diff --git a/actions/cairn-zig-fuzz-afl/action.yml b/actions/cairn-zig-fuzz-afl/action.yml
index 12385b0..7c9ae40 100644
--- a/actions/cairn-zig-fuzz-afl/action.yml
+++ b/actions/cairn-zig-fuzz-afl/action.yml
@@ -27,6 +27,15 @@ inputs:
     description: 'Binary name in zig-out/bin/ (auto-detected if only one)'
     required: false
     default: ''
+  seed_dir:
+    description: |
+      Directory containing per-target seed inputs. Each subdirectory should match
+      a target name from the targets input. Files are merged with the downloaded corpus.
+      Example layout:
+        seeds/lexer/valid-token.txt
+        seeds/parser/minimal-program.txt
+    required: false
+    default: ''
   duration:
     description: 'Fuzz duration per target in seconds'
     required: false
@@ -73,6 +82,7 @@ runs:
         COMMIT: ${{ inputs.commit }}
         TARGETS: ${{ inputs.targets }}
         FUZZ_BINARY: ${{ inputs.fuzz_binary }}
+        SEED_DIR: ${{ inputs.seed_dir }}
         DURATION: ${{ inputs.duration }}
         EXTRA_AFL_ARGS: ${{ inputs.afl_args }}
         TARGET_PLATFORM: ${{ inputs.target }}
@@ -130,6 +140,15 @@ runs:
           rm -rf "${SEEDS}"
           mkdir -p "${SEEDS}"
 
+          # Copy per-target seeds from repo if available.
+          if [ -n "${SEED_DIR}" ] && [ -d "${SEED_DIR}/${FUZZ_TARGET}" ]; then
+            REPO_SEED_COUNT=$(find "${SEED_DIR}/${FUZZ_TARGET}" -maxdepth 1 -type f | wc -l)
+            if [ "${REPO_SEED_COUNT}" -gt 0 ]; then
+              cp "${SEED_DIR}/${FUZZ_TARGET}"/* "${SEEDS}/" 2>/dev/null || true
+              echo "Copied ${REPO_SEED_COUNT} repo seeds from ${SEED_DIR}/${FUZZ_TARGET}"
+            fi
+          fi
+
           DL_START=$(date +%s)
           cairn corpus download \
             -server "${CAIRN_SERVER}" \
@@ -248,17 +267,32 @@ runs:
             done
           fi
 
-          # ── Upload new corpus entries ──
+          # ── Minimize and upload corpus ──
           QUEUE_DIR="${FINDINGS}/default/queue"
           if [ -d "${QUEUE_DIR}" ]; then
             QUEUE_COUNT=$(find "${QUEUE_DIR}" -maxdepth 1 -type f -name 'id:*' | wc -l)
             if [ "${QUEUE_COUNT}" -gt 0 ]; then
-              echo "Uploading corpus (${QUEUE_COUNT} entries)..."
+              UPLOAD_DIR="corpus-upload-${TARGET_NUM}"
+              rm -rf "${UPLOAD_DIR}"
+              mkdir -p "${UPLOAD_DIR}"
+              CMIN_START=$(date +%s)
+              if afl-cmin -i "${QUEUE_DIR}" -o "${UPLOAD_DIR}" -- "${FUZZ_BIN}" >/dev/null 2>&1; then
+                CMIN_ELAPSED=$(( $(date +%s) - CMIN_START ))
+                UPLOAD_COUNT=$(find "${UPLOAD_DIR}" -maxdepth 1 -type f | wc -l)
+                echo "Corpus for upload minimized: ${QUEUE_COUNT} -> ${UPLOAD_COUNT} entries (${CMIN_ELAPSED}s)"
+              else
+                echo "afl-cmin failed, uploading full queue"
+                rm -rf "${UPLOAD_DIR}"
+                UPLOAD_DIR="${QUEUE_DIR}"
+                UPLOAD_COUNT="${QUEUE_COUNT}"
+              fi
+              echo "Uploading corpus (${UPLOAD_COUNT} entries)..."
               cairn corpus upload \
                 -server "${CAIRN_SERVER}" \
                 -target-id "${CAIRN_TARGET_ID}" \
                 -run-id "${RUN_ID}" \
-                -dir "${QUEUE_DIR}"
+                -dir "${UPLOAD_DIR}"
+              rm -rf "corpus-upload-${TARGET_NUM}"
             fi
           fi