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README.md

@@ -1,3 +1,43 @@
----
-license: apache-2.0
----
+---
+license: apache-2.0
+---
+
+[Run `diff-apply` on
+Synthetic!](https://synthetic.new/hf/syntheticlab/diff-apply)
+
+`diff-apply` is a small, fast model to apply search-and-replace style diffs to
+code. Many coding agents use search-and-replace as the default first-line edit
+format; however, for larger diffs, it's common for even fairly good coding
+models to produce slightly inaccurate search strings, i.e. with spacing
+slightly off or with other minor differences.
+
+Typically, coding agents will do the following to handle those errors:
+
+1. Hardcode heuristics to attempt to apply certain classes of incorrect diffs
+2. If that fails, retry calling the original model, which can be expensive and
+   slow, and also can confuse the original model as to what the current file
+   state is.
+
+`diff-apply` is trained to fix those diffs, allowing coding agents to typically
+skip (expensive, slow, model-confusing) retries, much more robustly than
+hardcoded heuristics. It's a Llama 3.1 8b LoRA, which means you can run it
+cheaply on inference providers like
+[Synthetic](https://synthetic.new/hf/syntheticlab/diff-apply).
+
+The model expects prompts in the following format:
+
+```
+This edit is invalid; please fix it. The search string does not match perfectly with the file contents.
+Respond only with JSON, and only with the edit JSON, not the original file.
+If the edit is ambiguous, respond with null.
+{
+  "file": "the-underlying-file",
+  "edit": {
+    "type": "diff",
+    "search": "the-search-string",
+    "replace": "the-replace-string",
+  }
+}
+```
+
+It will respond with the fixed edit in JSON.