feat(affordance): per-command usage guidance system (markdown source)

Adds the affordance mechanism: per-command usage guidance authored as one
markdown file per domain under affordance/, surfaced in `--help` and the schema
output and read directly at runtime (lazy, cached). See affordance/README.md for
the format; contact is included as a worked example. Remaining domains land in
follow-up changes.

Also trims a couple of redundant lines from the contact skill.

Author: liangshuo-1

affordance/README.md

@@ -0,0 +1,49 @@
+# Affordance
+
+Per-command usage guidance for the CLI, authored as one markdown file per domain
+(`<service>.md`). It is surfaced in `lark-cli <command> --help` and in the
+`schema` output, and read directly at runtime (lazy, cached) — there is no build
+step. Maintain these files alongside `skills/` and `shortcuts/`.
+
+## Format
+
+A small, fixed markdown subset; each file describes one domain:
+
+    # <domain>            optional `> skill: <name>` applies to every command below
+    ## <command>          the command as typed, minus `lark-cli <domain>`
+    <lead paragraph>      when to use this command
+    ### Avoid when        when not to use it / which command to use instead
+    ### Prerequisites     what you must have first (e.g. an id, and where it comes from)
+    ### Tips              gotchas and constraints
+    ### Examples          **description** lines, each followed by a fenced command
+    ### <other heading>   a custom section; flows through verbatim
+
+Reference another command with `[[command]]` — it renders as `command` in help.
+Under `Avoid when` it means "use that one instead"; under `Prerequisites`
+("… from [[command]]") it means "get the input there first".
+
+## Example
+
+    ## messages get
+    Fetch the full content of a single message by id.
+
+    ### Avoid when
+    - Reading several at once → use [[messages batch_get]]
+
+    ### Prerequisites
+    - message_id from [[messages list]]
+
+    ### Examples
+
+    **Fetch one message**
+    ```bash
+    lark-cli mail user_mailbox.messages get --message-id "<id>"
+    ```
+
+## Notes
+
+- Write plain prose; the only convention is wrapping command references in `[[ ]]`.
+- Keep it concise and high-signal — don't restate field/flag names, id types, or
+  anything the schema and flags already show; the agent infers the rest.
+- Command-form headings resolve to method ids via the registry, so plural resource
+  names (`messages`) map to the singular method id (`message`) automatically.

affordance/contact.md

@@ -0,0 +1,19 @@
+# contact
+> skill: lark-contact
+
+## user_profiles batch_query
+Bulk-fetch personal status and signature for user ids you already have.
+
+### Avoid when
+- Need more than status/signature (name, dept, email), or don't have the open_id yet → use [[+search-user]]
+
+### Tips
+- Off by default — set include_personal_status / include_description to true under query_option
+- ids in user_ids must match --user-id-type (default open_id)
+
+### Examples
+
+**Bulk-query status and signature**
+```bash
+lark-cli contact user_profiles batch_query --data '{"user_ids":["ou_3a8b****6a7b"],"query_option":{"include_personal_status":true,"include_description":true}}'
+```

cmd/api/api.go

@@ -67,8 +67,21 @@ func NewCmdApiWithContext(ctx context.Context, f *cmdutil.Factory, runF func(*AP
 
 	cmd := &cobra.Command{
 		Use:   "api <method> <path>",
-		Short: "Generic Lark API requests",
-		Args:  cobra.ExactArgs(2),
+		Short: "Raw HTTP escape hatch — call any endpoint by path (fallback when no typed command exists)",
+		Long: `Raw HTTP escape hatch: send any Lark API request by HTTP method + path.
+
+Prefer the typed domain command when one exists — it validates parameters,
+shows the Risk level, gates destructive calls behind --yes, and carries usage
+guidance that this raw command does not. If a domain command covers your task
+(browse with ` + "`lark-cli <domain> --help`" + `), use it instead of this.
+
+Reach for ` + "`api`" + ` only for endpoints that have no typed command yet (e.g.
+newer/preview APIs), where you already have the HTTP path from the Lark docs.
+
+Examples:
+  lark-cli api GET /open-apis/calendar/v4/calendars
+  lark-cli api POST /open-apis/im/v1/messages --params '{"receive_id_type":"open_id"}' --data @body.json`,
+		Args: cobra.ExactArgs(2),
 		RunE: func(cmd *cobra.Command, args []string) error {
 			opts.Method = strings.ToUpper(args[0])
 			opts.Path = args[1]

cmd/build.go

@@ -170,6 +170,10 @@ func buildInternal(ctx context.Context, inv cmdutil.InvocationContext, opts ...B
 	rootCmd.SetOut(cfg.streams.Out)
 	rootCmd.SetErr(cfg.streams.ErrOut)
 
+	// Root-only usage template (curated Usage synopsis + skills footer); see
+	// rootUsageTemplate.
+	rootCmd.SetUsageTemplate(rootUsageTemplate)
+
 	installTipsHelpFunc(rootCmd)
 	rootCmd.SilenceErrors = true
 	// SilenceUsage as a static field (not only in PersistentPreRun) so it also
@@ -205,6 +209,8 @@ func buildInternal(ctx context.Context, inv cmdutil.InvocationContext, opts ...B
 	}
 	shortcuts.RegisterShortcutsWithContext(ctx, rootCmd, f)
 
+	groupRootCommands(rootCmd)
+
 	installUnknownSubcommandGuard(rootCmd)
 
 	if mode := f.ResolveStrictMode(ctx); mode.IsActive() && !cfg.skipStrictMode {

cmd/root.go

@@ -11,9 +11,11 @@ import (
 	"sort"
 	"strings"
 
+	"github.com/larksuite/cli/cmd/service"
 	"github.com/larksuite/cli/errs"
 	"github.com/larksuite/cli/extension/platform"
 	"github.com/larksuite/cli/internal/build"
+	"github.com/larksuite/cli/internal/cmdmeta"
 	"github.com/larksuite/cli/internal/cmdpolicy"
 	"github.com/larksuite/cli/internal/cmdutil"
 	"github.com/larksuite/cli/internal/deprecation"
@@ -28,43 +30,60 @@ import (
 
 const rootLong = `lark-cli — Lark/Feishu CLI tool.
 
-USAGE:
-    lark-cli <command> [subcommand] [method] [options]
-    lark-cli api <method> <path> [--params <json>] [--data <json>]
-    lark-cli schema <service.resource.method>
+AGENT QUICKSTART (driving this as an agent? start here):
+    Browse commands:  lark-cli <domain> --help            # +shortcuts (preferred) and raw API resources
+    Inspect a call:   lark-cli schema <service>.<resource>.<method>   # params, types, scopes, examples
+    Prefer a +shortcut over the raw API resource when one matches the task.
+    Risk: each command's --help shows read | write | high-risk-write;
+          high-risk-write needs --yes, only after the user confirms.
+    On any API call: --jq <expr> filters JSON output, --dry-run previews the request (runs nothing).
 
-EXAMPLES:
-    # View upcoming events
-    lark-cli calendar +agenda
+EXAMPLES (one per command style, in order of preference):
+    lark-cli calendar +agenda                                       # +shortcut — a high-level task, prefer these
+    lark-cli mail user_mailbox.messages list --user-mailbox-id me   # typed command for one API method
+    lark-cli schema mail.user_mailbox.messages.list                 # inspect a method's params before calling
+    lark-cli api GET /open-apis/calendar/v4/calendars               # raw escape hatch — any endpoint by HTTP path`
 
-    # List calendar events
-    lark-cli calendar events instance_view --params '{"calendar_id":"primary","start_time":"1700000000","end_time":"1700086400"}'
+// rootUsageTemplate is cobra's default usage template with two root-only
+// additions gated on {{if not .HasParent}}: a curated multi-form Usage synopsis
+// (replacing cobra's generic "[flags] / [command]") and a human skills-setup
+// footer. Subcommands render the stock template unchanged. The rest is verbatim
+// cobra so the command groups and flags are untouched.
+const rootUsageTemplate = `{{if .HasParent}}Usage:{{if .Runnable}}
+  {{.UseLine}}{{end}}{{if .HasAvailableSubCommands}}
+  {{.CommandPath}} [command]{{end}}{{else}}Usage:
+  lark-cli <command> [subcommand] [method] [flags]
+  lark-cli api <method> <path> [--params <json>] [--data <json>]
+  lark-cli schema <service.resource.method>{{end}}{{if gt (len .Aliases) 0}}
 
-    # Search users
-    lark-cli contact +search-user --query "John"
+Aliases:
+  {{.NameAndAliases}}{{end}}{{if .HasExample}}
 
-    # Generic API call
-    lark-cli api GET /open-apis/calendar/v4/calendars
+Examples:
+{{.Example}}{{end}}{{if .HasAvailableSubCommands}}{{$cmds := .Commands}}{{if eq (len .Groups) 0}}
 
-AI AGENT SKILLS:
-    lark-cli pairs with AI agent skills (Claude Code, etc.) that
-    teach the agent Lark API patterns, best practices, and workflows.
+Available Commands:{{range $cmds}}{{if (or .IsAvailableCommand (eq .Name "help"))}}
+  {{rpad .Name .NamePadding }} {{.Short}}{{end}}{{end}}{{else}}{{range $group := .Groups}}
 
-    Install all skills:
-        npx skills add larksuite/cli -g -y
+{{.Title}}{{range $cmds}}{{if (and (eq .GroupID $group.ID) (or .IsAvailableCommand (eq .Name "help")))}}
+  {{rpad .Name .NamePadding }} {{.Short}}{{end}}{{end}}{{end}}{{if not .AllChildCommandsHaveGroup}}
 
-    Or pick specific domains:
-        npx skills add larksuite/cli -s lark-calendar -y
-        npx skills add larksuite/cli -s lark-im -y
+Additional Commands:{{range $cmds}}{{if (and (eq .GroupID "") (or .IsAvailableCommand (eq .Name "help")))}}
+  {{rpad .Name .NamePadding }} {{.Short}}{{end}}{{end}}{{end}}{{end}}{{end}}{{if .HasAvailableLocalFlags}}
 
-    Learn more: https://github.com/larksuite/cli#agent-skills
+Flags:
+{{.LocalFlags.FlagUsages | trimTrailingWhitespaces}}{{end}}{{if .HasAvailableInheritedFlags}}
 
-COMMUNITY:
-    GitHub:     https://github.com/larksuite/cli
-    Issues:     https://github.com/larksuite/cli/issues
-    Docs:       https://open.feishu.cn/document/
+Global Flags:
+{{.InheritedFlags.FlagUsages | trimTrailingWhitespaces}}{{end}}{{if .HasHelpSubCommands}}
 
-More help: lark-cli <command> --help`
+Additional help topics:{{range .Commands}}{{if .IsAdditionalHelpTopicCommand}}
+  {{rpad .CommandPath .CommandPathPadding}} {{.Short}}{{end}}{{end}}{{end}}{{if .HasAvailableSubCommands}}
+
+Use "{{.CommandPath}} [command] --help" for more information about a command.{{end}}{{if not .HasParent}}
+
+Skills setup (one-time, humans): npx skills add larksuite/cli -g -y — https://github.com/larksuite/cli#agent-skills{{end}}
+`
 
 // Execute runs the root command and returns the process exit code.
 // rawInvocationArgs holds os.Args[1:] captured at Execute() entry. cobra's
@@ -529,6 +548,49 @@ func availableSubcommandNames(cmd *cobra.Command) (available, deprecated []strin
 	return available, deprecated
 }
 
+// Root command help groups, so an agent sees content domains, agent tooling, and
+// CLI management as distinct blocks instead of one flat alphabetical dump.
+const (
+	groupDomains    = "lark-domains"
+	groupTooling    = "agent-tooling"
+	groupManagement = "cli-management"
+)
+
+// groupRootCommands classifies root's direct children into the help groups,
+// called once after all commands are registered. Unclassified commands fall to
+// cobra's "Additional Commands" section.
+func groupRootCommands(root *cobra.Command) {
+	root.AddGroup(
+		&cobra.Group{ID: groupDomains, Title: "Lark domains:"},
+		&cobra.Group{ID: groupTooling, Title: "Agent tooling:"},
+		&cobra.Group{ID: groupManagement, Title: "CLI management:"},
+	)
+	tooling := map[string]bool{"api": true, "schema": true, "skills": true}
+	management := map[string]bool{"auth": true, "config": true, "profile": true, "doctor": true, "update": true}
+	for _, c := range root.Commands() {
+		if c.GroupID != "" {
+			continue
+		}
+		switch {
+		case tooling[c.Name()]:
+			c.GroupID = groupTooling
+		case management[c.Name()]:
+			c.GroupID = groupManagement
+		case isLarkDomain(c):
+			c.GroupID = groupDomains
+		}
+	}
+}
+
+// isLarkDomain reports whether a root child is a Lark domain (service-sourced or
+// shortcut-tagged), not CLI tooling. Mirrors service.PrepareDomainHelp.
+func isLarkDomain(c *cobra.Command) bool {
+	if src, _ := cmdmeta.SourceOf(c); src == cmdmeta.SourceService {
+		return true
+	}
+	return cmdmeta.Domain(c) != ""
+}
+
 // flagDidYouMean is the root FlagErrorFunc (inherited by all subcommands). It
 // converts cobra's flag-parse errors into a typed validation envelope: an
 // unknown flag gets a focused "did you mean" hint (so agents recover even when
@@ -610,6 +672,17 @@ func installTipsHelpFunc(root *cobra.Command) {
 				defer func() { f.Hidden = true }()
 			}
 		}
+		// Domain and method commands compose their agent guidance into Long lazily
+		// here (shortcuts attach after service registration); both skip the generic
+		// bottom-of-help append below.
+		if service.PrepareDomainHelp(cmd, embeddedSkillContent) {
+			defaultHelp(cmd, args)
+			return
+		}
+		if service.PrepareMethodHelp(cmd) {
+			defaultHelp(cmd, args)
+			return
+		}
 		defaultHelp(cmd, args)
 		out := cmd.OutOrStdout()
 		if level, ok := cmdutil.GetRisk(cmd); ok {

cmd/root_test.go

@@ -76,11 +76,13 @@ func TestPersistentPreRunE_ConfigSubcommands(t *testing.T) {
 }
 
 func TestRootLong_AgentSkillsLinkTargetsReadmeSection(t *testing.T) {
-	if !strings.Contains(rootLong, "https://github.com/larksuite/cli#agent-skills") {
-		t.Fatalf("root help should link to the README Agent Skills section, got:\n%s", rootLong)
+	// The human skills-install guidance now lives in the root usage-template
+	// footer (below the command list), not in the agent-facing Long.
+	if !strings.Contains(rootUsageTemplate, "https://github.com/larksuite/cli#agent-skills") {
+		t.Fatalf("root help footer should link to the README Agent Skills section, got:\n%s", rootUsageTemplate)
 	}
-	if strings.Contains(rootLong, "https://github.com/larksuite/cli#install-ai-agent-skills") {
-		t.Fatalf("root help should not reference the removed install-ai-agent-skills anchor, got:\n%s", rootLong)
+	if strings.Contains(rootUsageTemplate, "https://github.com/larksuite/cli#install-ai-agent-skills") {
+		t.Fatalf("root help should not reference the removed install-ai-agent-skills anchor, got:\n%s", rootUsageTemplate)
 	}
 }