Preview what a wallet's Spectra portfolio would look like after a PT trade. Fetches the wallet's current position (if any) and the PT pool data, computes a trade quote, then shows BEFORE / TRADE / AFTER with deltas. Works even if the wallet has no existing position (simulates a new entry). Side...
Part of the Spectra MCP server. Enforce policies on this tool with Intercept, the open-source MCP proxy.
AI agents call simulate_portfolio_after_trade to retrieve information from Spectra 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 simulate_portfolio_after_trade 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.
tools:
simulate_portfolio_after_trade:
rules:
- action: allowSee the full Spectra policy for all 25 tools.
Agents calling read-class tools like simulate_portfolio_after_trade have been implicated in these attack patterns. Read the full case and prevention policy for each:
Other tools in the Read risk category across the catalogue. The same policy patterns (rate-limit, allow) apply to each.
Preview what a wallet's Spectra portfolio would look like after a PT trade. Fetches the wallet's current position (if any) and the PT pool data, computes a trade quote, then shows BEFORE / TRADE / AFTER with deltas. Works even if the wallet has no existing position (simulates a new entry). Side: "buy" = acquire PT, "sell" = dispose PT. Note: This simulates PT trades only, not YT. YT is acquired by minting (deposit IBT to get PT+YT) and sold via the Router's flash-redeem mechanism, not through the Curve pool directly. The wallet's YT balance is shown but not modified by this simulation. Use get_portfolio to see current full positions. Use quote_trade for a standalone price quote without portfolio context.. It is categorised as a Read tool in the Spectra MCP Server, which means it retrieves data without modifying state.
Add a rule in your Intercept YAML policy under the tools section for simulate_portfolio_after_trade. You can allow, deny, rate-limit, or validate arguments. Then run Intercept as a proxy in front of the Spectra MCP server.
simulate_portfolio_after_trade 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 simulate_portfolio_after_trade rule in your Intercept 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 Intercept policy for simulate_portfolio_after_trade. 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.
simulate_portfolio_after_trade is provided by the Spectra MCP server (spectra-mcp-server). Intercept sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Open source. One binary. Zero dependencies.
npx -y @policylayer/intercept