JSPM

Plugin providing Claude Code–style hooks, specialized agents (doc-writer, code reviewer, architect, partner, etc.), dedicated commands such as simplify-code and review-pr, and tools such as gitingest.

Table of Contents

• Installation
• Commands
• Agents
• Tools
  • gitingest
  • diff-summary
  • prompt-session
  • list-child-sessions
  • Blockchain
    • eth-transaction
    • eth-address-balance
    • eth-address-txs
    • eth-token-transfers
• Hooks
  • Configuration Locations
  • Configuration File Format
  • Supported Events
  • Conditions
  • Supported Actions
  • Execution Behavior
  • Example Hook Configurations
• Configuration Options
• License

Installation

From npm (recommended)

Add the plugin to your OpenCode configuration file (opencode.json):

{
  "$schema": "https://opencode.ai/config.json",
  "plugin": ["opencode-froggy"]
}

From local files

Alternatively, clone or copy the plugin files to one of these directories:

• Project-local: .opencode/plugin/opencode-froggy/
• Global: ~/.config/opencode/plugin/opencode-froggy/

Commands

Agents

Tools

gitingest

Fetch a GitHub repository's full content via gitingest.com. Returns summary, directory tree, and file contents optimized for LLM analysis. Use when you need to understand an external repository's structure or code.

Parameters

Usage Examples

// Fetch entire repository
gitingest({ url: "https://github.com/user/repo" })

// Only TypeScript files
gitingest({ 
  url: "https://github.com/user/repo",
  pattern: "*.ts",
  patternType: "include"
})

// Exclude test files
gitingest({
  url: "https://github.com/user/repo", 
  pattern: "*.test.ts",
  patternType: "exclude"
})

// Increase max file size to 100KB
gitingest({
  url: "https://github.com/user/repo",
  maxFileSize: 100000
})

Limitations

• Content is truncated to 300k characters (server-side limit from gitingest.com)
• For large repositories, use pattern filtering to focus on relevant files
• The maxFileSize parameter controls individual file size, not total output size

diff-summary

Generate a structured summary of git diffs. Use for reviewing branch comparisons or working tree changes. Returns stats, commits, files changed, and full diff in a structured markdown format.

Parameters

Usage Examples

// Analyze working tree changes (staged, unstaged, and untracked files)
diffSummary({})

// Compare feature branch against main
diffSummary({ source: "feature-branch" })

// Compare feature branch against develop
diffSummary({ 
  source: "feature-branch",
  target: "develop"
})

// Compare branches on a different remote
diffSummary({
  source: "feature-branch",
  target: "main",
  remote: "upstream"
})

Output Structure

For branch comparisons:

• Stats Overview: Summary of changes (insertions, deletions)
• Commits to Review: List of commits in the range
• Files Changed: List of modified files
• Full Diff: Complete diff with context

For working tree changes:

• Status Overview: Git status output
• Staged Changes: Stats, files, and diff for staged changes
• Unstaged Changes: Stats, files, and diff for unstaged changes
• Untracked Files: List and diffs for new untracked files

Notes

• When comparing branches, the tool fetches from the remote before generating the diff
• Diffs include 5 lines of context and function context for better readability

prompt-session

Send a message to a child session (subagent) to continue the conversation. Useful for iterating with subagents without creating new sessions.

Parameters

Usage Examples

// Send a message to the last child session
promptSession({ message: "Please also add unit tests for the new function" })

// Send a message to a specific child session
promptSession({
  message: "Can you clarify the error handling approach?",
  sessionId: "abc123"
})

Behavior

• If sessionId is not provided, the tool automatically targets the most recently created child session
• Returns the text response from the child session
• Returns an error message if no child session exists for the current session

list-child-sessions

List all child sessions (subagents) of the current session. Useful for finding specific sessions to target with prompt-session.

Parameters

This tool takes no parameters.

Usage Examples

// List all child sessions
listChildSessions()

Output

Returns a formatted list of child sessions with:

• Session ID
• Session title
• Created and updated timestamps

Example output:

Child sessions (2):

1. [abc123] Code Review Session
   Created: 2024-01-15T10:30:00Z | Updated: 2024-01-15T10:35:00Z

2. [def456] Architecture Discussion
   Created: 2024-01-15T11:00:00Z | Updated: 2024-01-15T11:15:00Z

Blockchain

Tools for querying Ethereum and EVM-compatible blockchains via Etherscan APIs.

All blockchain tools support multiple chains via the chainId parameter:

eth-transaction

Get Ethereum transaction details by transaction hash. Returns status, block, addresses, gas costs, and log count.

Parameters

Usage Examples

// Get transaction on Ethereum mainnet
ethTransaction({ hash: "0x123abc..." })

// Get transaction on Polygon
ethTransaction({ 
  hash: "0x123abc...",
  chainId: "137"
})

eth-address-balance

Get the ETH balance of an Ethereum address. Returns balance in both ETH and Wei.

Parameters

Usage Examples

// Get balance on Ethereum mainnet
ethAddressBalance({ address: "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045" })

// Get balance on Arbitrum
ethAddressBalance({ 
  address: "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045",
  chainId: "42161"
})

eth-address-txs

List Ethereum transactions for an address. Shows incoming and outgoing transactions with values, timestamps, and status.

Parameters

Usage Examples

// List recent transactions on Ethereum mainnet
ethAddressTxs({ address: "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045" })

// List last 50 transactions on Base
ethAddressTxs({ 
  address: "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045",
  limit: 50,
  chainId: "8453"
})

eth-token-transfers

List ERC-20 token transfers for an Ethereum address. Shows token names, symbols, values, and transaction details.

Parameters

Usage Examples

// List recent token transfers on Ethereum mainnet
ethTokenTransfers({ address: "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045" })

// List last 100 token transfers on Optimism
ethTokenTransfers({ 
  address: "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045",
  limit: 100,
  chainId: "10"
})

Hooks

Hooks run actions on session events. Configuration is loaded from standard OpenCode configuration directories.

Configuration Locations

Hooks are loaded from these locations (in order, merged together):

On Windows, ~/.config is preferred for cross-platform consistency. If hooks exist in %APPDATA% but not in ~/.config, the %APPDATA% location is used.

Global hooks run first, then project hooks are added. Hooks from both sources are combined (not overridden).

Configuration File Format

• YAML frontmatter must include a hooks list
• Each hook defines event, actions, and optional conditions
• Hooks for the same event run in declaration order

Example hooks.md:

---
hooks:
  - event: session.idle
    conditions: [hasCodeChange, isMainSession]
    actions:
      - command: simplify-changes
---

Supported Events

Tool Hook Execution Order

1. tool.before.* (all tools)
2. tool.before.<name> (specific tool)
3. (tool executes)
4. tool.after.* (all tools)
5. tool.after.<name> (specific tool)

Blocking Tools with Exit Code 2

For tool.before.* and tool.before.<name> hooks, a bash action returning exit code 2 will block the tool from executing. The stderr output is displayed to the user as the block reason.

Conditions

All listed conditions must pass for the hook to run.

Code extensions treated as "code":

ts, tsx, js, jsx, mjs, cjs, json, yml, yaml, toml, css, scss, sass, less, html, vue, svelte, go, rs, c, h, cpp, cc, cxx, hpp, java, py, rb, php, sh, bash, kt, kts, swift, m, mm, cs, fs, scala, clj, hs, lua.

Supported Actions

Command Action

Execute a plugin command.

# Short form
- command: simplify-changes

# With arguments
- command:
    name: review-pr
    args: "main feature"

If the command exists in config, the plugin reuses its agent and model.

Tool Action

Prompt the session to use a tool with specific arguments.

- tool:
    name: bash
    args: { command: "echo done" }

Bash Action

Execute a shell command directly without involving the LLM. Useful for running linters, formatters, build scripts, or custom automation.

Configuration:

# Short form
- bash: "npm run lint"

# Long form with custom timeout
- bash:
    command: "$OPENCODE_PROJECT_DIR/.opencode/hooks/init.sh"
    timeout: 30000  # milliseconds (default: 60000)

Environment Variables:

The plugin injects these variables into the child process environment:

Stdin JSON Context:

The command receives a JSON object via stdin with session context:

{
  "session_id": "abc123",
  "event": "session.idle",
  "cwd": "/path/to/project",
  "files": ["src/index.ts", "src/utils.ts"]
}

The files array is only present for session.idle events and contains paths modified via write or edit.

For tool hooks (tool.before.*, tool.after.*), additional fields are provided:

{
  "session_id": "abc123",
  "event": "tool.before.write",
  "cwd": "/path/to/project",
  "tool_name": "write",
  "tool_args": { "filePath": "src/index.ts", "content": "..." }
}

Environment Variables vs Stdin JSON:

• Environment variables: Direct access via $VAR, convenient for simple values like paths and IDs
• Stdin JSON: Contains richer context (event type, working directory, modified files), requires parsing with jq or similar

Both mechanisms are complementary. Use environment variables for quick access to project path and session ID; use stdin JSON when you need event details or the list of modified files.

Exit Codes:

Result Feedback:

Bash hook results are automatically sent back to your session:

[BASH HOOK ✓] npm run lint
Exit: 0 | Duration: 1234ms
Stdout: All files passed linting

The feedback includes a status icon (✓ success, ✗ failure), exit code, execution duration, and stdout/stderr output (truncated to 500 characters). This message appears in your session but does not trigger a response from the assistant.

Execution Behavior

• Action errors are logged and do not stop later actions
• session.idle only fires if files were modified via write or edit; the session's modified file list is cleared after the hook runs
• The main session is set on session.created with no parent, or on the first session.idle if needed

Example Hook Configurations

Basic Multi-Hook Setup

---
hooks:
  - event: session.idle
    conditions: [hasCodeChange, isMainSession]
    actions:
      - bash: "npm run lint --fix"
      - command: simplify-changes

  - event: session.created
    actions:
      - bash:
          command: "$OPENCODE_PROJECT_DIR/.opencode/hooks/init.sh"
          timeout: 30000
      - command:
          name: review-pr
          args: "main feature"
---

Simple Lint-on-Idle Hook

hooks:
  - event: session.idle
    conditions: [hasCodeChange]
    actions:
      - bash: "npm run lint --fix"

Custom Initialization Script

.opencode/hooks/init.sh:

#!/bin/bash
set -e

# Read JSON context from stdin
context=$(cat)
session_id=$(echo "$context" | jq -r '.session_id')
event=$(echo "$context" | jq -r '.event')
cwd=$(echo "$context" | jq -r '.cwd')

echo "Session $session_id triggered $event in $cwd"

# Use environment variables
echo "Project: $OPENCODE_PROJECT_DIR"

# Exit 0 for success, 2 to block remaining actions
exit 0

Conditional Blocking Based on Lint Errors

#!/bin/bash
# Run linter and block if critical errors found
if ! npm run lint 2>&1 | grep -q "critical"; then
  exit 0  # Success, continue
else
  echo "Critical lint errors found, blocking further actions"
  exit 2  # Block remaining actions
fi

Block Modifications to Sensitive Files

hooks:
  - event: tool.before.write
    actions:
      - bash: |
          file=$(cat | jq -r '.tool_args.filePath // .tool_args.file_path // .tool_args.path')
          if echo "$file" | grep -qE '\.(env|pem|key)$'; then
            echo "Cannot modify sensitive files: $file" >&2
            exit 2
          fi

  - event: tool.before.edit
    actions:
      - bash: |
          file=$(cat | jq -r '.tool_args.filePath // .tool_args.file_path // .tool_args.path')
          if echo "$file" | grep -qE '\.(env|pem|key)$'; then
            echo "Cannot modify sensitive files: $file" >&2
            exit 2
          fi

Auto-Format TypeScript Files After Write

hooks:
  - event: tool.after.write
    actions:
      - bash: |
          file=$(cat | jq -r '.tool_args.filePath // .tool_args.file_path // .tool_args.path')
          if echo "$file" | grep -qE '\.tsx?$'; then
            npx prettier --write "$file"
          fi

Log All Tool Executions

hooks:
  - event: tool.before.*
    actions:
      - bash: |
          context=$(cat)
          tool=$(echo "$context" | jq -r '.tool_name')
          echo "[$(date)] Tool: $tool" >> /tmp/opencode-tools.log

Configuration Options

The plugin does not require additional configuration. Agents, commands, and skills are loaded automatically from the agent/, command/, and skill/ directories within the plugin. Hooks are loaded from the standard OpenCode configuration directories (see Hooks section).

Supported Code File Extensions

The hasCodeChange condition checks file extensions against the default set listed in the Conditions section. Hooks without any conditions still trigger on any modified file paths tracked via write or edit in the current session.

License

MIT