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/rivet-dev/sandbox-agent/opencodegit clone --depth 1 https://github.com/rivet-dev/sandbox-agentWhat 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 | $0.04276 |
| Opus 5 | $0.00000 | $0.02138 |
| Sonnet 5 | $0.00000 | $0.00855 |
| Haiku 4.5 | $0.00000 | $0.00428 |
Grade A, and why
opencode scanned grade A with 0 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.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 649 lines — stays where its author put it; the contents beside it link to each section on GitHub.
OpenCode Research
Research notes on OpenCode's configuration, credential discovery, and runtime behavior based on agent-jj implementation.
Overview
- Provider: Multi-provider (OpenAI, Anthropic, others)
- Execution Method: Embedded server via SDK, or CLI binary
- Session Persistence: Session ID (string)
- SDK:
@opencode-ai/sdk(server + client) - Binary Location:
~/.opencode/bin/opencode - Written in: Go (with Bubble Tea TUI)
CLI Usage (Alternative to SDK)
OpenCode can be used as a standalone binary instead of embedding the SDK:
Interactive TUI Mode
opencode # Start TUI in current directory
opencode /path/to/project # Start in specific directory
opencode -c # Continue last session
opencode -s SESSION_ID # Continue specific session
Non-Interactive Mode (opencode run)
opencode run "your prompt here"
opencode run --format json "prompt" # Raw JSON events output
opencode run -m anthropic/claude-sonnet-4-20250514 "prompt"
opencode run --agent plan "analyze this code"
opencode run -c "follow up question" # Continue last session
opencode run -s SESSION_ID "prompt" # Continue specific session
opencode run -f file1.ts -f file2.ts "review these files"
Key CLI Flags
| Flag | Description |
|---|---|
--format json |
Output raw JSON events (for parsing) |
-m, --model PROVIDER/MODEL |
Model in format provider/model |
--agent AGENT |
Agent to use (build, plan) |
-c, --continue |
Continue last session |
-s, --session ID |
Continue specific session |
-f, --file FILE |
Attach file(s) to message |
--attach URL |
Attach to running server |
--port PORT |
Local server port |
--variant VARIANT |
Reasoning effort (e.g., high, max) |
Headless Server Mode
opencode serve # Start headless server
opencode serve --port 4096 # Specific port
opencode attach http://localhost:4096 # Attach to running server
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 · 649 lines · 0 tokens per session scan A c1289d86728d
opencode is an agent published in the GitHub repository rivet-dev/sandbox-agent (1,551 stars, last pushed 2mo ago), licensed Apache-2.0. It costs nothing until one of its globs matches a file; then it loads 4,276 tokens. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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