stash

THE RISK

Critical Risk

Why stash needs a policy

The tool supports 'drop' and 'clear' operations on stash entries, which irreversibly delete stash data. These operations cannot be undone (git stash drop/clear permanently removes stashed changes). While push/pop/apply are reversible Write/Execute operations, the most severe applicable category due to 'drops' and 'clears' is Destructive.

From the tool's definition drops, clears stash entries

Documented attack patterns abuse exactly the kind of access stash gives an agent:

POLICY

How to control stash

PolicyLayer is an MCP gateway — it sits between your AI agents and Github, and nothing reaches the server without passing your rules. This is the rule we recommend for stash:

policy.json

{
  "version": "1",
  "default": "deny",
  "hide": [
    "stash"
  ]
}

stash disappears from the agent's tool list entirely, and any attempt to call it is denied. The rest of the server keeps working.

Create a free account and register Github — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

RESTRICT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More Github tools

Destructive clean Runs dotnet clean to remove build outputs and returns structured results. Destructive remove Runs Destructive reset Resets the current HEAD to a specified state. Supports soft, mixed, hard, merge, and keep Destructive secret-delete Deletes a repository, organization, or environment GitHub Actions secret. Destructive tag Manages git tags. Supports list (default), create, and delete actions. List returns struct Destructive variable-delete Deletes a repository, organization, or environment GitHub Actions variable. Destructive workspace Manages Terraform workspaces: list, select, create, or delete workspaces. Destructive branch Lists, creates, renames, or deletes branches. Returns structured branch data. Pass

All 202 Github tools →

Destructive tools on other servers

Android Forensics ADB MCP Server create_full_backup 0xarchive web3_revoke_key Frida Game Hacking MCP clear_scan cPanel MCP Server clear_spam_box

Go deeper

Critical-risk tools in Github → Every critical-risk tool this server exposes, in one view.
All critical-risk MCP tools → Every critical-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Blast radius → How much damage one compromised or confused agent can do — and how to bound it.
Tool call approval → Approval gates on individual tool calls: auto-allow, prompt, or deny.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about stash

What does the stash tool do? +

Pushes, pops, applies, drops, shows, or clears stash entries. Returns structured result with action, success, message, and stash reference. It is categorised as a Destructive tool in the Github MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.

How do I enforce a policy on stash? +

Register the Github MCP server in PolicyLayer and add a rule for stash: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Github. Nothing to install.

What risk level is stash? +

stash is a Destructive tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.

Can I rate-limit stash? +

Yes. Add a rate_limit block to the stash rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block stash completely? +

Set action: deny in the PolicyLayer policy for stash. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides stash? +

stash is provided by the Github MCP server (@paretools/github). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Github tool call.

Start from Github, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →