diff --git a/packages/diff-filter/src/patterns.ts b/packages/diff-filter/src/patterns.ts
index bbc23b7..e29a973 100644
--- a/packages/diff-filter/src/patterns.ts
+++ b/packages/diff-filter/src/patterns.ts
@@ -83,6 +83,14 @@ export const GENERATED_DIR_PREFIXES = [
   ".ruff_cache/",
   ".venv/",
   "venv/",
+  // Anchor framework (Solana). Sibling to Cargo's `target/` which is
+  // already covered above, but `.anchor/` holds the test-ledger
+  // genesis, IDL caches, and program-test snapshots that change on
+  // every `anchor build` / `anchor test` run. We use Anchor in this
+  // very repo at `contracts/solana/`, so PRs touching escrow
+  // instructions previously leaked these regen artifacts into the
+  // diff Sonnet scored.
+  ".anchor/",
 ];
 
 export const GENERATED_FILE_SUFFIXES = [
diff --git a/packages/diff-filter/tests/classify.test.ts b/packages/diff-filter/tests/classify.test.ts
index 34ce8b7..85f7393 100644
--- a/packages/diff-filter/tests/classify.test.ts
+++ b/packages/diff-filter/tests/classify.test.ts
@@ -49,6 +49,12 @@ describe("classifyPath — generated dirs", () => {
     "app/.next/static/chunks/webpack.js",
     "coverage/lcov-report/index.html",
     "__pycache__/module.cpython-311.pyc",
+    // Anchor framework — `.anchor/` holds regenerated ledger state and
+    // IDL caches. Both top-level and nested (under the actual workspace
+    // path used in this repo) must be filtered.
+    ".anchor/test-ledger/genesis.bin",
+    "contracts/solana/.anchor/test-ledger/rocksdb/CURRENT",
+    "contracts/solana/.anchor/program-logs/escrow.log",
   ])("marks %s as generated_dir", (path) => {
     const r = classifyPath(path);
     expect(r.ignore).toBe(true);