diff --git a/.changeset/ast-pattern-analysis.md b/.changeset/ast-pattern-analysis.md
new file mode 100644
index 0000000..7be319a
--- /dev/null
+++ b/.changeset/ast-pattern-analysis.md
@@ -0,0 +1,10 @@
+---
+'@prosdevlab/dev-agent': patch
+---
+
+AST-based pattern analysis via tree-sitter queries
+
+- `dev_patterns` now uses tree-sitter AST queries for more accurate detection of error handling (try/catch, promise.catch, error classes), import style (dynamic imports, precise require), and type coverage (arrow function return types)
+- Bundles tree-sitter grammars for TypeScript, TSX, JavaScript — covers the full JS/TS ecosystem
+- Regex fallback preserved for unsupported file types (.go, .md, etc.)
+- 12 verified S-expression queries with 51 tests (exact match counts, negative cases, edge cases)
diff --git a/.claude/scratchpad.md b/.claude/scratchpad.md
index e0cc770..b00ea8f 100644
--- a/.claude/scratchpad.md
+++ b/.claude/scratchpad.md
@@ -17,6 +17,10 @@
 - Vue/Svelte SFC support — `.vue`/`.svelte` files have embedded `<script lang="ts">` blocks. Would need script block extraction before tree-sitter parsing. Lower priority — co-located `.ts` files in those projects already get full analysis.
 - Swap `WasmPatternMatcher` to `@ast-grep/napi` if bulk scanning perf becomes an issue (~4x faster native Rust). Interface is ready; implementation is mechanical.
 
+## Flaky Tests
+
+- **`packages/cli/src/commands/commands.test.ts:119` — "should display indexing summary without storage size"** times out at 30s on GitHub CI runners. The test indexes files and the slower CI runner can't finish in time. Needs either a higher timeout, a smaller test fixture, or mocking the indexer. Seen on PR #17 CI run.
+
 ## Test Gaps
 
 - **InspectAdapter integration test with PatternMatcher.** The InspectAdapter test constructs without a `patternMatcher` — the AST path is never exercised through the MCP layer. Needs a test that constructs `InspectAdapter` with `createPatternMatcher()`, mocks the search service, calls `execute()`, and verifies AST-enhanced results flow through. Requires mock search service setup — larger integration test scope.
diff --git a/website/content/latest-version.ts b/website/content/latest-version.ts
index 170ba67..578e841 100644
--- a/website/content/latest-version.ts
+++ b/website/content/latest-version.ts
@@ -4,10 +4,10 @@
  */
 
 export const latestVersion = {
-  version: '0.10.4',
-  title: 'MCP Tools Improvement (Phase 1)',
+  version: '0.10.5',
+  title: 'AST-Based Pattern Analysis',
   date: 'March 31, 2026',
   summary:
-    'dev_patterns is 10-30x faster, dev_health merged into dev_status, all tools return error recovery suggestions.',
-  link: '/updates#v0104--mcp-tools-improvement-phase-1',
+    'dev_patterns uses tree-sitter AST queries for more accurate detection of error handling, imports, and type coverage across .ts, .tsx, .js, .jsx files.',
+  link: '/updates#v0105--ast-based-pattern-analysis',
 } as const;
diff --git a/website/content/updates/index.mdx b/website/content/updates/index.mdx
index a5048a4..ada56d8 100644
--- a/website/content/updates/index.mdx
+++ b/website/content/updates/index.mdx
@@ -9,6 +9,21 @@ What's new in dev-agent. We ship improvements regularly to help AI assistants un
 
 ---
 
+## v0.10.5 — AST-Based Pattern Analysis
+
+*March 31, 2026*
+
+**`dev_patterns` now uses tree-sitter AST queries for more accurate code analysis.**
+
+- Detects try/catch, promise.catch, error classes, async/await in try — patterns regex couldn't see
+- Arrow function return types now detected accurately (regex was fragile on `(): Type => ...`)
+- Dynamic `import()` now counts as ESM, `require()` detection more precise
+- Bundles TypeScript, TSX, and JavaScript grammars — covers the full JS/TS ecosystem
+- 12 verified S-expression queries, 51 new tests with exact match counts
+- Regex fallback preserved for non-JS/TS files
+
+---
+
 ## v0.10.4 — MCP Tools Improvement (Phase 1)
 
 *March 31, 2026*