@morphllm/opencode-morph-plugin

opencode-morph-plugin

Source repository: https://github.com/morphllm/opencode-morph-plugin

OpenCode plugin for Morph. Four tools:

• Fast Apply — 10,500+ tok/s code editing with lazy markers
• WarpGrep — fast agentic codebase search, +4% on SWE-Bench Pro, -15% cost
• Public Repo Context — grounded context search for public GitHub repos without cloning
• Compaction — 25,000+ tok/s context compression in sub-2s, +0.6% on SWE-Bench Pro

On production repos and SWE-Bench Pro, enabling WarpGrep and compaction improves task accuracy by 6%, reduces cost, and is net 28% faster.

Quick Start

1. Get a Morph API key

Sign up at morphllm.com/dashboard and export it:

export MORPH_API_KEY="sk-..."

Add this to your shell profile (~/.zshrc, ~/.bashrc, etc.) so it persists.

2. Install the plugin

cd ~/.config/opencode
npm i @morphllm/opencode-morph-plugin

3. Register in opencode.json

Edit ~/.config/opencode/opencode.json:

{
  "$schema": "https://opencode.ai/config.json",
  "plugin": ["@morphllm/opencode-morph-plugin"],
  "instructions": [
    "node_modules/@morphllm/opencode-morph-plugin/instructions/morph-tools.md"
  ]
}

4. Start OpenCode

opencode

You should see morph_edit, warpgrep_codebase_search, and warpgrep_github_search in the available tools. Compaction runs automatically in the background.

Compaction

Context compression via the Morph Compact API. Runs automatically before each LLM call when the conversation exceeds a token threshold.

How it works

• Before each LLM call, the plugin estimates the total characters in the conversation
• If the estimate exceeds the threshold, older messages are compressed via the Morph Compact API (~250ms)
• The compressed result is cached ("frozen") and reused on subsequent calls for prompt cache stability
• Only the most recent user message is kept uncompacted

The LLM receives compressed history + your latest prompt. The "Context: X tokens" number in the sidebar reflects the actual tokens sent (post-compaction).

Configuring the compaction threshold

By default, compaction triggers at 70% of the model's context window. You can override this with a fixed token limit:

# Compact when conversation exceeds 20,000 tokens
export MORPH_COMPACT_TOKEN_LIMIT=20000

For aggressive compaction during testing:

export MORPH_COMPACT_TOKEN_LIMIT=5000

Verifying compaction is working

Check the OpenCode log files in ~/.local/share/opencode/log/. Look for entries with service=morph:

grep "service=morph" ~/.local/share/opencode/log/*.log | grep -i compact

When compaction fires, you'll see entries like:

INFO service=morph First compaction: 2 messages (30137 chars), keeping 1 recent. Threshold crossed: 30178 >= 15000
INFO service=morph Compact: 2 messages -> 2 frozen (15142 chars). Messages: 3 -> 3. Ratio: 45% kept (244ms)

You'll also see a toast notification in the OpenCode UI when compaction triggers.

On subsequent LLM calls (before re-compaction is needed), you'll see:

INFO service=morph Under threshold - reusing frozen block. Messages: 5 -> 5

Tools

Fast Apply (morph_edit)

10,500+ tok/s code merging. The LLM writes partial snippets with lazy markers (// ... existing code ...), Morph merges them into the full file.

Best for large files (300+ lines) and multiple scattered changes. For small exact replacements, use OpenCode's built-in edit tool.

WarpGrep (warpgrep_codebase_search)

Fast agentic codebase search. Runs multi-turn ripgrep + file reads to find relevant code contexts. Sub-6s per query. Best for exploratory queries ("how does X work?", "where is Y handled?").

Public Repo Context (warpgrep_github_search)

Search public GitHub repositories without cloning. Pass an owner/repo or GitHub URL and a search query. Returns relevant file contexts from Morph's indexed public repo search.

Configuration

All configuration is via environment variables.

Variable	Default	Description
MORPH_API_KEY	required	Your Morph API key
MORPH_COMPACT_TOKEN_LIMIT	auto (70% of model window)	Fixed token threshold for compaction
MORPH_COMPACT_CONTEXT_THRESHOLD	0.7	Fraction of model context window to trigger compaction (used when TOKEN_LIMIT is not set)
MORPH_COMPACT_PRESERVE_RECENT	1	Number of recent messages to keep uncompacted
MORPH_COMPACT_RATIO	0.3	Target compression ratio (0.05-1.0, lower = more aggressive)
MORPH_COMPACT	true	Set false to disable compaction
MORPH_EDIT	true	Set false to disable Fast Apply
MORPH_WARPGREP	true	Set false to disable WarpGrep
MORPH_WARPGREP_GITHUB	true	Set false to disable public repo search

Development

bun install
bun test
bun run build
bun run typecheck

To test locally with OpenCode, symlink the plugin:

rm -rf ~/.config/opencode/node_modules/@morphllm/opencode-morph-plugin
ln -s /path/to/this/repo ~/.config/opencode/node_modules/@morphllm/opencode-morph-plugin
bun run build  # rebuild after changes

License

MIT