diff --git a/.github/workflows/review.yml b/.github/workflows/review.yml
index 1bf34de..260f886 100644
--- a/.github/workflows/review.yml
+++ b/.github/workflows/review.yml
@@ -62,7 +62,7 @@ on:
         description: "Gatehouse release image tag. Bump per release."
         type: string
         required: false
-        default: "quay.io/crunchtools/gatehouse:0.2.0"
+        default: "quay.io/crunchtools/gatehouse:0.3.0"
     secrets:
       GEMINI_API_KEY:
         required: true
diff --git a/README.md b/README.md
index 282cf8a..486f005 100644
--- a/README.md
+++ b/README.md
@@ -45,6 +45,16 @@ gatehouse --advisory
 
 All 8 agents run concurrently. Findings below 80% confidence are filtered out.
 
+## How Agents See Changes
+
+Since v0.3.0, agents do not receive raw unified diffs. Each hunk is rendered
+as a structured view: a BEFORE block (the old code, removed lines marked
+`[-]`) and an AFTER block (the new code with real file line numbers, added
+lines marked `[+]`), plus instructions to judge the direction of a change.
+Protections *added* by a change are treated as fixes, not findings;
+protections *removed* by a change are flagged. Diffs that cannot be parsed
+fall back to the raw unified format.
+
 ## Exit Codes
 
 | Code | Meaning |