Generate or adapt AI caption suggestions for one or more social platforms. Uses AI Caption Assist quota and returns options only; it does not create or schedule posts. After the user chooses final copy, pass it to create_post or create_posts_batch.
AI agents call generate_captions to retrieve information from Posterly without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool generates caption suggestions using AI and returns them to the user without any side effects. It explicitly states it does not create or schedule posts, making it a pure read/query operation. The only consumption is AI Caption Assist quota, which is a minor resource usage but not a financial transaction or data modification.
From the tool's definition 'returns options only; it does not create or schedule posts' and 'Generate or adapt AI caption suggestions'
Attacks that exploit this kind of access
Generate or adapt AI caption suggestions for one or more social platforms. Uses AI Caption Assist quota and returns options only; it does not create or schedule posts. After the user chooses final copy, pass it to create_post or create_posts_batch. It is categorised as a Read tool in the Posterly MCP Server, which means it retrieves data without modifying state.
Register the Posterly MCP server in PolicyLayer and add a rule for generate_captions: 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 Posterly. Nothing to install.
generate_captions 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 generate_captions 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 generate_captions. 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.
generate_captions is provided by the Posterly MCP server (posterly-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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