diff --git a/.changeset/fix-type-assertions.md b/.changeset/fix-type-assertions.md
new file mode 100644
index 00000000..382d117e
--- /dev/null
+++ b/.changeset/fix-type-assertions.md
@@ -0,0 +1,9 @@
+---
+"@perstack/api-client": patch
+"@perstack/anthropic-provider": patch
+"@perstack/provider-core": patch
+"@perstack/react": patch
+---
+
+Fixed prohibited 'as' type assertions by replacing them with proper type guards
+
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 2a29cf7a..3009d093 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -14,13 +14,13 @@ permissions:
   contents: read
 
 env:
-  CI: 'true'
-  PNPM_VERSION: '10.10.0'
-  NODE_VERSION: '22'
+  CI: "true"
+  PNPM_VERSION: "10.10.0"
+  NODE_VERSION: "22"
 
 jobs:
-  quality:
-    name: Lint / Format / Knip
+  lint:
+    name: Lint / Format
     runs-on: ubuntu-24.04
     if: github.event_name == 'push' || github.event.pull_request.draft == false
     steps:
@@ -35,7 +35,7 @@ jobs:
         uses: actions/setup-node@v4
         with:
           node-version: ${{ env.NODE_VERSION }}
-          cache: 'pnpm'
+          cache: "pnpm"
 
       - name: Install dependencies
         run: pnpm install --frozen-lockfile
@@ -43,22 +43,125 @@ jobs:
       - name: Lint & Format check
         run: pnpm run format-and-lint
 
+  typecheck:
+    name: Type Check
+    runs-on: ubuntu-24.04
+    if: github.event_name == 'push' || github.event.pull_request.draft == false
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup pnpm
+        uses: pnpm/action-setup@v4
+        with:
+          version: ${{ env.PNPM_VERSION }}
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: ${{ env.NODE_VERSION }}
+          cache: "pnpm"
+
+      - name: Install dependencies
+        run: pnpm install --frozen-lockfile
+
       - name: Type check
         run: pnpm run typecheck
 
+  check-deps:
+    name: Check Dependencies
+    runs-on: ubuntu-24.04
+    if: github.event_name == 'push' || github.event.pull_request.draft == false
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup pnpm
+        uses: pnpm/action-setup@v4
+        with:
+          version: ${{ env.PNPM_VERSION }}
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: ${{ env.NODE_VERSION }}
+          cache: "pnpm"
+
+      - name: Install dependencies
+        run: pnpm install --frozen-lockfile
+
       - name: Check unused dependencies
         run: pnpm run check-deps
 
+  validate-versions:
+    name: Validate Versions
+    runs-on: ubuntu-24.04
+    if: github.event_name == 'push' || github.event.pull_request.draft == false
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup pnpm
+        uses: pnpm/action-setup@v4
+        with:
+          version: ${{ env.PNPM_VERSION }}
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: ${{ env.NODE_VERSION }}
+          cache: "pnpm"
+
+      - name: Install dependencies
+        run: pnpm install --frozen-lockfile
+
       - name: Validate version sync
         run: pnpm run validate:versions
 
+  validate-changeset:
+    name: Validate Changeset
+    runs-on: ubuntu-24.04
+    if: github.event_name == 'pull_request' && github.event.pull_request.draft == false
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup pnpm
+        uses: pnpm/action-setup@v4
+        with:
+          version: ${{ env.PNPM_VERSION }}
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: ${{ env.NODE_VERSION }}
+          cache: "pnpm"
+
+      - name: Install dependencies
+        run: pnpm install --frozen-lockfile
+
       - name: Validate changesets
         run: pnpm run validate:changeset
-        if: github.event_name == 'pull_request'
+
+  check-schema-diff:
+    name: Check Schema Diff
+    runs-on: ubuntu-24.04
+    if: github.event_name == 'pull_request' && github.event.pull_request.draft == false
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup pnpm
+        uses: pnpm/action-setup@v4
+        with:
+          version: ${{ env.PNPM_VERSION }}
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: ${{ env.NODE_VERSION }}
+          cache: "pnpm"
+
+      - name: Install dependencies
+        run: pnpm install --frozen-lockfile
 
       - name: Check schema diff
         run: pnpm run check:schema-diff
-        if: github.event_name == 'pull_request'
 
   test:
     name: Test
@@ -76,7 +179,7 @@ jobs:
         uses: actions/setup-node@v4
         with:
           node-version: ${{ env.NODE_VERSION }}
-          cache: 'pnpm'
+          cache: "pnpm"
 
       - name: Install dependencies
         run: pnpm install --frozen-lockfile
@@ -112,7 +215,7 @@ jobs:
         uses: actions/setup-node@v4
         with:
           node-version: ${{ env.NODE_VERSION }}
-          cache: 'pnpm'
+          cache: "pnpm"
 
       - name: Install dependencies
         run: pnpm install --frozen-lockfile
@@ -149,24 +252,10 @@ jobs:
         uses: actions/setup-node@v4
         with:
           node-version: ${{ env.NODE_VERSION }}
-          cache: 'pnpm'
+          cache: "pnpm"
 
       - name: Install dependencies
         run: pnpm install --frozen-lockfile
 
       - name: Check changeset
         run: pnpm changeset status --since=origin/main
-
-  ci-success:
-    name: CI Success
-    runs-on: ubuntu-24.04
-    needs: [quality, test, build]
-    if: always() && (github.event_name == 'push' || github.event.pull_request.draft == false)
-    steps:
-      - name: Check all job statuses
-        run: |
-          if [[ "${{ contains(needs.*.result, 'failure') }}" == "true" ]]; then
-            echo "::error::One or more CI jobs failed"
-            exit 1
-          fi
-          echo "✅ All CI checks passed!"
\ No newline at end of file
diff --git a/.github/workflows/issue-bot.yml b/.github/workflows/issue-bot.yml
deleted file mode 100644
index 4d7c8047..00000000
--- a/.github/workflows/issue-bot.yml
+++ /dev/null
@@ -1,50 +0,0 @@
-name: Issue Bot
-on:
-  issue_comment:
-    types: [created]
-  issues:
-    types: [opened]
-jobs:
-  respond:
-    if: |
-      (github.event_name == 'issues') ||
-      (github.event_name == 'issue_comment' && contains(github.event.comment.body, '@perstack-issue-bot'))
-    runs-on: ubuntu-latest
-    permissions:
-      issues: write
-      contents: read
-    steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-node@v4
-        with:
-          node-version: "22"
-      - name: Add reaction to indicate processing
-        env:
-          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-        run: |
-          if [ "${{ github.event_name }}" = "issue_comment" ]; then
-            gh api repos/${{ github.repository }}/issues/comments/${{ github.event.comment.id }}/reactions -f content=eyes
-          else
-            gh api repos/${{ github.repository }}/issues/${{ github.event.issue.number }}/reactions -f content=eyes
-          fi
-      - name: Post processing status
-        id: status_comment
-        env:
-          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-        run: |
-          COMMENT_URL=$(gh issue comment ${{ github.event.issue.number }} --body "🤖 Starting...")
-          COMMENT_ID=$(echo "$COMMENT_URL" | grep -oE '[0-9]+$')
-          echo "comment_id=$COMMENT_ID" >> $GITHUB_OUTPUT
-      - name: Run Issue Bot
-        env:
-          ANTHROPIC_API_KEY: ${{ secrets.ANTHROPIC_API_KEY }}
-          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-          GITHUB_REPO: ${{ github.repository }}
-          ISSUE_NUMBER: ${{ github.event.issue.number }}
-          COMMENT_ID: ${{ steps.status_comment.outputs.comment_id }}
-        run: |
-          echo 'model = "claude-sonnet-4-5"' > perstack.toml
-          echo '[provider]' >> perstack.toml
-          echo 'providerName = "anthropic"' >> perstack.toml
-          npm install -g tsx
-          npx perstack run @perstack/github-issue-bot "Answer issue #$ISSUE_NUMBER" 2>&1 | tsx scripts/checkpoint-filter.ts