diff --git a/CLAUDE.md b/CLAUDE.md
index f26ee87..f26a082 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -4,7 +4,7 @@ This file provides guidance to Claude Code (claude.ai/code) when working with co
 
 ## Project Overview
 
-TAKT (Task Agent Koordination Tool) is a multi-agent orchestration system for Claude Code. It enables YAML-based piece definitions that coordinate multiple AI agents through state machine transitions with rule-based routing.
+TAKT (TAKT Agent Koordination Topology) is a multi-agent orchestration system for Claude Code. It enables YAML-based piece definitions that coordinate multiple AI agents through state machine transitions with rule-based routing.
 
 ## Development Commands
 
diff --git a/README.md b/README.md
index 6cb8ddc..7faa1a3 100644
--- a/README.md
+++ b/README.md
@@ -2,7 +2,7 @@
 
 🇯🇵 [日本語ドキュメント](./docs/README.ja.md)
 
-**T**AKT **A**gent **K**oordination **T**ool - Define how AI agents coordinate, where humans intervene, and what gets recorded — in YAML
+**T**AKT **A**gent **K**oordination **T**opology - Define how AI agents coordinate, where humans intervene, and what gets recorded — in YAML
 
 TAKT runs multiple AI agents (Claude Code, Codex, OpenCode) through YAML-defined workflows. Each step — who runs, what they see, what's allowed, what happens on failure — is declared in a piece file, not left to the agent.
 
diff --git a/docs/README.ja.md b/docs/README.ja.md
index 9ab545c..a5186a5 100644
--- a/docs/README.ja.md
+++ b/docs/README.ja.md
@@ -1,6 +1,6 @@
 # TAKT
 
-**T**ask **A**gent **K**oordination **T**ool - AIエージェントの協調手順・人の介入ポイント・記録をYAMLで定義する
+**T**AKT **A**gent **K**oordination **T**opology - AIエージェントの協調手順・人の介入ポイント・記録をYAMLで定義する
 
 TAKTは複数のAIエージェント（Claude Code、Codex、OpenCode）をYAMLで定義されたワークフローに従って実行します。各ステップで誰が実行し、何を見て、何を許可し、失敗時にどうするかはピースファイルに宣言され、エージェント任せにしません。
 
diff --git a/package.json b/package.json
index 7b36cde..2491325 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "takt",
   "version": "0.12.0",
-  "description": "TAKT: Task Agent Koordination Tool - AI Agent Piece Orchestration",
+  "description": "TAKT: TAKT Agent Koordination Topology - AI Agent Piece Orchestration",
   "main": "dist/index.js",
   "types": "dist/index.d.ts",
   "bin": {
diff --git a/src/app/cli/program.ts b/src/app/cli/program.ts
index f605732..314c8c2 100644
--- a/src/app/cli/program.ts
+++ b/src/app/cli/program.ts
@@ -36,7 +36,7 @@ export const program = new Command();
 
 program
   .name('takt')
-  .description('TAKT: Task Agent Koordination Tool')
+  .description('TAKT: TAKT Agent Koordination Topology')
   .version(cliVersion);
 
 // --- Global options ---
diff --git a/src/index.ts b/src/index.ts
index 4731f7d..623af4d 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -1,5 +1,5 @@
 /**
- * TAKT - Task Agent Koordination Tool
+ * TAKT - TAKT Agent Koordination Topology
  *
  * This module exports the public API for programmatic usage.
  */