OpenCode ACP Skill

Control OpenCode directly via the Agent Client Protocol (ACP).

Metadata

For ACP Protocol Docs (for Agents/LLMs): https://agentclientprotocol.com/llms.txt
GitHub Repo: https://github.com/bjesuiter/opencode-acp-skill
If you have issues with this skill, please open an issue ticket here: https://github.com/bjesuiter/opencode-acp-skill/issues

Quick Reference

Action	How
Start OpenCode	`bash(command: "opencode acp", background: true)`
Send message	`process.write(sessionId, data: "<json-rpc>\n")`
Read response	`process.poll(sessionId)` - repeat every 2 seconds
Stop OpenCode	`process.kill(sessionId)`
List sessions	`bash(command: "opencode session list", workdir: "...")`
Resume session	List sessions → ask user → `session/load`
Check version	`bash(command: "opencode --version")`

Starting OpenCode

bash(
  command: "opencode acp",
  background: true,
  workdir: "/path/to/your/project"
)

Save the returned

sessionId

- you'll need it for all subsequent commands.

Protocol Basics

All messages are JSON-RPC 2.0 format
Messages are newline-delimited (end each with
```
\n
```
)
Maintain a message ID counter starting at 0

Step-by-Step Workflow

Step 1: Initialize Connection

Send immediately after starting OpenCode:

{"jsonrpc":"2.0","id":0,"method":"initialize","params":{"protocolVersion":1,"clientCapabilities":{"fs":{"readTextFile":true,"writeTextFile":true},"terminal":true},"clientInfo":{"name":"clawdbot","title":"Clawdbot","version":"1.0.0"}}}

Poll for response. Expect

result.protocolVersion: 1

Step 2: Create Session

{"jsonrpc":"2.0","id":1,"method":"session/new","params":{"cwd":"/path/to/project","mcpServers":[]}}

Poll for response. Save

result.sessionId

(e.g.,

"sess_abc123"

Step 3: Send Prompts

{"jsonrpc":"2.0","id":2,"method":"session/prompt","params":{"sessionId":"sess_abc123","prompt":[{"type":"text","text":"Your question here"}]}}

Poll every 2 seconds. You'll receive:

```
session/update
```
notifications (streaming content)
Final response with
```
result.stopReason
```

Step 4: Read Responses

Each poll may return multiple lines. Parse each line as JSON:

Notifications:
```
method: "session/update"
```
- collect these for the response
Response: Has
```
id
```
matching your request - stop polling when
```
stopReason
```
appears

Step 5: Cancel (if needed)

{"jsonrpc":"2.0","method":"session/cancel","params":{"sessionId":"sess_abc123"}}

No response expected - this is a notification.

State to Track

Per OpenCode instance, track:

```
processSessionId
```
- from bash tool (clawdbot's process ID)
```
opencodeSessionId
```
- from session/new response (OpenCode's session ID)
```
messageId
```
- increment for each request you send

Polling Strategy

Poll every 2 seconds
Continue until you receive a response with
```
stopReason
```
Max wait: 5 minutes (150 polls)
If no response, consider the operation timed out

Common Stop Reasons

stopReason	Meaning
`end_turn`	Agent finished responding
`cancelled`	You cancelled the prompt
`max_tokens`	Token limit reached

Error Handling

Issue	Solution
Empty poll response	Keep polling - agent is thinking
Parse error	Skip malformed line, continue
Process exited	Restart OpenCode
No response after 5min	Kill process, start fresh

Example: Complete Interaction

1. bash(command: "opencode acp", background: true, workdir: "/home/user/myproject")
   -> processSessionId: "bg_42"


process.write(sessionId: "bg_42", data: '{"jsonrpc":"2.0","id":0,"method":"initialize",...}\n')
process.poll(sessionId: "bg_42") -> initialize response


process.write(sessionId: "bg_42", data: '{"jsonrpc":"2.0","id":1,"method":"session/new","params":{"cwd":"/home/user/myproject","mcpServers":[]}}\n')
process.poll(sessionId: "bg_42") -> opencodeSessionId: "sess_xyz789"


process.write(sessionId: "bg_42", data: '{"jsonrpc":"2.0","id":2,"method":"session/prompt","params":{"sessionId":"sess_xyz789","prompt":[{"type":"text","text":"List all TypeScript files"}]}}\n')


process.poll(sessionId: "bg_42") every 2 sec until stopReason
-> Collect all session/update content
-> Final response: stopReason: "end_turn"


When done: process.kill(sessionId: "bg_42")

Resume Session

Resume a previous OpenCode session by letting the user choose from available sessions.

Step 1: List Available Sessions

bash(command: "opencode session list", workdir: "/path/to/project")

Example output:

ID                                  Updated              Messages
ses_451cd8ae0ffegNQsh59nuM3VVy      2026-01-11 15:30     12
ses_451a89e63ffea2TQIpnDGtJBkS      2026-01-10 09:15     5
ses_4518e90d0ffeJIpOFI3t3Jd23Q      2026-01-09 14:22     8

Step 2: Ask User to Choose

Present the list to the user and ask which session to resume:

"Which session would you like to resume?

ses_451cd8ae... (12 messages, updated 2026-01-11)
ses_451a89e6... (5 messages, updated 2026-01-10)
ses_4518e90d... (8 messages, updated 2026-01-09)

Enter session number or ID:"

Step 3: Load Selected Session

Once user responds (e.g., "1", "the first one", or "ses_451cd8ae..."):

Start OpenCode ACP:

bash(command: "opencode acp", background: true, workdir: "/path/to/project")

Initialize:

{"jsonrpc":"2.0","id":0,"method":"initialize","params":{...}}

Load the session:

{"jsonrpc":"2.0","id":1,"method":"session/load","params":{"sessionId":"ses_451cd8ae0ffegNQsh59nuM3VVy","cwd":"/path/to/project","mcpServers":[]}}

Note:

session/load

requires

cwd

and

mcpServers

parameters.

On load, OpenCode streams the full conversation history back to you.

Resume Workflow Summary

function resumeSession(workdir):
    # List available sessions
    output = bash("opencode session list", workdir: workdir)
    sessions = parseSessionList(output)
if sessions.empty:
    notify(&quot;No previous sessions found. Starting fresh.&quot;)
    return createNewSession(workdir)

# Ask user to choose
choice = askUser(&quot;Which session to resume?&quot;, sessions)
selectedId = matchUserChoice(choice, sessions)

# Start OpenCode and load session
process = bash(&quot;opencode acp&quot;, background: true, workdir: workdir)
initialize(process)

session_load(process, selectedId, workdir, mcpServers: [])

notify(&quot;Session resumed. Conversation history loaded.&quot;)
return process

Important Notes

History replay: On load, all previous messages stream back
Memory preserved: Agent remembers the full conversation
Process independent: Sessions survive OpenCode restarts

Updating OpenCode

OpenCode auto-updates when restarted. Use this workflow to check and trigger updates.

Step 1: Check Current Version

bash(command: "opencode --version")

Returns something like:

opencode version 1.1.13

Extract the version number (e.g.,

1.1.13

Step 2: Check Latest Version

webfetch(url: "https://github.com/anomalyco/opencode/releases/latest", format: "text")

The redirect URL contains the latest version tag:

Redirects to:

https://github.com/anomalyco/opencode/releases/tag/v1.2.0

Extract version from the URL path (e.g.,
```
1.2.0
```
)

Step 3: Compare and Update

If latest version > current version:

Stop all running OpenCode processes:

process.list()  # Find all "opencode acp" processes
process.kill(sessionId) # For each running instance

Restart instances (OpenCode auto-downloads new binary on start):

bash(command: "opencode acp", background: true, workdir: "/path/to/project")

Re-initialize each instance (initialize + session/load for existing sessions)

Step 4: Verify Update

bash(command: "opencode --version")

If version still doesn't match latest:

Inform user: "OpenCode auto-update may have failed. Current: X.X.X, Latest: Y.Y.Y"

Suggest manual update:

curl -fsSL https://opencode.dev/install | bash

Update Workflow Summary

function updateOpenCode():
    current = bash("opencode --version")  # e.g., "1.1.13"
latestPage = webfetch(&quot;https://github.com/anomalyco/opencode/releases/latest&quot;)
latest = extractVersionFromRedirectUrl(latestPage)  # e.g., &quot;1.2.0&quot;

if semverCompare(latest, current) &gt; 0:
    # Stop all instances
    for process in process.list():
        if process.command.includes(&quot;opencode&quot;):
            process.kill(process.sessionId)
    
    # Wait briefly for processes to terminate
    sleep(2 seconds)
    
    # Restart triggers auto-update
    bash(&quot;opencode acp&quot;, background: true)
    
    # Verify
    newVersion = bash(&quot;opencode --version&quot;)
    if newVersion != latest:
        notify(&quot;Auto-update may have failed. Manual update recommended.&quot;)
else:
    notify(&quot;OpenCode is up to date: &quot; + current)

Important Notes

Sessions persist:
```
opencodeSessionId
```
survives restarts — use
```
session/load
```
to recover
Auto-update: OpenCode downloads new binary automatically on restart
No data loss: Conversation history is preserved server-side

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OpenCode ACP Skill

Metadata

Quick Reference

Starting OpenCode

Protocol Basics

Step-by-Step Workflow

Step 1: Initialize Connection

Step 2: Create Session

Step 3: Send Prompts

Step 4: Read Responses

Step 5: Cancel (if needed)

State to Track

Polling Strategy

Common Stop Reasons

Error Handling

Example: Complete Interaction

Resume Session

Step 1: List Available Sessions

Step 2: Ask User to Choose

Step 3: Load Selected Session

Resume Workflow Summary

Important Notes

Updating OpenCode

Step 1: Check Current Version

Step 2: Check Latest Version

Step 3: Compare and Update

Step 4: Verify Update

Update Workflow Summary

Important Notes

Quick Start

Manual Installation

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