agent
217 lines
7.1 KiB
Go
217 lines
7.1 KiB
Go
package main
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import (
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"context"
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"fmt"
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"os/exec"
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"path/filepath"
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"strings"
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"github.com/mark3labs/mcp-go/mcp"
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"github.com/mark3labs/mcp-go/server"
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"fn-registry/functions/browser"
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)
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const htmlMax = 200_000
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// registerReadTools wires page_get_html, page_get_text, page_perceive,
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// page_eval_js (MUTA), page_screenshot.
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func registerReadTools(s *server.MCPServer, d *deps) {
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s.AddTool(pageGetHTMLTool(), mcp.NewTypedToolHandler(d.handlePageGetHTML))
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s.AddTool(pageGetTextTool(), mcp.NewTypedToolHandler(d.handlePageGetText))
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s.AddTool(pagePerceiveTool(), mcp.NewTypedToolHandler(d.handlePagePerceive))
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s.AddTool(pageScreenshotTool(), mcp.NewTypedToolHandler(d.handlePageScreenshot))
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if !d.readOnly {
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s.AddTool(pageEvalJSTool(), mcp.NewTypedToolHandler(d.handlePageEvalJS))
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}
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}
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// ---- page_get_text ----
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type pageGetTextArgs struct {
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Port int `json:"port"`
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Selector string `json:"selector"`
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MaxBytes int `json:"max_bytes"`
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}
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func pageGetTextTool() mcp.Tool {
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return mcp.NewTool("page_get_text",
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mcp.WithDescription("Devuelve el texto visible (innerText) de la página o de un elemento (selector CSS), truncado a max_bytes. Preferir sobre page_get_html cuando solo necesitas leer contenido — no revienta el contexto."),
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mcp.WithNumber("port", mcp.Description("CDP port. Default 9333 (Chrome isolated del MCP); usa 9222 explícito solo para adjuntarte al navegador diario.")),
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mcp.WithString("selector", mcp.Description("Selector CSS opcional. Vacío = body (toda la página).")),
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mcp.WithNumber("max_bytes", mcp.Description("Máximo de bytes a devolver. Default 20000. 0 = sin límite.")),
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)
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}
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func (d *deps) handlePageGetText(_ context.Context, _ mcp.CallToolRequest, a pageGetTextArgs) (*mcp.CallToolResult, error) {
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maxBytes := a.MaxBytes
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if maxBytes == 0 {
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maxBytes = 20000
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}
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var text string
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err := d.withConn(portOr(a.Port), func(c *browser.CDPConn) error {
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var e error
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text, e = browser.CdpGetText(c, a.Selector, maxBytes)
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return e
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})
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if err != nil {
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return mcp.NewToolResultError(err.Error()), nil
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}
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return mcp.NewToolResultText(text), nil
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}
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// ---- page_perceive ----
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type pagePerceiveArgs struct {
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Port int `json:"port"`
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TabID string `json:"tab_id"`
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MaxChars int `json:"max_chars"`
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}
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func pagePerceiveTool() mcp.Tool {
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return mcp.NewTool("page_perceive",
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mcp.WithDescription("Devuelve un outline indentado y accionable del árbol de accesibilidad (roles, nombres, #ref) — la forma compacta de que el agente 'perciba' la página sin reventar el contexto. Si tab_id se omite, usa la primera pestaña page. Gotcha: requiere el binario `fn` y el venv de Python del registry disponibles en runtime."),
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mcp.WithNumber("port", mcp.Description("CDP port. Default 9333 (Chrome isolated del MCP); usa 9222 explícito solo para adjuntarte al navegador diario.")),
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mcp.WithString("tab_id", mcp.Description("Target id de la pestaña. Vacío = primera pestaña page.")),
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mcp.WithNumber("max_chars", mcp.Description("Máximo de chars del outline. Default 20000.")),
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)
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}
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func (d *deps) handlePagePerceive(_ context.Context, _ mcp.CallToolRequest, a pagePerceiveArgs) (*mcp.CallToolResult, error) {
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port := portOr(a.Port)
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maxChars := a.MaxChars
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if maxChars == 0 {
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maxChars = 20000
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}
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root, err := resolveRoot()
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if err != nil {
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return mcp.NewToolResultError("resolve registry root: " + err.Error()), nil
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}
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tabID := a.TabID
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if tabID == "" {
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tabs, err := browser.CdpListTabs("localhost", port)
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if err != nil {
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return mcp.NewToolResultError("list tabs: " + err.Error()), nil
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}
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for _, t := range tabs {
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if t.Type == "page" {
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tabID = t.ID
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break
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}
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}
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if tabID == "" {
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return mcp.NewToolResultError("no 'page' tab found on port " + fmt.Sprint(port)), nil
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}
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}
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cmd := exec.Command(filepath.Join(root, "fn"), "run", "cdp_perceive_outline",
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"--debug-port", fmt.Sprint(port),
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"--tab-id", tabID,
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"--max-chars", fmt.Sprint(maxChars),
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)
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cmd.Dir = root
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var stdout, stderr strings.Builder
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cmd.Stdout = &stdout
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cmd.Stderr = &stderr
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if err := cmd.Run(); err != nil {
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msg := strings.TrimSpace(stderr.String())
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if msg == "" {
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msg = err.Error()
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}
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return mcp.NewToolResultError("cdp_perceive_outline failed: " + msg), nil
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}
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return mcp.NewToolResultText(truncate(stdout.String(), htmlMax)), nil
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}
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// ---- page_get_html ----
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type pageGetHTMLArgs struct {
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Port int `json:"port"`
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}
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func pageGetHTMLTool() mcp.Tool {
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return mcp.NewTool("page_get_html",
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mcp.WithDescription("Return the current page's full serialized HTML (outerHTML). Truncated to 200000 chars."),
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mcp.WithNumber("port", mcp.Description("CDP port. Default 9222.")),
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)
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}
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func (d *deps) handlePageGetHTML(_ context.Context, _ mcp.CallToolRequest, a pageGetHTMLArgs) (*mcp.CallToolResult, error) {
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var html string
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err := d.withConn(portOr(a.Port), func(c *browser.CDPConn) error {
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var e error
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html, e = browser.CdpGetHTML(c)
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return e
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})
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if err != nil {
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return mcp.NewToolResultError(err.Error()), nil
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}
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return mcp.NewToolResultText(truncate(html, htmlMax)), nil
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}
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// ---- page_eval_js (MUTA) ----
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type pageEvalJSArgs struct {
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Port int `json:"port"`
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Expression string `json:"expression"`
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}
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func pageEvalJSTool() mcp.Tool {
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return mcp.NewTool("page_eval_js",
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mcp.WithDescription("Evaluate a JavaScript expression in the page context via Runtime.evaluate. Returns the stringified result."),
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mcp.WithNumber("port", mcp.Description("CDP port. Default 9222.")),
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mcp.WithString("expression", mcp.Required(), mcp.Description("JavaScript expression to evaluate.")),
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)
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}
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func (d *deps) handlePageEvalJS(_ context.Context, _ mcp.CallToolRequest, a pageEvalJSArgs) (*mcp.CallToolResult, error) {
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if a.Expression == "" {
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return mcp.NewToolResultError("expression is required"), nil
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}
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var res string
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err := d.withConn(portOr(a.Port), func(c *browser.CDPConn) error {
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var e error
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res, e = browser.CdpEvaluate(c, a.Expression)
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return e
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})
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if err != nil {
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return mcp.NewToolResultError(err.Error()), nil
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}
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return mcp.NewToolResultText(truncate(res, htmlMax)), nil
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}
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// ---- page_screenshot ----
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type pageScreenshotArgs struct {
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Port int `json:"port"`
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Path string `json:"path"`
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FullPage bool `json:"full_page"`
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}
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func pageScreenshotTool() mcp.Tool {
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return mcp.NewTool("page_screenshot",
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mcp.WithDescription("Capture a screenshot of the current page and write it to a local path (.png/.jpg)."),
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mcp.WithNumber("port", mcp.Description("CDP port. Default 9222.")),
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mcp.WithString("path", mcp.Required(), mcp.Description("Output file path (.png or .jpg).")),
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mcp.WithBoolean("full_page", mcp.Description("Capture the full scroll height instead of just the viewport.")),
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)
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}
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func (d *deps) handlePageScreenshot(_ context.Context, _ mcp.CallToolRequest, a pageScreenshotArgs) (*mcp.CallToolResult, error) {
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if a.Path == "" {
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return mcp.NewToolResultError("path is required"), nil
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}
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opts := browser.CdpScreenshotOpts{FullPage: a.FullPage}
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err := d.withConn(portOr(a.Port), func(c *browser.CDPConn) error {
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return browser.CdpScreenshot(c, a.Path, opts)
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})
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if err != nil {
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return mcp.NewToolResultError(err.Error()), nil
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}
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return mcp.NewToolResultText("screenshot saved to " + a.Path), nil
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}
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