Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add agents/marcinbunsch/overseer/opencodegit clone --depth 1 https://github.com/marcinbunsch/overseerWhat it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00000 | $0.06113 |
| Opus 5 | $0.00000 | $0.03057 |
| Sonnet 5 | $0.00000 | $0.01223 |
| Haiku 4.5 | $0.00000 | $0.00611 |
Grade D, and why
opencode scanned grade D with 3 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured yesterday.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Downloads and executes remote codehighSupply chain
curl | sh runs whatever the server returns today, which is not necessarily what it returned when this was reviewed.
curl -fsSL https://opencode.ai/install | bash Unrestricted tool accessmediumExcessive agency
A wildcard tool grant or "run any command" leaves no least-privilege boundary at all.
permission: [{ permission: "*", pattern: "*", action: "allow" }], Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
curl -fsSL https://opencode.ai/install | bash How it starts
The opening of the file, as written. The whole thing — 833 lines — stays where its author put it; the contents beside it link to each section on GitHub.
OpenCode
OpenCode is an open-source AI coding agent built for the terminal. Written in TypeScript (Bun runtime), it provides a TUI (Terminal User Interface) for interacting with 75+ AI providers to help with coding tasks, debugging, and more. For GUI integrations, OpenCode exposes a headless HTTP server with OpenAPI 3.1 and supports ACP (Agent Client Protocol) for IDE integration.
Source: https://opencode.ai/docs/
Quick Start
Installation
# Install script (recommended)
curl -fsSL https://opencode.ai/install | bash
# npm
npm i -g opencode-ai@latest
# Homebrew (macOS/Linux)
brew install anomalyco/tap/opencode
# Windows
scoop install opencode
# or
choco install opencode
# Arch Linux
paru -S opencode-bin
Authentication
# Interactive provider setup
opencode
# Then run /connect in the TUI
# Or use environment variables
export ANTHROPIC_API_KEY=your-api-key
export OPENAI_API_KEY=your-api-key
export GEMINI_API_KEY=your-api-key
Supports 75+ providers including:
| Provider | Auth Method |
|---|---|
| Anthropic | OAuth (Claude Pro/Max) or API key |
| OpenAI | OAuth (ChatGPT Plus/Pro) or API key |
| GitHub Copilot | Device auth via github.com/login/device |
| Google Vertex AI | Service account or gcloud auth |
| AWS Bedrock | AWS credentials/IAM roles |
| Groq | API key |
| Azure OpenAI | API key + resource name |
| Local (Ollama) | No auth needed |
Platform Support
- macOS & Linux — fully supported
- Windows — via Scoop, Chocolatey, or WSL
CLI Commands
Interactive Mode (TUI)
opencode # Launch TUI
opencode --continue # Resume last session
opencode --session <id> # Resume specific session
opencode --model claude-sonnet-4-5 # Override model
opencode --agent plan # Start in plan mode
Non-Interactive (run)
opencode run "fix the bug in auth.py" # Single prompt, exits after
opencode run "summarize changes" -f json # JSON output
opencode run "refactor module" -f stream-json # Streaming JSON events
opencode run "continue" --session <id> # Resume session
opencode -p "explain this code" -q # Quiet mode (no spinner)
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- yesterday First seen · 833 lines · 0 tokens per session scan D 0bb8d366c20a
opencode is an agent published in the GitHub repository marcinbunsch/overseer (11 stars, last pushed 2d ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 6,113 tokens. A static security scan graded it D with 3 findings (downloads and executes remote code, unrestricted tool access, makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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