Added a Try It section to README.

Author: dblock

README.md

@@ -64,6 +64,42 @@ steps:
   - Summarize the changes made to {{File.basename(file)}}.
 ```
 
+## Try it
+
+If you don’t have one already, get an OpenAI key from [here](https://platform.openai.com/settings/organization/api-keys). You will need an account with a credit card, make sure that a basic completion works.
+
+```bash
+export OPENAI_API_KEY=sk-proj-....
+
+curl -H "Content-Type: application/json" \
+    -H "Authorization: Bearer $API_TOKEN" \
+    -d '{"model":"gpt-4.1-mini","messages":[{"role":"user","content":"What is 1+1?"}]}' \
+    https://api.openai.com/v1/chat/completions
+```
+
+The [test grading workflow](examples/grading/workflow.md) in this repository is a senior software engineer and testing expert that evaluates the quality of a test based on guidelines.
+
+Try the workflow.
+
+```bash
+./exe/roast execute examples/grading/workflow.yml test/roast/resources_test.rb
+
+🔥🔥🔥 Everyone loves a good roast 🔥🔥🔥
+...
+```
+
+This will output a test grade.
+
+```
+========== TEST GRADE REPORT ==========
+Test file: test/roast/resources_test.rb
+
+FINAL GRADE:
+  Score: 80/100
+  Letter Grade: B
+```
+Note that you may also need `shadowenv` and `rg`, on MacOS run `brew install shadowenv` and `brew install rg`.
+
 ## How to use Roast
 
 1. Create a workflow YAML file defining your steps and tools

examples/grading/workflow.yml

@@ -1,5 +1,7 @@
 name: Test Grading
-model: anthropic:claude-opus-4
+api_token: $(echo $OPENAI_API_KEY)
+# model: anthropic:claude-opus-4
+model: gpt-4.1-mini
 
 tools:
   - Roast::Tools::Grep
@@ -23,16 +25,16 @@ steps:
 
 # set non-default attributes for steps below
 analyze_coverage:
-  model: gpt-4.1-mini
+#  model: gpt-4.1-mini
   auto_loop: false
   json: true
 
 generate_grades:
-  model: o3
+#  model: o3
   json: true
 
 generate_recommendations:
-  model: o3
+#  model: o3
   auto_loop: false
   json: true
   params: