diff --git a/.env.example b/.env.example
index c1289b3..36dc54c 100644
--- a/.env.example
+++ b/.env.example
@@ -13,9 +13,6 @@ OPENAI_API_KEY=your_openai_key_here # https://platform.openai.com/api-keys
 ALPHAADVANTAGE_API_KEY=your_alphavantage_key_here  # https://www.alphavantage.co/support/#api-key
 JINA_API_KEY=your_jina_key_here # https://jina.ai/
 
-# System Configuration (Docker default paths)
-RUNTIME_ENV_PATH=/app/data/runtime_env.json
-
 # MCP Service Host Ports (exposed on host machine)
 # Container always uses 8000-8003 internally
 # Change these if you need different ports on your host
diff --git a/CHANGELOG.md b/CHANGELOG.md
index a851da9..c3019c0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,13 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Changed
+- **Simplified Configuration** - Removed `RUNTIME_ENV_PATH` environment variable
+  - No longer needed in docker-compose.yml or .env.example
+  - API mode dynamically manages runtime configs via `RuntimeConfigManager`
+  - Legacy tools gracefully handle missing `RUNTIME_ENV_PATH`
+  - Reduces configuration complexity for new deployments
+
 ## [0.3.0] - 2025-10-31
 
 ### Added - API Service Transformation
diff --git a/CLAUDE.md b/CLAUDE.md
index 4bc3946..f716659 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -20,7 +20,6 @@ cp .env.example .env
 # Edit .env and set:
 # - OPENAI_API_BASE, OPENAI_API_KEY
 # - ALPHAADVANTAGE_API_KEY, JINA_API_KEY
-# - RUNTIME_ENV_PATH (recommended: absolute path to runtime_env.json)
 # - MCP service ports (default: 8000-8003)
 # - AGENT_MAX_STEP (default: 30)
 ```
@@ -163,8 +162,10 @@ bash main.sh
 3. JSON config file
 4. Default values (lowest)
 
-**Runtime configuration** (`runtime_env.json` at `RUNTIME_ENV_PATH`):
-- Dynamic state: `TODAY_DATE`, `SIGNATURE`, `IF_TRADE`
+**Runtime configuration** (API mode only):
+- Dynamically created per model-day execution via `RuntimeConfigManager`
+- Isolated config files prevent concurrent execution conflicts
+- Contains: `TODAY_DATE`, `SIGNATURE`, `IF_TRADE`, `JOB_ID`
 - Written by `write_config_value()`, read by `get_config_value()`
 
 ### Agent System
@@ -319,9 +320,9 @@ When modifying agent behavior or adding tools:
 - Check Alpha Vantage API key is valid
 
 **Runtime Config Issues:**
-- Set `RUNTIME_ENV_PATH` to absolute path in `.env`
-- Ensure directory is writable
-- File gets created automatically on first run
+- Runtime configs are automatically managed by the API
+- Configs are created per model-day execution in `data/` directory
+- Ensure `data/` directory is writable
 
 **Agent Doesn't Stop Trading:**
 - Agent must output `<FINISH_SIGNAL>` within `max_steps`
diff --git a/README.md b/README.md
index 63aa99a..527f93e 100644
--- a/README.md
+++ b/README.md
@@ -291,9 +291,6 @@ OPENAI_API_KEY=your_openai_key
 ALPHAADVANTAGE_API_KEY=your_alpha_vantage_key
 JINA_API_KEY=your_jina_api_key
 
-# ⚙️ System Configuration
-RUNTIME_ENV_PATH=./runtime_env.json # Recommended to use absolute path
-
 # 🌐 Service Port Configuration
 MATH_HTTP_PORT=8000
 SEARCH_HTTP_PORT=8001
diff --git a/docker-compose.yml b/docker-compose.yml
index 7390b7d..f00e5d4 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -18,9 +18,6 @@ services:
       - ALPHAADVANTAGE_API_KEY=${ALPHAADVANTAGE_API_KEY}
       - JINA_API_KEY=${JINA_API_KEY}
 
-      # System Configuration
-      - RUNTIME_ENV_PATH=/app/data/runtime_env.json
-
       # MCP Service Ports (fixed internally)
       - MATH_HTTP_PORT=8000
       - SEARCH_HTTP_PORT=8001