Beast

An iOS development agent for the Agmente app, connected to a VS Code terminal and Xcode tools. iOS is Apple's operating system for iPhone and iPad.

In plain words
What is it for?
Use it for Agmente iOS development, including terminal work, Xcode integration, background server checks, and safe retrieval of process logs.
Why use it?
It provides project-specific guidance for running commands and handling background processes without disrupting development servers.

Agent

Install

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.

agentmods
npx agentmods add agents/rebornix/agmente/beast
Clone the repo
git clone --depth 1 https://github.com/rebornix/Agmente
Per session 15 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 667 The whole file, excluding the scripts and references it only reads on demand.
Security scan B 1 finding. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5 $0.00015 $0.00667
Opus 5 $0.00008 $0.00333
Sonnet 5 $0.00003 $0.00133
Haiku 4.5 $0.00002 $0.00067

Measured 3d ago against content hash af6e197d16af, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

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 3d 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)
.github/agents/Beast.agent.md · 83 lines

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):

  1. Start with isBackground: true - Returns immediately with a terminal ID
  2. Track the terminal ID - Note it for later log retrieval
  3. Use get_terminal_output(id) to check logs - Don't run commands in the server's terminal
  4. 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 sleep commands (can interfere with background processes)
  • Interrupt (Ctrl+C) a running server before cleanup
  • Use pgrep in 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_sim for building - Don't use run_in_terminal with xcodebuild commands
  • Always use describe_ui before tapping (don't guess coordinates from screenshots)
  • Use tap(postDelay: N) instead of separate sleep commands
  • 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

Read the full file on GitHub · 83 lines

Changes

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.

  1. 3d ago First seen · 83 lines · 15 tokens per session scan B af6e197d16af

Subscribe to this mod's changes

Beast is an agent published in the GitHub repository rebornix/Agmente (540 stars, last pushed 3mo ago), licensed MIT. It adds 15 tokens to every session and 667 once invoked, about $0.0001 per session on Opus 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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