/opencode

name: opencode
description: "Delegate coding to OpenCode CLI (features, PR review)."
version: 1.2.0
author: Hermes Agent
license: MIT
platforms: [linux, macos, windows]
metadata:
  hermes:
    tags: [Coding-Agent, OpenCode, Autonomous, Refactoring, Code-Review]
    related_skills: [claude-code, codex, hermes-agent]

OpenCode CLI

Use [OpenCode](https://opencode.ai) as an autonomous coding worker orchestrated by Hermes terminal/process tools. OpenCode is a provider-agnostic, open-source AI coding agent with a TUI and CLI.

When to Use

• User explicitly asks to use OpenCode
• You want an external coding agent to implement/refactor/review code
• You need long-running coding sessions with progress checks
• You want parallel task execution in isolated workdirs/worktrees

Prerequisites

• OpenCode installed: `npm i -g opencode-ai@latest` or `brew install anomalyco/tap/opencode`
• Auth configured: `opencode auth login` or set provider env vars (OPENROUTER_API_KEY, etc.)
• Verify: `opencode auth list` should show at least one provider
• Git repository for code tasks (recommended)
• `pty=true` for interactive TUI sessions

Binary Resolution (Important)

Shell environments may resolve different OpenCode binaries. If behavior differs between your terminal and Hermes, check:

terminal(command="which -a opencode")
terminal(command="opencode --version")

If needed, pin an explicit binary path:

terminal(command="$HOME/.opencode/bin/opencode run '...'", workdir="~/project", pty=true)

One-Shot Tasks

Use `opencode run` for bounded, non-interactive tasks:

terminal(command="opencode run 'Add retry logic to API calls and update tests'", workdir="~/project")

Attach context files with `-f`:

terminal(command="opencode run 'Review this config for security issues' -f config.yaml -f .env.example", workdir="~/project")

Show model thinking with `--thinking`:

terminal(command="opencode run 'Debug why tests fail in CI' --thinking", workdir="~/project")

Force a specific model:

terminal(command="opencode run 'Refactor auth module' --model openrouter/anthropic/claude-sonnet-4", workdir="~/project")

Interactive Sessions (Background)

For iterative work requiring multiple exchanges, start the TUI in background:

terminal(command="opencode", workdir="~/project", background=true, pty=true)
# Returns session_id

# Send a prompt
process(action="submit", session_id="<id>", data="Implement OAuth refresh flow and add tests")

# Monitor progress
process(action="poll", session_id="<id>")
process(action="log", session_id="<id>")

# Send follow-up input
process(action="submit", session_id="<id>", data="Now add error handling for token expiry")

# Exit cleanly — Ctrl+C
process(action="write", session_id="<id>", data="\x03")
# Or just kill the process
process(action="kill", session_id="<id>")

**Important:** Do NOT use `/exit` — it is not a valid OpenCode command and will open an agent selector dialog instead. Use Ctrl+C (`\x03`) or `process(action="kill")` to exit.

TUI Keybindings

| Key | Action | |-----|--------| | `Enter` | Submit message (press twice if needed) | | `Tab` | Switch between agents (build/plan) | | `Ctrl+P` | Open command palette | | `Ctrl+X L` | Switch session | | `Ctrl+X M` | Switch model | | `Ctrl+X N` | New session | | `Ctrl+X E` | Open editor | | `Ctrl+C` | Exit OpenCode |

Resuming Sessions

After exiting, OpenCode prints a session ID. Resume with:

terminal(command="opencode -c", workdir="~/project", background=true, pty=true)  # Continue last session
terminal(command="opencode -s ses_abc123", workdir="~/project", background=true, pty=true)  # Specific session

Common Flags

| Flag | Use | |------|-----| | `run 'prompt'` | One-shot execution and exit | | `--continue` / `-c` | Continue the last OpenCode session | | `--session <id>` / `-s` | Continue a specific session | | `--agent <name>` | Choose OpenCode agent (build or plan) | | `--model provider/model` | Force specific model | | `--format json` | Machine-readable output/events | | `--file <path>` / `-f` | Attach file(s) to the message | | `--thinking` | Show model thinking blocks | | `--variant <level>` | Reasoning effort (high, max, minimal) | | `--title <name>` | Name the session | | `--attach <url>` | Connect to a running opencode server |

Procedure

1. Verify tool readiness:

• `terminal(command="opencode --version")`
• `terminal(command="opencode auth list")`

2. For bounded tasks, use `opencode run '...'` (no pty needed). 3. For iterative tasks, start `opencode` with `background=true, pty=true`. 4. Monitor long tasks with `process(action="poll"|"log")`. 5. If OpenCode asks for input, respond via `process(action="submit", ...)`. 6. Exit with `process(action="write", data="\x03")` or `process(action="kill")`. 7. Summarize file changes, test results, and next steps back to user.

PR Review Workflow

OpenCode has a built-in PR command:

terminal(command="opencode pr 42", workdir="~/project", pty=true)

Or review in a temporary clone for isolation:

terminal(command="REVIEW=$(mktemp -d) && git clone https://github.com/user/repo.git $REVIEW && cd $REVIEW && opencode run 'Review this PR vs main. Report bugs, security risks, test gaps, and style issues.' -f $(git diff origin/main --name-only | head -20 | tr '\n' ' ')", pty=true)

Parallel Work Pattern

Use separate workdirs/worktrees to avoid collisions:

terminal(command="opencode run 'Fix issue #101 and commit'", workdir="/tmp/issue-101", background=true, pty=true)
terminal(command="opencode run 'Add parser regression tests and commit'", workdir="/tmp/issue-102", background=true, pty=true)
process(action="list")

Session & Cost Management

List past sessions:

terminal(command="opencode session list")

Check token usage and costs:

terminal(command="opencode stats")
terminal(command="opencode stats --days 7 --models anthropic/claude-sonnet-4")
`