diff --git a/roboco/llm/providers/grok_cli_config.py b/roboco/llm/providers/grok_cli_config.py
new file mode 100644
index 00000000..f7881157
--- /dev/null
+++ b/roboco/llm/providers/grok_cli_config.py
@@ -0,0 +1,198 @@
+"""Render a Grok CLI agent's runtime config + per-role flags at container start.
+
+The ``roboco-agent-grok-cli`` image's entrypoint runs ``python -m
+roboco.llm.providers.grok_cli_config`` to turn the mounted Claude Code
+``mcp-config.json`` into ``~/.grok/config.toml`` (``[mcp_servers]``) and to
+compute the per-role ``grok -p`` flags (permissions / reasoning effort / turn
+cap), written one token per line to an args file the entrypoint splices into the
+command. Keeping the translation in importable Python (not a shell heredoc)
+makes it unit-testable.
+
+Parity with ``ClaudeCodeProvider``'s per-role permissions, expressed as native
+grok flags instead of an opencode permission block + a JS guard plugin:
+
+  * **subagents** — every role gets ``--disallowed-tools Agent``: no RoboCo agent
+    spawns the CLI's own subagents (work is driven through the gateway verbs).
+  * **editing** — roles that don't write code (``role_config.allows_write`` is
+    False) have the edit tool removed (``--disallowed-tools search_replace``).
+  * **shell** — roles that never run a shell (review / board) have bash removed
+    (``--disallowed-tools run_terminal_cmd``).
+  * **git mutation** — bash-capable roles keep a shell, but raw git mutation is
+    denied (``--deny "Bash(git push*)"`` ...): agents commit / push through the
+    gateway verbs, never raw git (the opencode secret-scrub git-ops rule, ported).
+  * **destructive** — ``--deny "Bash(rm -rf*)"`` for every bash-capable role.
+  * **reasoning** — ``--effort`` by role (``low`` for coordination / docs / board;
+    full for the code-quality roles). A global ``ROBOCO_GROK_REASONING_EFFORT``
+    override wins.
+"""
+
+from __future__ import annotations
+
+import json
+import os
+from pathlib import Path
+from typing import Any
+
+import tomli_w
+
+from roboco.agents_config import get_agent_role
+from roboco.services.gateway.role_config import get_role_config
+
+# grok reads its global config from ``$HOME/.grok/config.toml`` (the agent's HOME
+# is ``/home/agent``; the host ``auth.json`` is mounted alongside it).
+GROK_CONFIG_PATH = Path.home() / ".grok" / "config.toml"
+# The entrypoint reads the computed flags (one token per line) from this file.
+GROK_ARGS_PATH = Path(os.environ.get("ROBOCO_GROK_ARGS_FILE", "/tmp/roboco-grok-args"))
+
+# Hard ceiling on agentic turns (loop guard; replaces the opencode budget-feed
+# loop cap). Operator-tunable.
+_DEFAULT_MAX_TURNS = 200
+
+# Roles that request reduced reasoning (grok bills reasoning at the output rate,
+# so it dominates cost). Code-quality roles keep full reasoning; coordination /
+# docs / board roles ask for ``low``.
+_MINIMAL_REASONING_ROLES = frozenset(
+    {
+        "cell_pm",
+        "main_pm",
+        "documenter",
+        "product_owner",
+        "head_marketing",
+        "auditor",
+        "prompter",
+        "secretary",
+    }
+)
+_FULL_REASONING_OVERRIDES = frozenset({"default", "full", "none", ""})
+
+# Roles that legitimately run a shell. Review / board roles never do.
+_BASH_ROLES = frozenset({"developer", "documenter", "cell_pm", "main_pm"})
+
+# Grok CLI tool IDs (from the CLI's --tools/--disallowed-tools reference).
+_TOOL_SHELL = "run_terminal_cmd"
+_TOOL_EDIT = "search_replace"
+_TOOL_SUBAGENT = "Agent"
+
+# Raw git mutation is gateway-mediated (the commit / open_pr verbs); agents never
+# push or commit via raw bash. Denied for every bash-capable role.
+_GIT_MUTATE_DENY = (
+    "Bash(git push*)",
+    "Bash(git fetch*)",
+    "Bash(git pull*)",
+    "Bash(git clone*)",
+    "Bash(git commit*)",
+    "Bash(git remote*)",
+    "Bash(git reset*)",
+)
+_DESTRUCTIVE_DENY = ("Bash(rm -rf*)",)
+
+
+def render_config_toml(mcp_config: dict[str, Any]) -> str:
+    """Translate Claude Code ``mcpServers`` into grok's ``[mcp_servers]`` TOML.
+
+    ``{"command": "uv", "args": [...], "env": {...}}`` becomes a
+    ``[mcp_servers.<name>]`` table with the same fields. Returns an empty string
+    when there are no servers (a config with no MCP block is valid).
+    """
+    servers: dict[str, dict[str, Any]] = {}
+    for name, spec in (mcp_config.get("mcpServers") or {}).items():
+        block: dict[str, Any] = {
+            "command": str(spec.get("command", "")),
+            "args": [str(a) for a in (spec.get("args") or [])],
+        }
+        env = spec.get("env") or {}
+        if env:
+            block["env"] = {str(k): str(v) for k, v in env.items()}
+        servers[str(name)] = block
+    return tomli_w.dumps({"mcp_servers": servers}) if servers else ""
+
+
+def _allows_write(role: str) -> bool:
+    """True if the role writes code (``role_config.allows_write``)."""
+    try:
+        return bool(get_role_config(role).allows_write)
+    except KeyError:
+        return False
+
+
+def _disallowed_tools(role: str) -> str:
+    """Comma-separated ``--disallowed-tools`` value for a role."""
+    tools = [_TOOL_SUBAGENT]
+    if role not in _BASH_ROLES:
+        tools.append(_TOOL_SHELL)
+    if not _allows_write(role):
+        tools.append(_TOOL_EDIT)
+    return ",".join(tools)
+
+
+def _deny_rules(role: str) -> list[str]:
+    """``--deny`` permission rules for a role (only bash-capable roles need any)."""
+    if role not in _BASH_ROLES:
+        return []  # bash removed entirely → nothing left to gate
+    return [*_DESTRUCTIVE_DENY, *_GIT_MUTATE_DENY]
+
+
+def _effort_for(role: str) -> str | None:
+    """Resolve ``--effort`` for a role; ``None`` keeps grok's default reasoning.
+
+    A global ``ROBOCO_GROK_REASONING_EFFORT`` override wins over the per-role
+    default (``default`` / ``full`` / empty disables the reduction).
+    """
+    override = os.environ.get("ROBOCO_GROK_REASONING_EFFORT", "").strip()
+    if override:
+        return (
+            None if override.lower() in _FULL_REASONING_OVERRIDES else override.lower()
+        )
+    return "low" if role in _MINIMAL_REASONING_ROLES else None
+
+
+def grok_cli_args(agent_id: str, *, max_turns: int = _DEFAULT_MAX_TURNS) -> list[str]:
+    """The per-role ``grok -p`` flag tokens for an agent (excludes ``-p``/model/cwd).
+
+    Order: tool removal, turn cap, deny rules, then effort. Each token is a
+    separate list element so the entrypoint can splice them without shell quoting.
+    """
+    role = get_agent_role(agent_id) or ""
+    args: list[str] = ["--disallowed-tools", _disallowed_tools(role)]
+    args += ["--max-turns", str(max_turns)]
+    for rule in _deny_rules(role):
+        args += ["--deny", rule]
+    effort = _effort_for(role)
+    if effort:
+        args += ["--effort", effort]
+    return args
+
+
+def _load_mcp_config(path: str) -> dict[str, Any]:
+    """Load the mounted mcp-config.json, tolerating a missing / invalid file."""
+    try:
+        with Path(path).open(encoding="utf-8") as fh:
+            loaded = json.load(fh)
+            return loaded if isinstance(loaded, dict) else {}
+    except (OSError, json.JSONDecodeError):
+        return {}
+
+
+def main() -> int:
+    """Entrypoint: write ``~/.grok/config.toml`` + the per-role args file."""
+    agent_id = os.environ.get("ROBOCO_AGENT_ID", "")
+    mcp_path = os.environ.get("ROBOCO_MCP_CONFIG", "/app/mcp-config.json")
+    try:
+        max_turns = int(
+            os.environ.get("ROBOCO_GROK_MAX_TURNS", str(_DEFAULT_MAX_TURNS))
+        )
+    except ValueError:
+        max_turns = _DEFAULT_MAX_TURNS
+
+    GROK_CONFIG_PATH.parent.mkdir(parents=True, exist_ok=True)
+    GROK_CONFIG_PATH.write_text(
+        render_config_toml(_load_mcp_config(mcp_path)), encoding="utf-8"
+    )
+    GROK_ARGS_PATH.write_text(
+        "\n".join(grok_cli_args(agent_id, max_turns=max_turns)) + "\n", encoding="utf-8"
+    )
+    return 0
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())
diff --git a/tests/unit/llm/providers/test_grok_cli_config.py b/tests/unit/llm/providers/test_grok_cli_config.py
new file mode 100644
index 00000000..d6a61ab9
--- /dev/null
+++ b/tests/unit/llm/providers/test_grok_cli_config.py
@@ -0,0 +1,94 @@
+"""grok_cli_config — mcp-config → config.toml + per-role grok CLI flags."""
+
+from __future__ import annotations
+
+import tomllib
+from typing import TYPE_CHECKING
+
+from roboco.llm.providers import grok_cli_config as gc
+
+if TYPE_CHECKING:
+    import pytest
+
+_SAMPLE_MCP = {
+    "mcpServers": {
+        "roboco-flow": {
+            "command": "uv",
+            "args": ["run", "--no-sync", "python", "-m", "roboco.mcp.flow_server"],
+            "env": {"ROBOCO_AGENT_ID": "be-dev-1", "ROBOCO_AGENT_TOKEN": "tok-123"},
+        },
+        "roboco-do": {"command": "uv", "args": ["run", "x"]},
+    }
+}
+
+
+def _disallowed(args: list[str]) -> str:
+    return args[args.index("--disallowed-tools") + 1]
+
+
+def test_render_config_toml_is_valid_toml_and_injects_env() -> None:
+    parsed = tomllib.loads(gc.render_config_toml(_SAMPLE_MCP))
+    flow = parsed["mcp_servers"]["roboco-flow"]
+    assert flow["command"] == "uv"
+    assert flow["args"][:2] == ["run", "--no-sync"]
+    # The gateway env (token) reaches the server block — the keystone.
+    assert flow["env"]["ROBOCO_AGENT_TOKEN"] == "tok-123"
+    # A server with no env omits the key entirely.
+    assert "env" not in parsed["mcp_servers"]["roboco-do"]
+
+
+def test_render_config_toml_empty_when_no_servers() -> None:
+    assert gc.render_config_toml({}) == ""
+    assert gc.render_config_toml({"mcpServers": {}}) == ""
+
+
+def test_developer_flags(monkeypatch: pytest.MonkeyPatch) -> None:
+    monkeypatch.delenv("ROBOCO_GROK_REASONING_EFFORT", raising=False)
+    args = gc.grok_cli_args("be-dev-1")
+    dis = _disallowed(args)
+    # Developer writes code + runs a shell → only subagents removed.
+    assert "Agent" in dis
+    assert "run_terminal_cmd" not in dis
+    assert "search_replace" not in dis
+    # Raw git mutation + destructive ops denied even with a shell.
+    assert "--deny" in args
+    assert "Bash(git push*)" in args
+    assert "Bash(rm -rf*)" in args
+    # Code-quality role keeps full reasoning.
+    assert "--effort" not in args
+
+
+def test_pr_reviewer_flags(monkeypatch: pytest.MonkeyPatch) -> None:
+    monkeypatch.delenv("ROBOCO_GROK_REASONING_EFFORT", raising=False)
+    args = gc.grok_cli_args("pr-reviewer-1")
+    dis = _disallowed(args)
+    assert "run_terminal_cmd" in dis  # read-only reviewer: no shell
+    assert "search_replace" in dis  # no editing
+    assert "--deny" not in args  # bash removed → no command rules left
+    assert "--effort" not in args  # code-quality reviewer keeps full reasoning
+
+
+def test_main_pm_keeps_shell_but_denies_git(monkeypatch: pytest.MonkeyPatch) -> None:
+    monkeypatch.delenv("ROBOCO_GROK_REASONING_EFFORT", raising=False)
+    args = gc.grok_cli_args("main-pm")
+    dis = _disallowed(args)
+    assert "run_terminal_cmd" not in dis  # PM keeps a shell
+    assert "search_replace" in dis  # but does not write code
+    assert "Bash(git push*)" in args  # raw git mutation denied
+    assert args[args.index("--effort") + 1] == "low"
+
+
+def test_effort_override(monkeypatch: pytest.MonkeyPatch) -> None:
+    monkeypatch.setenv("ROBOCO_GROK_REASONING_EFFORT", "high")
+    assert (
+        gc.grok_cli_args("be-dev-1")[gc.grok_cli_args("be-dev-1").index("--effort") + 1]
+        == "high"
+    )
+    # "full" disables the per-role reduction entirely.
+    monkeypatch.setenv("ROBOCO_GROK_REASONING_EFFORT", "full")
+    assert "--effort" not in gc.grok_cli_args("main-pm")
+
+
+def test_max_turns_is_emitted() -> None:
+    args = gc.grok_cli_args("be-dev-1", max_turns=7)
+    assert args[args.index("--max-turns") + 1] == "7"