lanes_cacheWrite
Write a cache entry (POST /v1/lanes/cache/write)
This record as markdown: /tools/onesi-genesis-mcp/lanes-cachewrite.md
What lanes_cacheWrite does on Genesis
AI agents use lanes_cacheWrite to create or update resources in Genesis, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Genesis environment.
| Parameter | Type | Required | Description |
|---|---|---|---|
body | object | Yes | |
idempotency_key | string | Yes | Stable key (required); reuse it to replay instead of acting twice |
Parameters from the server's own tool schema.
Why lanes_cacheWrite is rated Medium
An AI agent can call lanes_cacheWrite faster than any human can review: one bad instruction and it creates or modifies resources in Genesis by the hundred, each call as confident as the last.
Risk signalsAccepts raw HTML/template content (body)
Attacks that exploit this kind of access
The rule that runs lanes_cacheWrite safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Genesis, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For lanes_cacheWrite, this is the rule to start with:
lanes_cacheWrite stays usable, but capped: an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect Genesis, apply this rule, and every lanes_cacheWrite call is checked against it from then on.
Questions about lanes_cacheWrite
Write a cache entry (POST /v1/lanes/cache/write). It is categorised as a Write tool in the Genesis MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
lanes_cacheWrite accepts 2 parameters: body, idempotency_key. Required: body, idempotency_key. The full parameter table on this page comes from the server's own tool schema.
Register the Genesis MCP server in PolicyLayer and add a rule for lanes_cacheWrite: 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 Genesis. Nothing to install.
lanes_cacheWrite 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 lanes_cacheWrite 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 lanes_cacheWrite. 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.
lanes_cacheWrite is provided by the Genesis MCP server (@onesi/genesis-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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