AI agent platforms and coding workflows #108

Today's Letter

1. GitHub, Agent Plugins 1.0 generally available
2. OpenAI, Codex available in ChatGPT
3. DeepSeek Adds Responses API Support
4. Plannotator, local review UI for coding agents

GitHub, Agent Plugins 1.0 generally available

• Agent Plugins 1.0 packages agent skills and MCP servers into one portable, installable plugin
• Support is generally available in VS Code, Copilot CLI, GitHub Copilot SDK, and the GitHub Copilot app across all Copilot plans
• Compatible clients can discover supported skills and MCP configuration from the same package
• Plugins are listed in the Awesome Copilot marketplace, available by default in supported clients
• Existing GitHub Copilot plugins remain supported without migration
• Business and Enterprise administrators can manage installation through enabledPlugins, extraKnownMarketplaces, and strictKnownMarketplaces
• MCP server allowlists can restrict plugin-provided server configurations by URL, command, or name

Source: github.blog

OpenAI, Codex available in ChatGPT

• OpenAI made Codex available in the ChatGPT app
• Codex handles pull requests, feature work, refactoring, migrations, and other end-to-end engineering tasks
• Built-in worktrees and cloud environments support parallel agent workflows across projects
• Skills let teams define coding standards, workflows, and operating procedures for repeated use
• Scheduled runs can handle issue triage, alert monitoring, and CI/CD tasks in the background
• Codex is connected across ChatGPT, editor integrations, and the terminal through the same ChatGPT account
• OpenAI cites a 30–50% reduction in early iteration time at Harvey, according to an included customer statement

Source: openai.com
More: community.openai.com

DeepSeek Adds Responses API Support

• DeepSeek API now supports the OpenAI Responses API format for Codex integrations
• Supported models include deepseek-v4-flash and deepseek-v4-pro
• Streaming uses semantic server-sent events and ends with response.completed, response.incomplete, or response.failed
• Function calling and server-side web search are supported; other tool types are ignored
• The API is stateless: previous_response_id, conversation, store, and background requests are unsupported
• Requests exceeding the context window return HTTP 400
• Token usage includes input, cached, output, and reasoning token counts

Source: api-docs.deepseek.com
More: openrouter.ai

Plannotator, local review UI for coding agents

• Plannotator provides a browser-based local review surface for AI coding agents
• Plans, specifications, agent messages, Markdown, HTML artifacts, code diffs, and pull requests can be annotated
• Comments and review feedback are sent back to the agent through hooks and commands
• Code review supports Git, GitButler, Jujutsu, Perforce, GitHub, and GitLab workflows
• Built-in AI can answer questions about reviewed content or post review comments to diffs
• Plans, diffs, annotations, drafts, history, and configuration remain local by default, with no usage telemetry or analytics

Source: github.com
More: zed.dev

Jocoletter curates AI, software, and product trends for developers and builders.

#DeepSeek #GitHub #OpenAI #Plannotator

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