Add or update a vendor on the buyer's roster. Use to set a vendor as primary, backup, or excluded - optionally scoped to a single service category. Examples: 'mark Capitol Reporters as primary for court reporting,' 'add MES Solutions to my IME roster as backup,' 'exclude this vendor entirely.' Re...
Part of the Scope (AEC) - Preview server.
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AI agents use scope_set_vendor_tier to create or modify resources in Scope (AEC) - Preview. 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 scope_set_vendor_tier 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 Scope (AEC) - Preview.
Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.
{
"version": "1",
"default": "deny",
"tools": {
"scope_set_vendor_tier": {
"limits": [
{
"counter": "scope_set_vendor_tier_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}See the full Scope (AEC) - Preview policy for all 30 tools.
These attack patterns abuse exactly the kind of access scope_set_vendor_tier 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.
Add or update a vendor on the buyer's roster. Use to set a vendor as primary, backup, or excluded - optionally scoped to a single service category. Examples: 'mark Capitol Reporters as primary for court reporting,' 'add MES Solutions to my IME roster as backup,' 'exclude this vendor entirely.' Requires authentication.. It is categorised as a Write tool in the Scope (AEC) - Preview MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Scope (AEC) - Preview MCP server in PolicyLayer and add a rule for scope_set_vendor_tier: 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 Scope (AEC) - Preview. Nothing to install.
scope_set_vendor_tier 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 scope_set_vendor_tier 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 scope_set_vendor_tier. 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.
scope_set_vendor_tier is provided by the Scope (AEC) - Preview MCP server (scope-bid/scope-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 30 Scope (AEC) - Preview tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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