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+# Demo
+
+This is demo agent.
+
+## tools.{sh,js,py}
+
+You only need one of the `tools.sh`, `tools.js`, or `tools.py` files. All three are provided so that everyone can understand how to implement the tools in each language.
+
+## tools.txt
+
+The `tools.txt` is used to reuse the tools in the `tools/` directory.
+
+## index.yaml
+
+This document is essential as it defines the agent.
+
+### variables
+
+Variables are generally used to record a certain behavior or preference of a user.
+
+```yaml
+variables:
+  - name: foo
+    description: This is a foo
+  - name: bar
+    description: This is a bar with default value
+    default: val
+```
+
+Variables can be used in the `instructions`.
+
+```yaml
+instructions: |
+  The instructions can inline {{foo}} and {{bar}} variables.
+```
+
+### documents
+
+Documents are used for RAG.
+
+```yaml
+documents:
+  - https://raw.githubusercontent.com/sigoden/llm-functions/main/README.md
+```
+\ No newline at end of file