Securely add a new credential to the vault. Opens a browser form where the user enters their password directly — the password NEVER passes through the AI agent. Supports templates for popular services (github, jira, stripe, etc.).
Part of the Vault MCP server.
Free to start. No card required.
AI agents use vault_add to create or modify resources in Vault MCP. Write operations carry medium risk because an autonomous agent could trigger bulk unintended modifications. Rate limits prevent a single agent session from making hundreds of changes in rapid succession. Argument validation ensures the agent passes expected values.
Without a policy, an AI agent could call vault_add repeatedly, creating or modifying resources faster than any human could review. PolicyLayer's rate limiting ensures write operations happen at a controlled pace, and argument validation catches malformed or unexpected inputs before they reach Vault MCP.
Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.
{
"version": "1",
"default": "deny",
"tools": {
"vault_add": {
"limits": [
{
"counter": "vault_add_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}See the full Vault MCP policy for all 10 tools.
These attack patterns abuse exactly the kind of access vault_add gives an agent. Each links to the full case and the policy that stops it:
Other write tools across the catalogue. The same approach applies to each: rate-limit and validate the arguments.
Securely add a new credential to the vault. Opens a browser form where the user enters their password directly — the password NEVER passes through the AI agent. Supports templates for popular services (github, jira, stripe, etc.).. It is categorised as a Write tool in the Vault MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Vault MCP server in PolicyLayer and add a rule for vault_add: 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 Vault MCP. Nothing to install.
vault_add is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the vault_add 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.
Set action: deny in the PolicyLayer policy for vault_add. 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.
vault_add is provided by the Vault MCP server (chillai-vault-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 10 Vault MCP tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
4,600+ MCP servers and 31,000+ tools scanned and risk-classified.