Issue a fresh GARL capability token (JWT-shaped + ECDSA-secp256k1 + RFC 6979). Tokens are scoped + time-bound + side-effect-classed. The agent presents the resulting JWT to a tool server; the tool server verifies offline against the GARL key registry.
Part of the Garl Protocol server.
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AI agents use garl_issue_capability_token to create or modify resources in Garl Protocol. 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 garl_issue_capability_token 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 Garl Protocol.
Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.
{
"version": "1",
"default": "deny",
"tools": {
"garl_issue_capability_token": {
"limits": [
{
"counter": "garl_issue_capability_token_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}See the full Garl Protocol policy for all 28 tools.
These attack patterns abuse exactly the kind of access garl_issue_capability_token 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.
Issue a fresh GARL capability token (JWT-shaped + ECDSA-secp256k1 + RFC 6979). Tokens are scoped + time-bound + side-effect-classed. The agent presents the resulting JWT to a tool server; the tool server verifies offline against the GARL key registry.. It is categorised as a Write tool in the Garl Protocol MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Garl Protocol MCP server in PolicyLayer and add a rule for garl_issue_capability_token: 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 Garl Protocol. Nothing to install.
garl_issue_capability_token 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 garl_issue_capability_token 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 garl_issue_capability_token. 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.
garl_issue_capability_token is provided by the Garl Protocol MCP server (@garl-protocol/mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 28 Garl Protocol tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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