chore: install openagent opencode

Signed-off-by: Dmytro Stanchiev <git@dmytros.dev>

.opencode/context/development/ai/mastra-ai/concepts/agents-tools.md

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+<!-- Context: development/agents-tools | Priority: critical | Version: 1.0 | Updated: 2026-02-15 -->
+
+# Concept: Mastra Agents & Tools
+
+**Purpose**: Reusable units of logic and LLM-powered entities.
+
+**Last Updated**: 2026-01-09
+
+---
+
+## Core Idea
+Agents are specialized LLM configurations that use Tools to interact with external systems or perform specific logic. Tools are the building blocks that provide functionality to both agents and workflows.
+
+## Key Points
+- **Agents**: Defined with a `name`, `instructions`, and `model`. They can be assigned a set of `tools`.
+- **Tools**: Defined with `id`, `inputSchema`, `outputSchema`, and an `execute` function.
+- **Type Safety**: Both agents and tools use Zod for schema validation.
+- **Standalone Use**: Tools can be executed independently of agents, making them highly reusable.
+
+## Quick Example
+```typescript
+// Tool
+const myTool = createTool({
+  id: 'my-tool',
+  inputSchema: z.object({ query: z.string() }),
+  execute: async ({ inputData }) => ({ result: `Processed ${inputData.query}` }),
+});
+
+// Agent
+const myAgent = new Agent({
+  name: 'My Agent',
+  instructions: 'Use my-tool to process queries.',
+  model: { provider: 'OPEN_AI', name: 'gpt-4o' },
+  tools: { myTool },
+});
+```
+
+**Reference**: `src/mastra/agents/`, `src/mastra/tools/`
+**Related**:
+- concepts/core.md
+- concepts/workflows.md