AI agents use watchlist_add to create or update resources in TradingView MCP Bridge — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your TradingView MCP Bridge environment.
This tool modifies persistent user data (the watchlist) by adding a symbol. While it does not delete data (so not Destructive), does not execute arbitrary code (so not Execute), and does not involve financial transactions directly (so not Financial), it does durably change the user's watchlist state.
From the tool's definition Tool name is 'watchlist_add' and description states 'Add a symbol to the TradingView watchlist' — this creates/modifies a list of watched securities in the user's account, a reversible operation with persistent side effects.
Documented attack patterns abuse exactly the kind of access watchlist_add gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and TradingView MCP Bridge, and nothing reaches the server without passing your rules. This is the rule we recommend for watchlist_add:
{
"version": "1",
"default": "deny",
"tools": {
"watchlist_add": {
"limits": [
{
"counter": "watchlist_add_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}watchlist_add 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.
Free to start. No card required.
Add a symbol to the TradingView watchlist. It is categorised as a Write tool in the TradingView MCP Bridge MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the TradingView MCP Bridge MCP server in PolicyLayer and add a rule for watchlist_add: 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 TradingView MCP Bridge. Nothing to install.
watchlist_add 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 watchlist_add 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 watchlist_add. 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.
watchlist_add is provided by the TradingView MCP Bridge MCP server (tradesdontlie/tradingview-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 78 TradingView MCP Bridge tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
78 TradingView MCP Bridge tools catalogued and risk-classified — across an index of 42,500+ MCP servers.