diff --git a/.gitignore b/.gitignore
index 40f86b9..9facfca 100644
--- a/.gitignore
+++ b/.gitignore
@@ -49,7 +49,10 @@ commands/
 # Local config files and secrets (keep demos/ checked in)
 config.txt
 config-*.txt
+!demos/baba-is-ai/config.txt
+!demos/color-sharing/config.txt
 !demos/provider-sensitivity/config-multi-provider.txt
+!demos/provider-sensitivity/config.txt
 !demos/social-deduction-game/config.txt
 *.env
 *.env.*
diff --git a/demos/baba-is-ai/README.md b/demos/baba-is-ai/README.md
index 6f43ff4..107da9c 100644
--- a/demos/baba-is-ai/README.md
+++ b/demos/baba-is-ai/README.md
@@ -73,7 +73,7 @@ Expected: Very rarely solved -- demonstrates the knowing-doing gap
 
 ## Swapping Providers
 
-Edit `config` to try different LLM providers:
+Edit `config.txt` to try different LLM providers:
 
 ```
 # OpenAI
@@ -97,7 +97,7 @@ api_key=YOUR_KEY_HERE
 | File | Purpose |
 |------|---------|
 | `baba-is-ai.nlogox` | Main NetLogo model with rule engine, levels, and LLM integration |
-| `config` | LLM provider configuration (defaults to local Ollama) |
+| `config.txt` | LLM provider configuration (defaults to local Ollama) |
 | `action-template.yaml` | Documents the prompt format (not used at runtime -- `llm:choose` builds its own prompt) |
 | `README.md` | This file |
 
diff --git a/demos/baba-is-ai/baba-is-ai.nlogox b/demos/baba-is-ai/baba-is-ai.nlogox
index f368501..26bf9b6 100644
--- a/demos/baba-is-ai/baba-is-ai.nlogox
+++ b/demos/baba-is-ai/baba-is-ai.nlogox
@@ -37,7 +37,7 @@ to setup
   set move-history []
 
   carefully [
-    llm:load-config "config"
+    llm:load-config "config.txt"
     set llm-config-loaded? true
   ] [
     output-print (word "Config error: " error-message)
@@ -732,7 +732,7 @@ A simplified recreation of "Baba Is You" where an LLM agent must solve puzzles b
 
 ### Extending
 
-- Edit `config` to try different LLM providers (OpenAI, Claude, Gemini)
+- Edit `config.txt` to try different LLM providers (OpenAI, Claude, Gemini)
 - Add new word types (DEFEAT, SINK) for more complex puzzles
 - Create levels where the agent must *construct* rules, not just break them
   </info>
diff --git a/demos/baba-is-ai/config b/demos/baba-is-ai/config.txt
similarity index 100%
rename from demos/baba-is-ai/config
rename to demos/baba-is-ai/config.txt
diff --git a/demos/color-sharing/color-sharing.nlogox b/demos/color-sharing/color-sharing.nlogox
index ccb2993..e72cbb2 100644
--- a/demos/color-sharing/color-sharing.nlogox
+++ b/demos/color-sharing/color-sharing.nlogox
@@ -20,7 +20,7 @@ to setup
   clear-all
 
   ; Load LLM configuration
-  llm:load-config "demos/config"
+  llm:load-config "config.txt"
 
   set-default-shape turtles "person"
 
diff --git a/demos/color-sharing/config.txt b/demos/color-sharing/config.txt
new file mode 100644
index 0000000..9701de3
--- /dev/null
+++ b/demos/color-sharing/config.txt
@@ -0,0 +1,28 @@
+# NetLogo Multi-LLM Extension - Color Sharing Demo Configuration
+# Configuration for the color sharing demo
+
+# =============================================================================
+# ACTIVE CONFIGURATION
+# =============================================================================
+
+# Choose your provider: openai, anthropic, gemini, ollama
+provider=ollama
+
+# Choose your model (must match the provider above)
+# OpenAI: gpt-4o-mini, gpt-4o, gpt-4-turbo, gpt-3.5-turbo
+# Anthropic: claude-3-haiku-20240307, claude-3-sonnet-20240229, claude-3-opus-20240229
+# Gemini: gemini-1.5-flash, gemini-1.5-pro, gemini-pro
+# Ollama: llama3.2, llama3.1, mistral, codellama (must be installed)
+model=llama3.2:3b
+
+# API Key (required for openai, anthropic, gemini - not needed for ollama)
+# IMPORTANT: Replace with your actual API key for cloud providers
+api_key=YOUR_API_KEY_HERE
+
+# Generation settings
+temperature=0.7
+max_tokens=200
+timeout_seconds=30
+
+# For Ollama (local)
+base_url=http://localhost:11434
\ No newline at end of file
diff --git a/demos/provider-sensitivity/config b/demos/provider-sensitivity/config.txt
similarity index 100%
rename from demos/provider-sensitivity/config
rename to demos/provider-sensitivity/config.txt
diff --git a/demos/provider-sensitivity/provider-sensitivity.nlogox b/demos/provider-sensitivity/provider-sensitivity.nlogox
index fd59aab..72a82a8 100644
--- a/demos/provider-sensitivity/provider-sensitivity.nlogox
+++ b/demos/provider-sensitivity/provider-sensitivity.nlogox
@@ -46,7 +46,7 @@ to setup
   ] [
     output-print (word ">> Config load failed: " error-message)
     carefully [
-      llm:load-config "config"
+      llm:load-config "config.txt"
       output-print ">> Loaded fallback config."
     ] [
       output-print (word ">> Fallback config load failed: " error-message)