diff --git a/.gitignore b/.gitignore
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+++ b/.gitignore
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+.first-tree/tmp/
+.agents/skills/
+.claude/skills/
diff --git a/AGENTS.md b/AGENTS.md
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+<!-- BEGIN FIRST-TREE-SOURCE-INTEGRATION -->
+## First Tree integration
+
+> Managed block — regenerated by `first-tree` tooling. Do not edit by hand.
+
+This repo is a source/workspace repo. Keep all Context Tree files only in the dedicated `gstack-repo-tree` repo.
+
+### Binding
+
+- **Tree repo:** `gstack-repo-tree`
+- **GitHub tree repo:** `liuchao-001/gstack-repo-tree`
+- **Binding mode:** `standalone-source`
+- **Entrypoint:** `/`
+- **Tree repo URL:** <https://github.com/liuchao-001/gstack-repo-tree.git>
+
+<!--
+FIRST-TREE-BINDING-CONTRACT: managed-block-v1
+FIRST-TREE-SOURCE-INTEGRATION: source repo bound to dedicated tree repo `gstack-repo-tree`
+FIRST-TREE-TREE-REPO: `gstack-repo-tree`
+FIRST-TREE-TREE-REPO-SLUG: `liuchao-001/gstack-repo-tree`
+FIRST-TREE-TREE-MODE: `dedicated`
+FIRST-TREE-BINDING-MODE: `standalone-source`
+FIRST-TREE-TREE-REPO-URL: `https://github.com/liuchao-001/gstack-repo-tree.git`
+FIRST-TREE-ENTRYPOINT: `/`
+-->
+
+### Before every task
+
+- Treat this managed block as the canonical local binding contract for which Context Tree this repo belongs to.
+- Use the recorded tree repo name, tree repo URL, and GitHub slug from this block as the source of truth when deciding which tree to read or update.
+- If you already have that tree repo cloned locally, update it before you read anything else.
+- If you do not already have that tree repo cloned locally, clone a temporary working copy from `https://github.com/liuchao-001/gstack-repo-tree.git` into `.first-tree/tmp/gstack-repo-tree/`, use it for the current task, and delete it before you finish.
+- Never commit anything under `.first-tree/tmp/` to this repo. It is local-only workspace state.
+
+### After every task
+
+- Always ask whether the tree needs updating.
+- If the task changed decisions, constraints, rationale, ownership, or shared workspace relationships, open a PR in the tree repo first. Then open the source/workspace code PR.
+- If the task changed only implementation details, skip the tree PR and open only the source/workspace code PR.
+<!-- END FIRST-TREE-SOURCE-INTEGRATION -->
diff --git a/CLAUDE.md b/CLAUDE.md
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+++ b/CLAUDE.md
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+<!-- BEGIN FIRST-TREE-SOURCE-INTEGRATION -->
+## First Tree integration
+
+> Managed block — regenerated by `first-tree` tooling. Do not edit by hand.
+
+This repo is a source/workspace repo. Keep all Context Tree files only in the dedicated `gstack-repo-tree` repo.
+
+### Binding
+
+- **Tree repo:** `gstack-repo-tree`
+- **GitHub tree repo:** `liuchao-001/gstack-repo-tree`
+- **Binding mode:** `standalone-source`
+- **Entrypoint:** `/`
+- **Tree repo URL:** <https://github.com/liuchao-001/gstack-repo-tree.git>
+
+<!--
+FIRST-TREE-BINDING-CONTRACT: managed-block-v1
+FIRST-TREE-SOURCE-INTEGRATION: source repo bound to dedicated tree repo `gstack-repo-tree`
+FIRST-TREE-TREE-REPO: `gstack-repo-tree`
+FIRST-TREE-TREE-REPO-SLUG: `liuchao-001/gstack-repo-tree`
+FIRST-TREE-TREE-MODE: `dedicated`
+FIRST-TREE-BINDING-MODE: `standalone-source`
+FIRST-TREE-TREE-REPO-URL: `https://github.com/liuchao-001/gstack-repo-tree.git`
+FIRST-TREE-ENTRYPOINT: `/`
+-->
+
+### Before every task
+
+- Treat this managed block as the canonical local binding contract for which Context Tree this repo belongs to.
+- Use the recorded tree repo name, tree repo URL, and GitHub slug from this block as the source of truth when deciding which tree to read or update.
+- If you already have that tree repo cloned locally, update it before you read anything else.
+- If you do not already have that tree repo cloned locally, clone a temporary working copy from `https://github.com/liuchao-001/gstack-repo-tree.git` into `.first-tree/tmp/gstack-repo-tree/`, use it for the current task, and delete it before you finish.
+- Never commit anything under `.first-tree/tmp/` to this repo. It is local-only workspace state.
+
+### After every task
+
+- Always ask whether the tree needs updating.
+- If the task changed decisions, constraints, rationale, ownership, or shared workspace relationships, open a PR in the tree repo first. Then open the source/workspace code PR.
+- If the task changed only implementation details, skip the tree PR and open only the source/workspace code PR.
+<!-- END FIRST-TREE-SOURCE-INTEGRATION -->
diff --git a/WHITEPAPER.md b/WHITEPAPER.md
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--- /dev/null
+++ b/WHITEPAPER.md
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+.agents/skills/first-tree/SKILL.md
\ No newline at end of file