diff --git a/extensions/telegram/src/channel-actions.ts b/extensions/telegram/src/channel-actions.ts
index 50f7826da70..26cf762fe77 100644
--- a/extensions/telegram/src/channel-actions.ts
+++ b/extensions/telegram/src/channel-actions.ts
@@ -71,6 +71,7 @@ function readTelegramMessageIdParam(
     required,
     integer: true,
     strict: true,
+    strictInteger: true,
   });
   if (required && typeof messageId !== "number") {
     throw new Error("messageId is required.");
diff --git a/src/agents/tools/common.params.test.ts b/src/agents/tools/common.params.test.ts
index 32eb63d036e..b8aef7b631e 100644
--- a/src/agents/tools/common.params.test.ts
+++ b/src/agents/tools/common.params.test.ts
@@ -63,6 +63,13 @@ describe("readNumberParam", () => {
     expect(readNumberParam(params, "messageId", { integer: true })).toBe(42);
   });
 
+  it("rejects fractional values when strictInteger is true", () => {
+    const params = { messageId: "42.9" };
+    expect(() =>
+      readNumberParam(params, "messageId", { integer: true, strictInteger: true }),
+    ).toThrow(/messageId must be an integer/);
+  });
+
   it("accepts snake_case aliases for camelCase keys", () => {
     const params = { message_id: "42" };
     expect(readNumberParam(params, "messageId")).toBe(42);
diff --git a/src/agents/tools/common.ts b/src/agents/tools/common.ts
index 81d3f4efc00..4a1146f34de 100644
--- a/src/agents/tools/common.ts
+++ b/src/agents/tools/common.ts
@@ -116,9 +116,16 @@ export function readStringOrNumberParam(
 export function readNumberParam(
   params: Record<string, unknown>,
   key: string,
-  options: { required?: boolean; label?: string; integer?: boolean; strict?: boolean } = {},
+  options: {
+    required?: boolean;
+    label?: string;
+    integer?: boolean;
+    strict?: boolean;
+    strictInteger?: boolean;
+  } = {},
 ): number | undefined {
-  const { required = false, label = key, integer = false, strict = false } = options;
+  const { required = false, label = key, integer = false, strict = false, strictInteger = false } =
+    options;
   const raw = readParamRaw(params, key);
   let value: number | undefined;
   if (typeof raw === "number" && Number.isFinite(raw)) {
@@ -138,7 +145,13 @@ export function readNumberParam(
     }
     return undefined;
   }
-  return integer ? Math.trunc(value) : value;
+  if (integer) {
+    if (strictInteger && !Number.isInteger(value)) {
+      throw new ToolInputError(`${label} must be an integer`);
+    }
+    return Math.trunc(value);
+  }
+  return value;
 }
 
 export function readStringArrayParam(
diff --git a/src/agents/tools/telegram-actions.ts b/src/agents/tools/telegram-actions.ts
index ec270ab32b0..3294ce1d917 100644
--- a/src/agents/tools/telegram-actions.ts
+++ b/src/agents/tools/telegram-actions.ts
@@ -136,6 +136,8 @@ export async function handleTelegramAction(
     });
     const messageId = readNumberParam(params, "messageId", {
       integer: true,
+      strict: true,
+      strictInteger: true,
     });
     if (typeof messageId !== "number" || !Number.isFinite(messageId) || messageId <= 0) {
       return jsonResult({
@@ -328,6 +330,7 @@ export async function handleTelegramAction(
       required: true,
       integer: true,
       strict: true,
+      strictInteger: true,
     });
     const token = resolveTelegramToken(cfg, { accountId }).token;
     if (!token) {
@@ -380,6 +383,8 @@ export async function handleTelegramAction(
     const messageId = readNumberParam(params, "messageId", {
       required: true,
       integer: true,
+      strict: true,
+      strictInteger: true,
     });
     const content = readStringParam(params, "content", {
       required: true,