Paper Trading

Run a simulated trading workflow for: $ARGUMENTS

Overview

• Implementation status: code-backed
• Local entry script: <bundle-root>/paper-trading/run.py
• Primary purpose: maintain a local paper book with order simulation, cost basis tracking, cash updates, and basic A-share settlement constraints
• Workflow stage: stage 7 Live Trading & Monitoring in simulated mode
• Local executor guarantee:
  • account inspection when --side is omitted
  • JSON-backed paper-book updates when --side is provided
  • lot-size normalization, commission and stamp-duty handling, cost-basis updates, and T+1 sell-availability checks
• Non-guarantees:
  • no live trading or brokerage integration
  • no automatic slippage, market-impact, concentration, or alert engine beyond what the local ledger actually stores

Use When

• The user wants to validate a trade idea with simulated execution before live trading.
• The user wants to track paper positions with a persistent local ledger.
• The user wants to review cash, positions, and trade history in a simulated account.
• The caller wants a controlled rehearsal surface between analysis and real capital.

Do Not Use When

• The user expects live trading or broker connectivity.
• The user has not yet decided on side, quantity, or thesis and instead needs analysis first.
• The user wants full historical strategy testing. Use backtest-evaluator.
• The user wants advanced portfolio analytics that the local paper ledger does not compute automatically.

Inputs

• One symbol for order mode.
• Optional --side buy|sell; if omitted, the skill returns account status instead of placing an order.
• Optional --quantity, --price, --account, --initial-cash, --trade-date, --note.
• Optional market inputs: --csv, --start, --end, --source for resolving a default price context.
• Operational note:
  • if --price is omitted, the runtime falls back to a current market price context rather than running an execution algorithm
  • the agent should say whether the execution price is user-specified or runtime-defaulted

Execution

Step 1: Decide the mode

• Account status mode: no --side; inspect the current paper book only.
• Trade execution mode: --side is present; attempt a simulated buy or sell and update the paper book.

Step 2: Perform pre-trade checks around the local ledger

Before executing a simulated trade, the agent should review:

• whether the symbol and thesis source are clear
• whether quantity is lot-compatible for the market
• whether there is enough cash for a buy
• whether enough T+1-available shares exist for a sell
• whether the user is asking for a realistic execution rehearsal or only a bookkeeping update

These checks are partly enforced locally and partly should be stated by the agent when the user expects professional workflow discipline.

Step 3: Run the local executor

python3 <bundle-root>/paper-trading/run.py <symbol> --side buy --quantity 100 [--price 18.2]

Step 4: Interpret the result with realism disclosures

The local paper ledger handles cash, cost basis, lots, commission, stamp duty, and T+1 sell constraints. If the user expects richer execution realism, the agent should additionally state:

• whether slippage was explicitly modeled or not
• whether price-limit, suspension, or liquidity risk was checked outside the ledger
• whether concentration or portfolio risk checks were performed manually or remain unmodeled

Step 5: Link the paper trade back to the research loop

After execution or account review, the agent should identify:

• which thesis or plan the position belongs to
• what invalidation or monitoring conditions should be checked next
• whether session-status, reports, analysis-history, or backtest-evaluator should be used for follow-up

Output Contract

• Account mode: readable text beginning with # Paper Account <account>.
• Trade mode: readable text beginning with # Paper Trade <trade_id>, followed by account state after the trade.
• Side effects: writes a JSON paper ledger under the runtime area and appends paper-trade history.
• Local executor guarantee:
  • ledger persistence
  • cost-basis and lot tracking
  • commission and stamp-duty modeling
  • T+1 sell-availability enforcement
• Agent-required delivery standard:
  • always state This is simulated trading only; no real capital is at risk.
  • identify whether the price was user-specified or runtime-defaulted
  • identify what realism layers were not modeled locally, especially slippage, market impact, ADV capacity, price-limit fillability, suspension risk, and portfolio-level concentration
  • if presenting performance or risk interpretation beyond cash and positions, label the assumptions and calculation basis explicitly

Failure Handling

• Parse and argument errors: non-zero exit with a readable 命令错误 message.
• Invalid lot-normalized quantity: readable 执行失败: text with the lot-size requirement.
• Insufficient cash: readable 执行失败: text.
• Insufficient available shares for sell: readable 执行失败: text with the available T+1-adjusted quantity.
• The skill never places live orders; all changes stay local to the paper ledger.

Key Rules

• Treat every result as simulated only.
• Be honest about what the local ledger models versus what the agent is layering on top.
• Respect A-share constraints such as lot sizes, T+1 sell availability, and sell-side stamp duty.
• Use this skill to validate process discipline before real execution, not to mimic a broker.

Composition

• Commonly follows analysis, decision-support, or strategy-design.
• Pairs with session-status for runtime context and with reports or analysis-history for artifact-linked review.
• Serves as the simulated live-verification layer before any real-capital workflow outside the bundle.