts/compliance-audit/gemini-md.bats
@@ -0,0 +1,83 @@
+#!/usr/bin/env bats
+# Unit tests for check_gemini_md in scripts/compliance-audit.sh
+# (standards/agent-standards.md).
+
+bats_require_minimum_version 1.5.0
+
+REPO_ROOT="$(cd "$BATS_TEST_DIRNAME/../../.." && pwd)"
+SCRIPT="$REPO_ROOT/scripts/compliance-audit.sh"
+
+setup() {
+  TMPDIR_TEST="$(mktemp -d)"
+  export TMPDIR_TEST
+}
+
+teardown() {
+  rm -rf "$TMPDIR_TEST"
+}
+
+# Stubs the `gh` CLI (the real entry point of check_gemini_md) so no network is
+# touched. GEMINI_MODE: "ok" returns a Contents API JSON body, "404" fails with
+# an HTTP 404, "500" fails with a non-404 error. The sleep between retries is
+# stubbed out so the non-404 path is fast.
+run_check_gemini_md() {
+  local repo="$1" gemini_body="$2" mode="${3:-ok}"
+  bash -c '
+    set -euo pipefail
+    export ORG="combsmith"
+    export OUTPUT_DIR="'"$TMPDIR_TEST"'"
+    source "'"$SCRIPT"'"
+    FINDINGS_FILE="$OUTPUT_DIR/findings.json"
+    INCONCLUSIVE_REPOS_FILE="$OUTPUT_DIR/inconclusive.txt"
+    echo "[]" > "$FINDINGS_FILE"
+    findings_count=0
+    GEMINI_BODY="$2"
+    GEMINI_MODE="$3"
+    sleep() { :; }
+    gh() {
+      case "$GEMINI_MODE" in
+        404) echo "gh: Not Found (HTTP 404)" >&2; return 1 ;;
+        500) echo "gh: Server Error (HTTP 500)" >&2; return 1 ;;
+      esac
+      printf "{\"content\":\"%s\"}" "$(printf "%s" "$GEMINI_BODY" | base64 | tr -d "\n")"
+    }
+    check_gemini_md "$1"
+    cat "$FINDINGS_FILE"
+    if [ -f "$INCONCLUSIVE_REPOS_FILE" ]; then echo "INCONCLUSIVE: $(cat "$INCONCLUSIVE_REPOS_FILE")"; fi
+  ' _ "$repo" "$gemini_body" "$mode"
+}
+
+@test "check_gemini_md: compliant GEMINI.md referencing AGENTS.md produces no finding" {
+  run run_check_gemini_md "incubator" "# GEMINI.md
+See [AGENTS.md](AGENTS.md) and https://github.com/combsmith/.github/blob/main/AGENTS.md"
+  [ "$status" -eq 0 ]
+  [ "$output" = "[]" ]
+}
+
+@test "check_gemini_md: missing GEMINI.md raises missing-gemini-md error" {
+  run run_check_gemini_md "incubator" "" 404
+  [ "$status" -eq 0 ]
+  [[ "$output" == *'"check": "missing-gemini-md"'* ]]
+  [[ "$output" == *'"severity": "error"'* ]]
+}
+
+@test "check_gemini_md: GEMINI.md without AGENTS.md reference raises gemini-md-missing-agents-ref error" {
+  run run_check_gemini_md "incubator" "# GEMINI.md
+Project instructions without referencing the required file."
+  [ "$status" -eq 0 ]
+  [[ "$output" == *'"check": "gemini-md-missing-agents-ref"'* ]]
+  [[ "$output" == *'"severity": "error"'* ]]
+}
+
+@test "check_gemini_md: empty GEMINI.md raises gemini-md-missing-agents-ref and does not abort" {
+  run run_check_gemini_md "incubator" ""
+  [ "$status" -eq 0 ]
+  [[ "$output" == *'"check": "gemini-md-missing-agents-ref"'* ]]
+}
+
+@test "check_gemini_md: non-404 API failure marks the repo inconclusive with no finding" {
+  run run_check_gemini_md "incubator" "" 500
+  [ "$status" -eq 0 ]
+  [[ "$output" == *"INCONCLUSIVE: incubator"* ]]
+  [[ "$output" != *"missing-gemini-md"* ]]
+}
diff --git a/test/scripts/compliance-remediate/routing-messages.bats b/test/scripts/compliance-remediate/routing-messages.bats
index f8aa1de37..6a86a5cf2 100644
--- a/test/scripts/compliance-remediate/routing-messages.bats
+++ b/test/scripts/compliance-remediate/routing-messages.bats
@@ -160,3 +160,27 @@ teardown() {
 
   ! grep -q 'review manually' "$report_dir/skipped.md"
 }
+
+# ---------------------------------------------------------------------------
+# standards/missing-gemini-md & standards/gemini-md-missing-agents-ref
+# ---------------------------------------------------------------------------
+
+@test "missing-gemini-md and gemini-md-missing-agents-ref route to the content-agent path" {
+  for check_name in missing-gemini-md gemini-md-missing-agents-ref; do
+    findings="$(tt_write_finding "broodminder-export" "standards" "$check_name")"
+    report_dir="${TT_TMP}/report-${check_name}"
+
+    GH_TOKEN=fake \
+      FINDINGS_FILE="$findings" \
+      REPORT_DIR="$report_dir" \
+      DRY_RUN=false \
+      run bash "$TT_SCRIPT"
+
+    [ "$status" -eq 0 ]
+
+    grep -q "$check_name" "$report_dir/skipped.md"
+    ! grep -q "$check_name" "$report_dir/remediation-report.md"
+    grep -q 'GEMINI.md creation/update requires content knowledge' "$report_dir/skipped.md"
+    ! grep -q 'review manually' "$report_dir/skipped.md"
+  done
+}