Add create-token-assets skill

.claude/skills/create-token-assets/SKILL.md

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+---
+name: create-token-assets
+description: create token icon assets and open a PR to the tokenAssets repo
+---
+
+## Activation Criteria
+Use this skill when:
+- Adding a new token icon to the tokenAssets repo
+- User says "/create-token-assets"
+
+## Prerequisites
+
+- **rsvg-convert** (from `librsvg2-bin` / `librsvg`) for SVG-to-PNG conversion
+- **GitHub MCP server** configured
+
+## Target Repository
+
+- **Owner:** yearn
+- **Repo:** tokenAssets
+- **Structure:** `tokens/{chainId}/{address}/logo.svg`, `logo-32.png`, `logo-128.png`
+
+## Supported Chains
+
+| Chain ID | Name |
+|----------|------|
+| 1 | Ethereum |
+| 10 | Optimism |
+| 100 | Gnosis Chain |
+| 137 | Polygon |
+| 146 | Sonic |
+| 250 | Fantom |
+| 8453 | Base |
+| 42161 | Arbitrum |
+| 80094 | Berachain |
+| 747474 | Katana |
+
+## Public RPCs (for ERC-20 name lookup)
+
+| Chain ID | RPC |
+|----------|-----|
+| 1 | https://eth.llamarpc.com |
+| 10 | https://mainnet.optimism.io |
+| 100 | https://rpc.gnosischain.com |
+| 137 | https://polygon-rpc.com |
+| 146 | https://rpc.soniclabs.com |
+| 250 | https://1rpc.io/ftm |
+| 8453 | https://mainnet.base.org |
+| 42161 | https://arb1.arbitrum.io/rpc |
+| 80094 | https://rpc.berachain.com |
+| 747474 | https://rpc.katana.network |
+
+## Workflow
+
+### 1. Check for rsvg-convert
+
+Run `which rsvg-convert`. If not found, use `AskUserQuestion` to ask:
+> rsvg-convert is not installed. It's needed to generate PNG files from SVG. Install it now?
+
+If yes, install:
+- **Debian/Ubuntu:** `sudo apt-get install -y librsvg2-bin`
+- **macOS:** `brew install librsvg`
+
+If no, stop and explain it's required.
+
+### 2. Gather inputs
+
+Use `AskUserQuestion` to collect:
+
+**Question 1 — Chain and address:**
+> Which chain and token address? (e.g. "1 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48")
+
+Parse the response into `chainId` and `address`. Validate:
+- `chainId` is a number from the supported chains table
+- `address` matches `0x[a-fA-F0-9]{40}`
+
+**Question 2 — SVG source:**
+> Where is the SVG icon? Provide a file path, URL, or a directory to search.
+
+Handle the three cases:
+- **Direct file path** (e.g. `~/icons/token.svg`) — use it directly
+- **URL** (starts with `http`) — download with `curl -sL`
+- **Directory / vague path** (e.g. `../governance-apps`) — use `Glob` with patterns like `**/*.svg`, `**/*logo*`, `**/*icon*` to find SVG candidates. If multiple matches, use `AskUserQuestion` to let the user pick.
+
+### 3. Fetch token name
+
+Fetch the ERC-20 `name()` using the public RPC for the chain:
+
+```bash
+curl -s -X POST <RPC_URL> \
+  -H "Content-Type: application/json" \
+  -d '{"jsonrpc":"2.0","method":"eth_call","params":[{"to":"<ADDRESS>","data":"0x06fdde03"},"latest"],"id":1}'
+```
+
+The response `result` is ABI-encoded. Decode:
+1. Strip `0x` prefix
+2. Skip first 64 hex chars (offset pointer)
+3. Read next 64 hex chars as uint256 (string length in bytes)
+4. Read that many bytes (x2 hex chars) as UTF-8
+
+If the RPC call fails, use `AskUserQuestion` to ask the user for the token name.
+
+### 4. Verify no duplicate
+
+Check if `tokens/{chainId}/{address_lowercase}/` already exists in this repo.
+If it does, warn the user and ask whether to overwrite or abort.
+
+### 5. Generate assets
+
+Lowercase the address. Create the target directory:
+```bash
+mkdir -p tokens/{chainId}/{address}/
+```
+
+Copy (or download) the SVG into place:
+```bash
+cp <source.svg> tokens/{chainId}/{address}/logo.svg
+```
+
+Generate PNGs:
+```bash
+rsvg-convert -w 32 -h 32 tokens/{chainId}/{address}/logo.svg -o tokens/{chainId}/{address}/logo-32.png
+rsvg-convert -w 128 -h 128 tokens/{chainId}/{address}/logo.svg -o tokens/{chainId}/{address}/logo-128.png
+```
+
+### 6. Create branch, commit, push, open PR
+
+Ensure you're on a clean state off `main`:
+```bash
+git checkout main
+git pull
+```
+
+Create a branch using the token name (sanitized to kebab-case, lowercase, alphanumeric + hyphens):
+```bash
+git checkout -b add-<token-name-kebab>-<chainId>
+```
+
+Stage and commit:
+```bash
+git add tokens/{chainId}/{address}/
+git commit -m "Add <token name> icon on chain <chainId>"
+```
+
+Push and create PR using GitHub MCP tools:
+- Push the branch with `git push -u origin <branch>`
+- Use `mcp github create_pull_request` with:
+  - **title:** `Add <token name> icon on chain <chainId>`
+  - **body:** summary with chain ID, address, and file paths
+  - **base:** `main`
+  - **head:** the branch name
+
+Report the PR URL to the user.
+
+### 7. Clean up
+
+Switch back to main:
+```bash
+git checkout main
+```