Mastra、コードエージェント作成支援ツール「createCodingAgent」を発表

npm install @mastra/core @mastra/memory

import { buildBasePrompt, createCodingAgent } from "@mastra/core/coding-agent";
import { webSearchTool, webFetchTool, askUserTool } from "@mastra/core/tools";
import { Memory } from "@mastra/memory";

export const codingAgent = createCodingAgent({
  id: "coding-agent",
  name: "Coding Agent",
  instructions: ({ requestContext }) => {
    const mode = (requestContext.get("mode") as string) ?? "build";
    const projectPath = (requestContext.get("projectPath") as string) ?? process.cwd();
    const projectName = (requestContext.get("projectName") as string) ?? "my-app";
    const gitBranch = (requestContext.get("gitBranch") as string) ?? "main";

    return buildBasePrompt({
      mode,
      projectPath,
      projectName,
      gitBranch,
      modelId: "anthropic/claude-sonnet-4.6",
      productName: "Acme Coder",
      coAuthorName: "Acme Bot",
      coAuthorEmail: "bot@acme.dev"
    });
  },
  defaultOptions: {
    maxSteps: 50
  },
  model: "anthropic/claude-sonnet-4.6",
  memory: new Memory(),
  tools: { webSearchTool, webFetchTool, askUserTool }
});

import { createCodingAgent } from "@mastra/core/coding-agent";
import { LocalFilesystem, Workspace } from "@mastra/core/workspace";
import { E2BSandbox } from "@mastra/e2b";

export const codingAgent = createCodingAgent({
  // ...
  workspace: new Workspace({
    filesystem: new LocalFilesystem({ basePath: process.cwd() }),
    sandbox: new E2BSandbox()
  })
});

import { createCodingAgent } from "@mastra/core/coding-agent";
import { WebhookSignalProvider } from "@mastra/core/signals";
import { Memory } from "@mastra/memory";

export const codingAgent = createCodingAgent({
  // ...
  memory: new Memory(),
  signals: [
    new WebhookSignalProvider({
      extractResourceId: (payload) => (payload as { repository: string }).repository
    })
  ]
});

import { createCodingAgent } from "@mastra/core/coding-agent";
import { StreamErrorRetryProcessor } from "@mastra/core/processors";

export const codingAgent = createCodingAgent({
  // ...
  errorProcessors: [
    new StreamErrorRetryProcessor({
      retryUnknownErrors: true,
      maxRetries: 5,
      delayMs: ({ retryCount }) => Math.min(1000 * 2 ** retryCount, 30000)
    })
  ]
});

import { createCodingAgent } from "@mastra/core/coding-agent";

export const codingAgent = createCodingAgent({
  //...
  goal: {
    judge: "anthropic/claude-haiku-4.5",
    maxRuns: 50,
    prompt: "Return `complete` when the code compiles and tests pass."
  }
});