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diff --git a/tools/coin-flip/icon.png b/tools/coin-flip/icon.png
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diff --git a/tools/coin-flip/index.test.ts b/tools/coin-flip/index.test.ts
new file mode 100644
index 00000000..e02d52ed
--- /dev/null
+++ b/tools/coin-flip/index.test.ts
@@ -0,0 +1,54 @@
+import { expect } from '@jest/globals';
+import { getToolTestClient } from '../../src/test/utils';
+import * as path from 'path';
+
+describe('Coin Flip Tool', () => {
+  const toolPath = path.join(__dirname, 'tool.ts');
+  const client = getToolTestClient();
+
+  it('flips a coin with default parameters (3 sides)', async () => {
+    const response = await client.executeToolFromFile(toolPath, {});
+
+    expect(response).toHaveProperty('result');
+    expect(['-', '0', '+']).toContain(response.result);
+  });
+
+  it('flips a coin with custom sides', async () => {
+    const response = await client.executeToolFromFile(toolPath, {
+      sides: 2
+    });
+
+    expect(response).toHaveProperty('result');
+    expect(['heads', 'tails']).toContain(response.result);
+  });
+
+  it('flips a coin with custom side names', async () => {
+    const sideNames = ['past', 'present', 'future'];
+    const response = await client.executeToolFromFile(toolPath, {
+      sides: 3,
+      sideNames
+    });
+
+    expect(response).toHaveProperty('result');
+    expect(sideNames).toContain(response.result);
+  });
+
+  it('handles invalid side names length', async () => {
+    const response = await client.executeToolFromFile(toolPath, {
+      sides: 2,
+      sideNames: ['one', 'two', 'three']
+    });
+
+    expect(response).toHaveProperty('error');
+    expect(response.error).toContain('Number of side names');
+  });
+
+  it('handles negative sides', async () => {
+    const response = await client.executeToolFromFile(toolPath, {
+      sides: -1
+    });
+
+    expect(response).toHaveProperty('error');
+    expect(response.error).toContain('negative sides');
+  });
+});
diff --git a/tools/coin-flip/metadata.json b/tools/coin-flip/metadata.json
new file mode 100644
index 00000000..9bc149fa
--- /dev/null
+++ b/tools/coin-flip/metadata.json
@@ -0,0 +1,45 @@
+{
+  "id": "coin-flip",
+  "version": "1.0.0",
+  "name": "Coin Flip Tool",
+  "description": "Flip a coin with n sides using true randomness from random.org. Supports custom side names and various meta-usage patterns.",
+  "author": "Shinkai",
+  "keywords": ["random", "coin-flip", "decision-making", "shinkai"],
+  "tool_type": "typescript",
+  "configurations": {
+    "type": "object",
+    "properties": {},
+    "required": []
+  },
+  "parameters": {
+    "type": "object",
+    "properties": {
+      "sides": {
+        "type": "number",
+        "description": "Number of sides (default: 3)"
+      },
+      "sideNames": {
+        "type": "array",
+        "items": {
+          "type": "string"
+        },
+        "description": "Optional custom names for sides (must match number of sides)"
+      }
+    },
+    "required": []
+  },
+  "result": {
+    "type": "object",
+    "properties": {
+      "result": {
+        "type": "string",
+        "description": "The result of the coin flip"
+      },
+      "error": {
+        "type": "string",
+        "description": "Error message if the flip failed"
+      }
+    },
+    "required": ["result"]
+  }
+}
diff --git a/tools/coin-flip/store.json b/tools/coin-flip/store.json
new file mode 100644
index 00000000..c3ac9901
--- /dev/null
+++ b/tools/coin-flip/store.json
@@ -0,0 +1,3 @@
+{
+  "categoryId": "5f10d0b4-6acd-477a-96e1-be35634465b2"
+}
diff --git a/tools/coin-flip/tool.ts b/tools/coin-flip/tool.ts
new file mode 100644
index 00000000..e0b9f1f7
--- /dev/null
+++ b/tools/coin-flip/tool.ts
@@ -0,0 +1,79 @@
+import axios from 'npm:axios@1.7.7';
+
+type Configurations = Record<string, never>;
+
+type Parameters = {
+  sides?: number;
+  sideNames?: string[];
+};
+
+type Result = {
+  result: string;
+  error?: string;
+};
+
+export type Run<C extends Record<string, any>, I extends Record<string, any>, R extends Record<string, any>> = (
+  config: C,
+  inputs: I
+) => Promise<R>;
+
+export const run: Run<Configurations, Parameters, Result> = async (
+  _configurations: Configurations,
+  params: Parameters
+): Promise<Result> => {
+  try {
+    const sides = params.sides ?? 3;
+    const sideNames = params.sideNames;
+
+    if (sideNames && sideNames.length !== sides) {
+      return {
+        result: '',
+        error: `Number of side names (${sideNames.length}) must match number of sides (${sides})`
+      };
+    }
+
+    if (sides === 0) {
+      return { result: 'The coin vanished into another dimension! 🌀' };
+    }
+
+    if (sides === 1) {
+      return { result: '_' };
+    }
+
+    if (sides < 0) {
+      return { result: '', error: 'Cannot flip a coin with negative sides!' };
+    }
+
+    const response = await axios.get('https://www.random.org/integers/', {
+      params: {
+        num: 1,
+        min: 1,
+        max: sides,
+        col: 1,
+        base: 10,
+        format: 'plain',
+        rnd: 'new'
+      }
+    });
+
+    const result = parseInt(response.data);
+    let output: string;
+
+    if (sideNames) {
+      output = sideNames[result - 1].toLowerCase();
+    } else if (sides === 2) {
+      output = result === 1 ? 'heads' : 'tails';
+    } else if (sides === 3) {
+      output = result === 1 ? '-' : result === 2 ? '0' : '+';
+    } else {
+      output = `side ${result}`;
+    }
+
+    return { result: output };
+  } catch (error) {
+    return {
+      result: '',
+      error: `Error flipping coin: ${error instanceof Error ? error.message : 'Unknown error'}`
+    };
+  }
+};