diff --git a/mateclaw-server/src/main/java/vip/mate/tool/builtin/CronJobTool.java b/mateclaw-server/src/main/java/vip/mate/tool/builtin/CronJobTool.java
index 2d8c90f5..dfd7acd0 100644
--- a/mateclaw-server/src/main/java/vip/mate/tool/builtin/CronJobTool.java
+++ b/mateclaw-server/src/main/java/vip/mate/tool/builtin/CronJobTool.java
@@ -217,17 +217,18 @@ public class CronJobTool {
     @Tool(description = "Enable or disable a scheduled task by its job ID. "
             + "Use list_cron_jobs first to find the job ID.")
     public String toggle_cron_job(
-            @ToolParam(description = "Job ID (number)") Long jobId,
+            @ToolParam(description = "Job ID. Must be passed as a string to preserve large integer precision") String jobId,
             @ToolParam(description = "true to enable, false to disable") Boolean enabled,
             @Nullable ToolContext ctx) {
         try {
+            Long parsedJobId = parseJobId(jobId);
             // RFC-083: scope toggle to the originating workspace.
             Long workspaceId = workspaceFromContext(ctx);
-            cronJobService.toggle(jobId, enabled, workspaceId);
-            CronJobDTO updated = cronJobService.getById(jobId, workspaceId);
+            cronJobService.toggle(parsedJobId, enabled, workspaceId);
+            CronJobDTO updated = cronJobService.getById(parsedJobId, workspaceId);
             Map<String, Object> result = new LinkedHashMap<>();
             result.put("success", true);
-            result.put("jobId", jobId);
+            result.put("jobId", parsedJobId);
             result.put("name", updated.getName());
             result.put("enabled", updated.getEnabled());
             result.put("nextRunTime", updated.getNextRunTime() != null ? updated.getNextRunTime().toString() : "");
@@ -242,14 +243,15 @@ public class CronJobTool {
     @Tool(description = "Delete a scheduled task by its job ID. This action requires user approval. "
             + "Use list_cron_jobs first to find the job ID.")
     public String delete_cron_job(
-            @ToolParam(description = "Job ID (number) to delete") Long jobId,
+            @ToolParam(description = "Job ID to delete. Must be passed as a string to preserve large integer precision") String jobId,
             @Nullable ToolContext ctx) {
         try {
+            Long parsedJobId = parseJobId(jobId);
             // RFC-083: scope delete to the originating workspace.
             Long workspaceId = workspaceFromContext(ctx);
-            CronJobDTO job = cronJobService.getById(jobId, workspaceId);
+            CronJobDTO job = cronJobService.getById(parsedJobId, workspaceId);
             String jobName = job.getName();
-            cronJobService.delete(jobId, workspaceId);
+            cronJobService.delete(parsedJobId, workspaceId);
             Map<String, Object> result = new LinkedHashMap<>();
             result.put("success", true);
             result.put("deleted", jobName);
@@ -267,6 +269,18 @@ public class CronJobTool {
         return writeJson(result);
     }
 
+    private Long parseJobId(String jobId) {
+        String trimmed = jobId != null ? jobId.trim() : "";
+        if (trimmed.isEmpty()) {
+            throw new IllegalArgumentException("jobId is required");
+        }
+        try {
+            return Long.parseLong(trimmed);
+        } catch (NumberFormatException e) {
+            throw new IllegalArgumentException("jobId must be a numeric string");
+        }
+    }
+
     /**
      * Serialize tool output through the id-safe application ObjectMapper so every
      * {@code Long} (notably {@code jobId}) is rendered as a string. Falls back to
diff --git a/mateclaw-server/src/test/java/vip/mate/tool/builtin/CronJobToolIdPrecisionTest.java b/mateclaw-server/src/test/java/vip/mate/tool/builtin/CronJobToolIdPrecisionTest.java
index 3c175c76..7739015f 100644
--- a/mateclaw-server/src/test/java/vip/mate/tool/builtin/CronJobToolIdPrecisionTest.java
+++ b/mateclaw-server/src/test/java/vip/mate/tool/builtin/CronJobToolIdPrecisionTest.java
@@ -1,11 +1,14 @@
 package vip.mate.tool.builtin;
 
+import com.fasterxml.jackson.databind.JsonNode;
 import com.fasterxml.jackson.databind.ObjectMapper;
 import com.fasterxml.jackson.databind.json.JsonMapper;
 import com.fasterxml.jackson.databind.module.SimpleModule;
 import com.fasterxml.jackson.databind.ser.std.ToStringSerializer;
 import org.junit.jupiter.api.DisplayName;
 import org.junit.jupiter.api.Test;
+import org.springframework.ai.support.ToolCallbacks;
+import org.springframework.ai.tool.ToolCallback;
 import vip.mate.cron.model.CronJobDTO;
 import vip.mate.cron.service.CronJobService;
 
@@ -52,4 +55,29 @@ class CronJobToolIdPrecisionTest {
         assertFalse(out.contains(": " + bigId) || out.contains(":" + bigId),
                 "jobId must NOT appear as a bare JSON number");
     }
+
+    @Test
+    @DisplayName("cron mutating tools publish jobId as a string parameter so LLM tool calls preserve precision")
+    void cronJobIdSchemasAreString() throws Exception {
+        CronJobTool tool = new CronJobTool(mock(CronJobService.class), idSafeMapper());
+
+        assertJobIdIsString(tool, "toggle_cron_job");
+        assertJobIdIsString(tool, "delete_cron_job");
+    }
+
+    private static void assertJobIdIsString(Object tool, String name) throws Exception {
+        JsonNode root = idSafeMapper().readTree(callback(tool, name).getToolDefinition().inputSchema());
+
+        assertTrue("string".equals(root.at("/properties/jobId/type").asText()),
+                name + " jobId must be a string schema");
+    }
+
+    private static ToolCallback callback(Object tool, String name) {
+        for (ToolCallback callback : ToolCallbacks.from(tool)) {
+            if (name.equals(callback.getToolDefinition().name())) {
+                return callback;
+            }
+        }
+        throw new AssertionError("Missing tool callback: " + name);
+    }
 }