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Evaluate Agent Control

With an MCP client already connected to a TradeScript browser session, four things are worth evaluating before granting any real authority: product behavior, access policy, recovery, and visible evidence. None of them require live trading permission.

TradeScript agent console beside a chart with approved controls and activity evidence
The evaluation succeeds when the approved controls, controller results, events, and visible chart all agree.

Before you start​

  • Complete Connect an MCP Client.
  • Mount the chart and any surfaces you want to evaluate before attaching the session.
  • Start with read: true, the minimum required write families, and trade: false.
  • Use a paper broker if the evaluation includes order actions.
  • Decide who may approve a trade and where the resulting operation evidence is stored.

1. Prove session and target discovery​

  1. Read tradescript://sessions.
  2. Call tradescript_get_context for the session target.
  3. Select one exact chart or widget target returned by context.
  4. Call tradescript_list_controls for that target.

Pass: the selected browser session, mounted targets, and effective controls match the application and the attachment policy. No other session appears.

2. Run a read-only inspection​

Ask the agent to explain the active symbol, interval, loaded range, indicators, drawings, and relevant market context without changing anything.

Pass: the response is supported by controller context and, where pixels matter, a snapshot of the same target. Missing data is reported as unavailable rather than invented.

3. Run a reversible chart task​

Allow only the chart families required for this task, then ask the agent to:

  1. Switch to a specified symbol and interval.
  2. Add two built-in indicators.
  3. Create and style one drawing.
  4. Save a new layout without overwriting an existing one.
  5. Verify the final chart image.

Pass: every call uses a control returned for the selected target, current revisions are carried into mutations, and the final controller state and image match the objective.

4. Test conflict recovery​

Change the chart from the human interface after the agent reads context but before it submits a mutation.

Pass: the stale mutation is rejected by revision checks. The agent rereads context, reassesses the objective, and sends a new operation only if the action is still correct.

5. Evaluate paper trading separately​

Create a new attachment whose policy explicitly allows only the required paper trade controls. Never reuse a chart-write grant as trade authority.

Ask the agent to inspect account, market, ticket, broker capability, and risk state; preview one bounded order; place it only after the required approval; then close or cancel it and prove the final state.

Pass: the broker declares a paper environment, the host risk policy permits the exact action, the call carries an operation ID, and order, execution, position, cash, and buying-power evidence reconcile. No trade control is effective when the paper grant is absent.

6. Revoke and verify cleanup​

Detach the browser session and stop the local MCP process.

Pass: the old session disappears from tradescript://sessions, its targets cannot be called, and no event subscription remains active.

Evidence to retain​

  • evaluation objective and approved access policy
  • session and target identities
  • effective control list
  • exact calls, results, revisions, and operation IDs
  • risk and approval evidence for financial actions
  • before/after context, relevant events, and before/after images
  • revocation result

The activity feed is immediate run evidence. Persist it in your own audited system when your governance policy requires durable retention.

Next steps​