post-queue-cancel
Cancel a scheduled post by event ID. Removes it from the queue.
This record as markdown: /tools/dev-forgesworn-bray/post-queue-cancel.md
What post-queue-cancel does on Nostr Bray
AI agents use post-queue-cancel to create or update resources in Nostr Bray, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Nostr Bray environment.
Why post-queue-cancel is rated Medium
The tool modifies data (removes a post from a queue) but does not permanently delete the underlying post or irreversibly destroy data. The action can be undone by re-scheduling the post. This is a Write operation rather than Destructive because the post itself is not erased, only its queue entry is removed.
From the tool's definition Tool description states 'Cancel a scheduled post by event ID. Removes it from the queue.' — this modifies state by removing a queued post, which is a reversible write operation.
Attacks that exploit this kind of access
The rule that runs post-queue-cancel safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Nostr Bray, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For post-queue-cancel, this is the rule to start with:
post-queue-cancel 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 Nostr Bray, apply this rule, and every post-queue-cancel call is checked against it from then on.
Questions about post-queue-cancel
Cancel a scheduled post by event ID. Removes it from the queue. It is categorised as a Write tool in the Nostr Bray MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Nostr Bray MCP server in PolicyLayer and add a rule for post-queue-cancel: 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 Nostr Bray. Nothing to install.
post-queue-cancel 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 post-queue-cancel 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 post-queue-cancel. 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.
post-queue-cancel is provided by the Nostr Bray MCP server (nostr-bray). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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