Capture a market signal — a post, article, quote, screenshot, or discussion. IMPORTANT: Always include source_name, source_handle, source_url, platform, and published_at when known. These are critical for proper attribution and tracking.
Part of the Vantage — Signal Tracker server.
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AI agents call capture_signal to retrieve information from Vantage — Signal Tracker 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 capture_signal 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": {
"capture_signal": {}
}
}See the full Vantage — Signal Tracker policy for all 13 tools.
These attack patterns abuse exactly the kind of access capture_signal 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.
Capture a market signal — a post, article, quote, screenshot, or discussion. IMPORTANT: Always include source_name, source_handle, source_url, platform, and published_at when known. These are critical for proper attribution and tracking.. It is categorised as a Read tool in the Vantage — Signal Tracker MCP Server, which means it retrieves data without modifying state.
Register the Vantage — Signal Tracker MCP server in PolicyLayer and add a rule for capture_signal: 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 Vantage — Signal Tracker. Nothing to install.
capture_signal 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 capture_signal 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 capture_signal. 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.
capture_signal is provided by the Vantage — Signal Tracker MCP server (Cavendo-AI/vantage). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 13 Vantage — Signal Tracker tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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