Give the root tools to start and message children

[onechat] / agent.go

diff --git a/agent.go b/agent.go
index 1be2b0a136f54dbfa55573ce4b37e572f9798191..9a85426382c900f69e9b6d1aaf4493d2fe9d71d3 100644 (file)
--- a/agent.go
+++ b/agent.go
@@ -10,7 +10,10 @@ import (
        "io"
        "os"
        "path/filepath"
        "io"
        "os"
        "path/filepath"

+       "slices"

        "strings"
        "strings"

+
+       "golang.org/x/sys/unix"

 )
 
 const (
 )
 
 const (


@@ -50,6 +53,7 @@ func openAgent(dir string) (*Agent, error) {
 
        decoder := json.NewDecoder(bytes.NewReader(data))
        decoder.DisallowUnknownFields()
 
        decoder := json.NewDecoder(bytes.NewReader(data))
        decoder.DisallowUnknownFields()

+

        err = decoder.Decode(&config)
        if err == nil && !errors.Is(decoder.Decode(&struct{}{}), io.EOF) {
                err = errors.New("data after the JSON object")
        err = decoder.Decode(&config)
        if err == nil && !errors.Is(decoder.Decode(&struct{}{}), io.EOF) {
                err = errors.New("data after the JSON object")


@@ -87,10 +91,166 @@ func (a *Agent) CacheKey() string {
 func (a *Agent) Prompt() (string, error) {
        instructions, err := a.instructions()
        if err != nil {
 func (a *Agent) Prompt() (string, error) {
        instructions, err := a.instructions()
        if err != nil {

-               return "", err
+               return "", fmt.Errorf("read prompt instructions: %w", err)
+       }
+
+       path, err := filepath.Abs(filepath.Join(a.dir, agentInstructionsFileName))
+       if err != nil {
+               return "", fmt.Errorf("find instructions path: %w", err)
+       }
+
+       if a.config.Parent != "" {
+               return promptChild(a.config.Name, a.config.Parent, a.config.Responsibility, path, instructions), nil
+       }
+
+       return prompt(a.config.Name, path, instructions), nil
+}
+
+// Tools returns the tools shared by the turns and compactions of this agent. A
+// child has neither WhatsApp tools nor child creation.
+func (a *Agent) Tools() []ModelTool {
+       tools := promptTools()
+       if a.config.Parent != "" {
+               tools = slices.DeleteFunc(tools, func(tool ModelTool) bool {
+                       return strings.HasPrefix(tool.Name, "whatsapp_") || tool.Name == "agent_create"
+               })
+       }
+
+       return tools
+}
+
+// Children reads the direct children in directory order. Each child needs an
+// existing config with its directory name and this agent as parent. Children
+// cannot have children. A missing children directory means no children.
+func (a *Agent) Children() ([]*Agent, error) {
+       dir := filepath.Join(a.dir, "children")
+       entries, err := os.ReadDir(dir)
+       if errors.Is(err, os.ErrNotExist) {
+               return nil, nil
+       }
+
+       if err != nil {
+               return nil, fmt.Errorf("read children: %w", err)
+       }
+
+       if a.config.Parent != "" && len(entries) != 0 {
+               return nil, errors.New("children cannot have children")
+       }
+
+       var children []*Agent
+
+       keys := map[string]bool{a.CacheKey(): true}
+
+       for _, entry := range entries {
+               name := entry.Name()
+               if !entry.IsDir() {
+                       return nil, fmt.Errorf("child %q must be a directory", name)
+               }
+
+               path := filepath.Join(dir, name)
+               _, err = os.Stat(filepath.Join(path, "config.json"))
+               if err != nil {
+                       return nil, fmt.Errorf("child %q config: %w", name, err)
+               }
+
+               child, err := openAgent(path)
+               if err != nil {
+                       return nil, fmt.Errorf("open child %q: %w", name, err)
+               }
+
+               if child.config.Name != name || child.config.Parent != a.config.Name {
+                       return nil, fmt.Errorf("child %q needs name %q and parent %q", name, name, a.config.Name)
+               }
+
+               if child.config.Name == a.config.Name || keys[child.CacheKey()] {
+                       return nil, fmt.Errorf("child %q must have its own name and ID", name)
+               }
+
+               keys[child.CacheKey()] = true
+               _, err = child.Children()
+               if err != nil {
+                       return nil, fmt.Errorf("read child %q: %w", name, err)
+               }
+
+               children = append(children, child)

        }
 
        }
 

-       return prompt(a.config.Name, instructions), nil
+       return children, nil
+}
+
+// CreateChild writes a new direct child with its own ID and the model, effort,
+// and working directory of the root. Child and subagent names share a
+// namespace. The config is complete before an atomic rename publishes the
+// child. Preparation stays outside children, so an interrupted write cannot
+// stop startup.
+func (a *Agent) CreateChild(name, responsibility string, subagents *Subagents) (_ *Agent, err error) {
+       if a.config.Parent != "" {
+               return nil, errors.New("only the root can create children")
+       }
+
+       if !agentChildNameValid(name) {
+               return nil, errors.New("name must have 2 to 32 ASCII letters and start with a capital letter")
+       }
+
+       if name == a.config.Name {
+               return nil, errors.New("the name is already used by the root")
+       }
+
+       responsibility = strings.TrimSpace(responsibility)
+       if responsibility == "" {
+               return nil, errors.New("responsibility must not be empty")
+       }
+
+       err = subagents.Reserve(name)
+       if err != nil {
+               return nil, fmt.Errorf("reserve child name: %w", err)
+       }
+
+       published := false
+       defer func() {
+               if !published {
+                       subagents.Release(name)
+               }
+       }()
+
+       staged, err := os.MkdirTemp(a.dir, ".child-*")
+       if err != nil {
+               return nil, fmt.Errorf("prepare child directory: %w", err)
+       }
+
+       defer func() {
+               cleanupErr := os.RemoveAll(staged)
+               if cleanupErr != nil {
+                       err = errors.Join(err, fmt.Errorf("remove prepared child: %w", cleanupErr))
+               }
+       }()
+
+       config := a.config
+       config.Name = name
+       config.ID = ""
+       config.Parent = a.config.Name
+       config.Responsibility = responsibility
+       child, err := writeAgent(staged, config)
+       if err != nil {
+               return nil, fmt.Errorf("write child: %w", err)
+       }
+
+       dir := filepath.Join(a.dir, "children")
+       err = os.MkdirAll(dir, 0o700)
+       if err != nil {
+               return nil, fmt.Errorf("create children directory: %w", err)
+       }
+
+       dir = filepath.Join(dir, name)
+       err = unix.Renameat2(unix.AT_FDCWD, staged, unix.AT_FDCWD, dir, unix.RENAME_NOREPLACE)
+       if err != nil {
+               return nil, fmt.Errorf("publish child directory: %w", err)
+       }
+
+       published = true
+       child.dir = dir
+
+       return child, nil

 }
 
 // SubagentPrompt returns the system prompt of a subagent of the agent, with the
 }
 
 // SubagentPrompt returns the system prompt of a subagent of the agent, with the


@@ -119,13 +279,15 @@ func (a *Agent) instructions() (string, error) {
 // made once when the file is made, and never changes. The cache key comes from
 // the ID, so a rename keeps the prompt cache and two agents with one name do
 // not share a key. Workdir is the directory where the commands of the agent
 // made once when the file is made, and never changes. The cache key comes from
 // the ID, so a rename keeps the prompt cache and two agents with one name do
 // not share a key. Workdir is the directory where the commands of the agent

-// run.
+// run. Responsibility and Parent are set together for a child agent.

 type AgentConfig struct {
 type AgentConfig struct {

-       Name    string `json:"name"`
-       ID      string `json:"id"`
-       Model   string `json:"model"`
-       Effort  string `json:"effort"`
-       Workdir string `json:"workdir"`
+       Name           string `json:"name"`
+       ID             string `json:"id"`
+       Model          string `json:"model"`
+       Effort         string `json:"effort"`
+       Workdir        string `json:"workdir"`
+       Responsibility string `json:"responsibility,omitempty"`
+       Parent         string `json:"parent,omitempty"`

 }
 
 // validate makes sure that each setting has a valid value.
 }
 
 // validate makes sure that each setting has a valid value.


@@ -143,6 +305,14 @@ func (c AgentConfig) validate() error {
                return errors.New("agent needs a model and an effort")
        }
 
                return errors.New("agent needs a model and an effort")
        }
 

+       if (strings.TrimSpace(c.Responsibility) == "") != (c.Parent == "") {
+               return errors.New("a child needs both responsibility and parent")
+       }
+
+       if strings.ContainsAny(c.Parent, "\r\n") {
+               return errors.New("parent must be one line of text")
+       }
+

        if !filepath.IsAbs(c.Workdir) {
                return fmt.Errorf("workdir %q is not an absolute path", c.Workdir)
        }
        if !filepath.IsAbs(c.Workdir) {
                return fmt.Errorf("workdir %q is not an absolute path", c.Workdir)
        }


@@ -150,6 +320,23 @@ func (c AgentConfig) validate() error {
        return nil
 }
 
        return nil
 }
 

+// agentChildNameValid accepts one word of 2 to 32 ASCII letters with an initial
+// capital letter. Child names describe their area.
+func agentChildNameValid(name string) bool {
+       if len(name) < 2 || len(name) > 32 || name[0] < 'A' || name[0] > 'Z' {
+               return false
+       }
+
+       for i := 1; i < len(name); i++ {
+               letter := name[i]
+               if (letter < 'A' || letter > 'Z') && (letter < 'a' || letter > 'z') {
+                       return false
+               }
+       }
+
+       return true
+}
+

 // createAgent writes the config.json of a new agent in dir with the defaults
 // and a new ID.
 func createAgent(dir string) (*Agent, error) {
 // createAgent writes the config.json of a new agent in dir with the defaults
 // and a new ID.
 func createAgent(dir string) (*Agent, error) {


@@ -158,8 +345,13 @@ func createAgent(dir string) (*Agent, error) {
                return nil, err
        }
 
                return nil, err
        }
 

+       return writeAgent(dir, config)
+}
+
+// writeAgent gives config a new ID and writes it in dir.
+func writeAgent(dir string, config AgentConfig) (*Agent, error) {

        id := make([]byte, agentIDBytes)
        id := make([]byte, agentIDBytes)

-       _, err = rand.Read(id)
+       _, err := rand.Read(id)

        if err != nil {
                return nil, fmt.Errorf("make agent ID: %w", err)
        }
        if err != nil {
                return nil, fmt.Errorf("make agent ID: %w", err)
        }