Expert Advisor Builder: From a Strategy Specification to an MT5 Test

1. Write the acceptance conditions

Define what should happen before choosing inputs to optimize. For a hypothetical moving-average crossover, specify the symbol, timeframe, completed-bar crossover condition and earliest permitted order time. Describe behavior when a position is already open, after a failed request and after restarting the terminal.

• Separate signal rules from position sizing and exits. Use explicit units for price distances and volume.
• Specify maximum simultaneous positions and treatment of other EAs or manual trades on the same account.
• Describe several expected outcomes: a valid entry, no entry with a failed filter, an exit and a rejected request. These become checks for the implementation.

2. Generate and inspect the source artifact

Select the MQL5 workflow and request an expert advisor implementing the specification. Inspect the code and any assumptions before downloading it. If a requirement is missing, request a precise revision and keep the previous version for comparison. An assistant can accelerate drafting without guaranteeing identical output to a commissioned development project.

3. Compile the MQ5 source in MetaEditor

Place the EA source and any required includes in the appropriate MT5 data-folder project location. Open the main MQ5 file in MetaEditor and use Compile or F7. MetaEditor produces the EX5 executable after successful compilation. Read warnings as well as errors; compilation does not check whether the strategy meets its acceptance conditions.

• The Pineify artifact download contains source text. It does not replace the local MetaEditor compilation step.
• MT4 needs a separate MQL4 workflow and MQ4/EX4 files. Renaming an MQ5 or EX5 file does not port the program.
• If compilation fails, retain the exact diagnostic and source version when requesting a correction.

4. Test behavior, then evaluate the strategy

Use MT5 Strategy Tester to select the EA, symbol, timeframe, date range and inputs. Choose a tick mode appropriate to the logic and record costs, account and execution assumptions. Inspect a small visual run against the expected outcomes before interpreting a larger performance report.

• Freeze the version and inputs before evaluating later data. Parameter search results alone do not demonstrate performance outside the search sample.
• Review equity drawdown, costs, exposure and trade records. There is no universal drawdown threshold that makes an EA acceptable.
• Use MT5 for MQL5 optimization. Pineify Strategy Optimizer is a TradingView product; it does not execute this EA.
• Test a permitted version on a broker demo account to observe ongoing operation and failures. Demo fills and historical fills need not match live fills.

When to involve an MQL developer

Use technical help when you cannot verify order handling, account modes, dependencies or position sizing. A developer can also help turn a large specification into testable parts and investigate behavior that compilation does not catch. Compare scope, deliverables, testing and support terms instead of assuming a standard price or turnaround time.

• Check current Pineify plan and usage terms for the coding workflow; this page does not promise unlimited generation or a fixed cost per EA.
• Agree who maintains source, test cases and broker-specific adaptations. Automatic generation does not remove maintenance.
• For any development method, retain a version history and require evidence for performance claims.