diff --git a/.github/workflows/accuracy_performance.yml b/.github/workflows/accuracy_performance.yml
index b27089d..8323534 100644
--- a/.github/workflows/accuracy_performance.yml
+++ b/.github/workflows/accuracy_performance.yml
@@ -6,6 +6,7 @@ name: PR Evaluation
 
 on:
   pull_request:
+    types: [opened, synchronize, reopened, ready_for_review]
     branches:
       - main
     paths:
@@ -17,6 +18,10 @@ on:
       - 'benchmarks/**'
   workflow_dispatch:
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
 permissions:
   contents: read
   packages: write
@@ -28,6 +33,7 @@ jobs:
   # All downstream jobs pull these images instead of rebuilding.
   # ---------------------------------------------------------------------------
   build:
+    if: github.event_name != 'pull_request' || github.event.pull_request.draft == false
     name: Build CI images
     runs-on: ubuntu-latest
     outputs:
diff --git a/.github/workflows/correctness.yml b/.github/workflows/correctness.yml
index bf9f693..b79ef57 100644
--- a/.github/workflows/correctness.yml
+++ b/.github/workflows/correctness.yml
@@ -13,6 +13,7 @@ on:
       - 'asap-common/sketch-core/**'
       - '.github/workflows/correctness.yml'
   pull_request:
+    types: [opened, synchronize, reopened, ready_for_review]
     branches: [ main ]
     paths:
       - 'asap-common/tests/**'
@@ -21,9 +22,14 @@ on:
       - '.github/workflows/correctness.yml'
   workflow_dispatch:
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
 jobs:
   # ── 1. Cross-language token matching (Python vs Rust) ──────────────────────
   cross-language-token-matching:
+    if: github.event_name != 'pull_request' || github.event.pull_request.draft == false
     name: Cross-language PromQL token matching
     runs-on: ubuntu-latest
     steps:
@@ -82,6 +88,7 @@ jobs:
 
   # ── 2. Cross-language serialised pattern comparison ────────────────────────
   cross-language-pattern-serialisation:
+    if: github.event_name != 'pull_request' || github.event.pull_request.draft == false
     name: Cross-language pattern serialisation
     runs-on: ubuntu-latest
     steps:
@@ -136,6 +143,7 @@ jobs:
 
   # ── 3. Rust pattern-matching unit tests ────────────────────────────────────
   rust-pattern-matching:
+    if: github.event_name != 'pull_request' || github.event.pull_request.draft == false
     name: Rust pattern matching unit tests
     runs-on: ubuntu-latest
     steps:
diff --git a/.github/workflows/docker.yml b/.github/workflows/docker.yml
index c1376aa..d928369 100644
--- a/.github/workflows/docker.yml
+++ b/.github/workflows/docker.yml
@@ -5,6 +5,7 @@ on:
     tags:
       - 'v[0-9]+.[0-9]+.[0-9]+*'
   pull_request:
+    types: [opened, synchronize, reopened, ready_for_review]
     branches: [main]
     paths:
       - 'asap-common/installation/**'
@@ -21,12 +22,17 @@ on:
         required: true
         default: 'dev'
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
 permissions:
   packages: write
   contents: read
 
 jobs:
   build-images:
+    if: github.event_name != 'pull_request' || github.event.pull_request.draft == false
     runs-on: ubuntu-latest
     steps:
       - name: Checkout code
diff --git a/.github/workflows/python.yml b/.github/workflows/python.yml
index d0990ea..0590d12 100644
--- a/.github/workflows/python.yml
+++ b/.github/workflows/python.yml
@@ -12,6 +12,7 @@ on:
       - 'asap-common/dependencies/py/**'
       - '.github/workflows/python.yml'
   pull_request:
+    types: [opened, synchronize, reopened, ready_for_review]
     branches: [ main ]
     paths:
       - 'asap-summary-ingest/**'
@@ -23,12 +24,17 @@ on:
       - '.github/workflows/python.yml'
   workflow_dispatch:
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
 permissions:
   contents: read
   pull-requests: read
 
 jobs:
   detect-changes:
+    if: github.event_name != 'pull_request' || github.event.pull_request.draft == false
     runs-on: ubuntu-latest
     outputs:
       summary_ingest: ${{ steps.filter.outputs.summary_ingest }}
diff --git a/.github/workflows/rust.yml b/.github/workflows/rust.yml
index a7390d9..42bfdcf 100644
--- a/.github/workflows/rust.yml
+++ b/.github/workflows/rust.yml
@@ -12,6 +12,7 @@ on:
       - 'Cargo.lock'
       - '.github/workflows/rust.yml'
   pull_request:
+    types: [opened, synchronize, reopened, ready_for_review]
     branches: [ main ]
     paths:
       - 'asap-query-engine/**'
@@ -23,11 +24,16 @@ on:
       - '.github/workflows/rust.yml'
   workflow_dispatch:
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
 env:
   CARGO_TERM_COLOR: always
 
 jobs:
   format-and-lint:
+    if: github.event_name != 'pull_request' || github.event.pull_request.draft == false
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v4
@@ -64,6 +70,7 @@ jobs:
         RUSTC_WRAPPER: sccache
 
   test:
+    if: github.event_name != 'pull_request' || github.event.pull_request.draft == false
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v4
@@ -108,4 +115,4 @@ jobs:
       uses: docker/setup-buildx-action@v3
 
     - name: Build Docker image
-      run: docker build -f asap-query-engine/Dockerfile -t sketchdb-queryengine-rust:latest .
\ No newline at end of file
+      run: docker build -f asap-query-engine/Dockerfile -t sketchdb-queryengine-rust:latest .