Update claude setup and instructions

* Allow claude to use cargo
* Instruct it to format code before committing

Author: vlad-ivanov-name

.github/workflows/claude.yml

@@ -22,14 +22,20 @@ jobs:
       contents: read
       pull-requests: read
       issues: read
+      actions: read
       id-token: write
-      actions: read # Required for Claude to read CI results on PRs
     steps:
       - name: Checkout repository
         uses: actions/checkout@v5
         with:
           fetch-depth: 1
 
+      - name: Install Rust toolchain
+        uses: dtolnay/rust-toolchain@0f44b27771c32bda9f458f75a1e241b09791b331
+        with:
+          toolchain: "1.89.0"
+          components: rustfmt
+
       - name: Run Claude Code
         id: claude
         uses: anthropics/claude-code-action@v1
@@ -39,12 +45,11 @@ jobs:
           # This is an optional setting that allows Claude to read CI results on PRs
           additional_permissions: |
             actions: read
+            contents: write
+            pull-requests: write
 
           # Optional: Give a custom prompt to Claude. If this is not specified, Claude will perform the instructions specified in the comment that tagged it.
           # prompt: 'Update the pull request description to include a summary of changes.'
 
-          # Optional: Add claude_args to customize behavior and configuration
-          # See https://github.com/anthropics/claude-code-action/blob/main/docs/usage.md
-          # or https://docs.claude.com/en/docs/claude-code/cli-reference for available options
-          # claude_args: '--allowed-tools Bash(gh pr:*)'
-
+          # Allow Claude to create PRs and run cargo and git commands
+          claude_args: '--allowed-tools Bash(gh pr:*) Bash(cargo add:*) Bash(cargo fmt:*) Bash(cargo check:*) Bash(git:*)'

CLAUDE.md

@@ -0,0 +1,2 @@
+* Before creating commit, always run `cargo fmt`
+* When possible, keep PRs to one commit only; amend existing commit when making changes to PRs, and force push