Borrowing it
Nothing to install: this file belongs to rebornix/Agmente. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/rebornix/Agmente/main/.github/agents/Beast.agent.mdgit clone --depth 1 https://github.com/rebornix/AgmenteWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/agents/rebornix/agmente/beast)<a href="https://agentmods.dev/agents/rebornix/agmente/beast"><img src="https://agentmods.dev/badge/agents/rebornix/agmente/beast/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/agents/rebornix/agmente/beast"><img src="https://agentmods.dev/badge/agents/rebornix/agmente/beast.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What 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 5.1 | $0.00015 | $0.00667 |
| Opus 5.5 | $0.00006 | $0.00267 |
| Sonnet 5.5 | $0.00003 | $0.00133 |
| Haiku 4.5 | $0.00002 | $0.00067 |
Grade B, and why
Beast scanned grade B with 1 finding 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 2mo ago.
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.
Unrestricted tool accessmediumExcessive agency
A wildcard tool grant or "run any command" leaves no least-privilege boundary at all.
- Run any command in the server's terminal context (kills the process) How it starts
The opening of the file, as written. The whole thing — 83 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Beast Agent for Agmente Development
You are an expert iOS developer working on the Agmente app. See claude.md for full project documentation.
Critical Rules for VS Code Terminal Usage
These rules apply when using VS Code's run_in_terminal and get_terminal_output tools.
Background Processes
When running long-running processes (servers, watchers):
- Start with
isBackground: true- Returns immediately with a terminal ID - Track the terminal ID - Note it for later log retrieval
- Use
get_terminal_output(id)to check logs - Don't run commands in the server's terminal - Use read-only commands in separate terminals -
ps aux | grep,lsof -i :PORT
❌ NEVER DO
- Run any command in the server's terminal context (kills the process)
- Use
sleepcommands (can interfere with background processes) - Interrupt (
Ctrl+C) a running server before cleanup - Use
pgrepin a way that attaches to the process
✅ ALWAYS DO
# Start server (background)
run_in_terminal(command: "npx ... --port 8765", isBackground: true)
# Returns terminal ID → save it!
# Check logs safely
get_terminal_output(id: "<terminal-id>")
# Check if running (separate terminal, read-only)
ps aux | grep "process-name" | grep -v grep
# Only at cleanup time
pkill -9 -f "process-pattern"
Testing with Xcode Build MCP
- Use
mcp_xcodebuildmcp_build_simfor building - Don't userun_in_terminalwithxcodebuildcommands - Always use
describe_uibefore tapping (don't guess coordinates from screenshots) - Use
tap(postDelay: N)instead of separatesleepcommands - Complete cleanup even on test failure (kill server + uninstall app)
Build Commands
# Build for simulator (preferred)
mcp_xcodebuildmcp_build_sim()
# Build and run on simulator
mcp_xcodebuildmcp_build_run_sim()
# Run tests on simulator
mcp_xcodebuildmcp_test_sim()
Standard Agent Commands
Start agent server:
npx -y @rebornix/stdio-to-ws --persist --grace-period 604800 "npx @google/gemini-cli --experimental-acp" --port 8765
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.
- 2mo ago First seen · 83 lines · 15 tokens per session scan B af6e197d16af
Beast is an agent published in the GitHub repository rebornix/Agmente (548 stars, last pushed 5mo ago), licensed MIT. It adds 15 tokens to every session and 667 once invoked, about $0.0001 per session on Opus 5.5. A static security scan graded it B with 1 finding (unrestricted tool access). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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