Propose a cache invalidation for review. Filter shape depends on cache type: semantic_cache requires filter_kind=valkey_search + filter_expression; agent_cache requires filter_kind in (tool|key_prefix|session) + filter_value. Warns when estimated_affected exceeds 10000.
Part of the Betterdb server.
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AI agents call cache_propose_invalidate to retrieve information from Betterdb without modifying any data. This is common in research, monitoring, and reporting workflows where the agent needs context before taking action. Because read operations don't change state, they are generally safe to allow without restrictions -- but you may still want rate limits to control API costs.
Even though cache_propose_invalidate only reads data, uncontrolled read access can leak sensitive information or rack up API costs. An agent caught in a retry loop could make thousands of calls per minute. A rate limit gives you a safety net without blocking legitimate use.
Read-only tools are safe to allow by default. No rate limit needed unless you want to control costs.
{
"version": "1",
"default": "deny",
"tools": {
"cache_propose_invalidate": {}
}
}See the full Betterdb policy for all 41 tools.
These attack patterns abuse exactly the kind of access cache_propose_invalidate gives an agent. Each links to the full case and the policy that stops it:
Other read tools across the catalogue. The same approach applies to each: allow, with a rate cap to control cost.
Propose a cache invalidation for review. Filter shape depends on cache type: semantic_cache requires filter_kind=valkey_search + filter_expression; agent_cache requires filter_kind in (tool|key_prefix|session) + filter_value. Warns when estimated_affected exceeds 10000.. It is categorised as a Read tool in the Betterdb MCP Server, which means it retrieves data without modifying state.
Register the Betterdb MCP server in PolicyLayer and add a rule for cache_propose_invalidate: 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 Betterdb. Nothing to install.
cache_propose_invalidate is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the cache_propose_invalidate 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 cache_propose_invalidate. 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.
cache_propose_invalidate is provided by the Betterdb MCP server (@betterdb/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 41 Betterdb 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.