docs/agent_architecture.md
Previously, Dyad used a pseudo tool-calling strategy using custom XML instead of model's formal tool calling capabilities. Now that models have gotten much better with tool calling, particularly with parallel tool calling, it's beneficial to use a more standard tool calling approach which will also make it much easier to add new tools.
src/pro/main/ipc/handlers/local_agent/local_agent_handler.ts which contains the core agent loop: which keeps calling the LLM until it chooses not to do a tool call or hits the maximum number of steps for the turn.src/pro/main/ipc/handlers/local_agent/tool_definitions.ts contains the list of all the tools available to the Dyad local agent.If you want to add a new tool, you will want to create a new tool in the src/pro/main/ipc/handlers/local_agent/tools directory. You can look at the existing tools as examples.
Then, import the tool and include it in src/pro/main/ipc/handlers/local_agent/tool_definitions.ts
Finally, you will need to define how to render the custom XML tag (e.g. <dyad-$foo-tool-name>) inside src/components/chat/DyadMarkdownParser.tsx which will typically involve creating a new React component to render the custom XML tag.
You can add an E2E test by looking at the existing local agent E2E tests which are named like e2e-tests/local_agent*.spec.ts
You can define a tool call testing fixture at e2e-tests/fixtures/engine which allows you to simulate a tool call.