{"id":50451391,"url":"https://github.com/xusenlin/go-agent","last_synced_at":"2026-06-01T00:03:19.286Z","repository":{"id":353261459,"uuid":"1216875365","full_name":"xusenlin/go-agent","owner":"xusenlin","description":null,"archived":false,"fork":false,"pushed_at":"2026-04-23T05:08:18.000Z","size":60,"stargazers_count":0,"open_issues_count":0,"forks_count":0,"subscribers_count":0,"default_branch":"main","last_synced_at":"2026-04-23T07:10:29.043Z","etag":null,"topics":[],"latest_commit_sha":null,"homepage":null,"language":"Go","has_issues":true,"has_wiki":null,"has_pages":null,"mirror_url":null,"source_name":null,"license":"mit","status":null,"scm":"git","pull_requests_enabled":true,"icon_url":"https://github.com/xusenlin.png","metadata":{"files":{"readme":"README.md","changelog":null,"contributing":null,"funding":null,"license":"LICENSE","code_of_conduct":null,"threat_model":null,"audit":null,"citation":null,"codeowners":null,"security":null,"support":null,"governance":null,"roadmap":null,"authors":null,"dei":null,"publiccode":null,"codemeta":null,"zenodo":null,"notice":null,"maintainers":null,"copyright":null,"agents":"AGENTS.md","dco":null,"cla":null}},"created_at":"2026-04-21T10:14:38.000Z","updated_at":"2026-04-23T05:08:21.000Z","dependencies_parsed_at":null,"dependency_job_id":null,"html_url":"https://github.com/xusenlin/go-agent","commit_stats":null,"previous_names":["xusenlin/go-agent"],"tags_count":null,"template":false,"template_full_name":null,"purl":"pkg:github/xusenlin/go-agent","repository_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/xusenlin%2Fgo-agent","tags_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/xusenlin%2Fgo-agent/tags","releases_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/xusenlin%2Fgo-agent/releases","manifests_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/xusenlin%2Fgo-agent/manifests","owner_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners/xusenlin","download_url":"https://codeload.github.com/xusenlin/go-agent/tar.gz/refs/heads/main","sbom_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/xusenlin%2Fgo-agent/sbom","scorecard":null,"host":{"name":"GitHub","url":"https://github.com","kind":"github","repositories_count":286080680,"owners_count":33753931,"icon_url":"https://github.com/github.png","version":null,"created_at":"2022-05-30T11:31:42.601Z","updated_at":"2026-05-26T15:22:16.424Z","status":"online","status_checked_at":"2026-05-31T02:00:06.040Z","response_time":95,"last_error":null,"robots_txt_status":"success","robots_txt_updated_at":"2025-07-24T06:49:26.215Z","robots_txt_url":"https://github.com/robots.txt","online":true,"can_crawl_api":true,"host_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub","repositories_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories","repository_names_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repository_names","owners_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners"}},"keywords":[],"created_at":"2026-06-01T00:03:18.555Z","updated_at":"2026-06-01T00:03:19.272Z","avatar_url":"https://github.com/xusenlin.png","language":"Go","funding_links":[],"categories":[],"sub_categories":[],"readme":"# go-agent\n\n[![CI](https://github.com/xusenlin/go-agent/actions/workflows/ci.yml/badge.svg)](https://github.com/xusenlin/go-agent/actions/workflows/ci.yml)\n[![Go Reference](https://pkg.go.dev/badge/github.com/xusenlin/go-agent.svg)](https://pkg.go.dev/github.com/xusenlin/go-agent)\n[![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](./LICENSE)\n\nA clean, extensible ReAct agent in Go with streaming LLM support, a composable\nhook system, Skill bundles, and MCP (Model Context Protocol) integration.\n\n## Features\n\n| Capability | Details |\n|---|---|\n| **Providers** | Anthropic, Google Gemini, OpenAI-compatible (DeepSeek, Moonshot…) |\n| **Hook system** | Chainable middleware via `.Use()` — intercept \u0026 mutate tool I/O |\n| **Streaming** | LLM responses streamed internally; hooks see the full assembled response |\n| **Skills** | Bundle tools + system-prompt fragments into reusable packages |\n| **MCP** | Auto-discover tools from any MCP server (Stdio or SSE transport) |\n| **Proxy** | Single `WithProxy()` call covers HTTP clients *and* child-process env vars |\n\n---\n\n## Quick start\n\n```bash\ngo get github.com/xusenlin/go-agent\n```\n\n```go\npackage main\n\nimport (\n    \"context\"\n    \"fmt\"\n    \"log/slog\"\n    \"os\"\n\n    \"github.com/xusenlin/go-agent/agent\"\n    \"github.com/xusenlin/go-agent/hook/builtin\"\n    anthropicprovider \"github.com/xusenlin/go-agent/provider/anthropic\"\n    \"github.com/xusenlin/go-agent/tool/plan\"\n)\n\nfunc main() {\n    a, _ := agent.New().\n        WithProvider(anthropicprovider.New(os.Getenv(\"ANTHROPIC_API_KEY\"), nil)).\n        WithModel(\"claude-opus-4-7\").  // unified setter — works for any provider\n        WithTools(plan.New()).\n        WithMaxIter(10).\n        Use(builtin.NewLogger(slog.Default())).\n        Build()\n\n    result, _ := a.Run(context.Background(), \"Analyse the pros and cons of Go generics.\")\n    fmt.Println(result.Output)\n}\n```\n\n### Default models per provider\n\n| Provider | Default | Change with |\n|---|---|---|\n| Anthropic | `claude-opus-4-7` | `.WithModel(\"claude-sonnet-4-6\")` |\n| Gemini | `gemini-2.0-flash` | `.WithModel(\"gemini-2.5-pro\")` |\n| OpenAI | `gpt-4o` | `.WithModel(\"deepseek-chat\")` |\n\n---\n\n## Architecture\n\n```\nagent.New()  (Builder)\n    │\n    ├── WithProvider(p)        → provider.Provider\n    │                            ├── anthropic  (official SDK)\n    │                            ├── gemini     (official SDK)\n    │                            └── openai     (hand-rolled, zero deps)\n    │\n    ├── WithTools(t...)        → tool.Registry\n    │                            ├── Native tools (implement tool.Tool)\n    │                            └── MCP tools   (auto-wrapped)\n    │\n    ├── WithSkill(s)           → skill.Skill\n    │                            └── Tools() + SystemPrompt() merged in\n    │\n    ├── WithMCP(\"npx ...\")     → mcp.Client (Stdio or SSE, auto-detected)\n    │\n    ├── WithProxy(cfg)         → provider.ProxyConfig\n    │                            ├── http.Client for all HTTP calls\n    │                            └── os.Environ() inject for child procs\n    │\n    └── Use(hook...)           → hook.Chain\n                                 ├── OnAgentStart\n                                 ├── OnThinkStart / OnThinkEnd\n                                 ├── OnToolStart  ← can mutate input\n                                 ├── OnToolEnd    ← can mutate output\n                                 ├── OnPlanCreated\n                                 ├── OnAgentFinish\n                                 └── OnAgentError\n```\n\n---\n\n## Writing a custom hook\n\nEmbed `hook.BaseHook` and override only what you need:\n\n```go\ntype MyHook struct{ hook.BaseHook }\n\n// Intercept tool input before execution\nfunc (h *MyHook) OnToolStart(ctx context.Context, e *hook.ToolStartEvent) error {\n    fmt.Println(\"about to call:\", e.ToolName)\n    return nil\n}\n\n// Mutate tool output before it goes back to the LLM\nfunc (h *MyHook) OnToolEnd(ctx context.Context, e *hook.ToolEndEvent) error {\n    e.Output = \"[sanitised] \" + e.Output\n    return nil\n}\n\n// React to a plan being created (e.g. render UI)\nfunc (h *MyHook) OnPlanCreated(ctx context.Context, e *hook.PlanCreatedEvent) error {\n    for i, step := range e.Steps {\n        fmt.Printf(\"%d. %s\\n\", i+1, step.Title)\n    }\n    return nil\n}\n```\n\nRegister it with:\n\n```go\nagent.New().Use(\u0026MyHook{})...\n```\n\n---\n\n## Writing a custom tool\n\n```go\ntype MyTool struct{}\n\nfunc (t *MyTool) Name() string        { return \"my_tool\" }\nfunc (t *MyTool) Description() string { return \"Does something useful.\" }\nfunc (t *MyTool) InputSchema() json.RawMessage {\n    return tool.NewSchema().\n        String(\"query\", \"What to look up\", true).\n        Build()\n}\nfunc (t *MyTool) Run(ctx context.Context, raw json.RawMessage) (string, error) {\n    var in struct{ Query string `json:\"query\"` }\n    json.Unmarshal(raw, \u0026in)\n    return \"result for: \" + in.Query, nil\n}\n```\n\n---\n\n## MCP integration\n\n```go\n// Stdio (local process — auto-detected from non-URL spec)\nagent.New().WithMCP(\"npx -y @modelcontextprotocol/server-filesystem /tmp\")\n\n// SSE (remote server — auto-detected from http/https prefix)\nagent.New().WithMCP(\"https://my-mcp-server.example.com\")\n\n// With proxy (env vars are injected into the child process automatically)\nagent.New().\n    WithProxy(provider.ProxyConfig{HTTPSProxy: \"http://127.0.0.1:7890\"}).\n    WithMCP(\"npx -y @modelcontextprotocol/server-brave-search\")\n```\n\n---\n\n## Running the examples\n\n```bash\n# Plan demo (Anthropic)\nANTHROPIC_API_KEY=sk-... go run ./examples/plan\n\n# MCP filesystem demo (OpenAI-compatible / DeepSeek)\nOPENAI_API_KEY=sk-... \\\nOPENAI_BASE_URL=https://api.deepseek.com/v1 \\\ngo run ./examples/mcp_demo\n```\n\n---\n\n## Dependency setup\n\n```bash\ngo mod tidy\n# or individually:\ngo get github.com/anthropics/anthropic-sdk-go\ngo get google.golang.org/genai\n```\n\n---\n\n## License\n\nMIT © xusenlin. See [LICENSE](./LICENSE).\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fxusenlin%2Fgo-agent","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fxusenlin%2Fgo-agent","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fxusenlin%2Fgo-agent/lists"}