diff --git a/cli/__init__.py b/cli/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/cli/main.py b/cli/main.py
new file mode 100644
index 0000000..e018127
--- /dev/null
+++ b/cli/main.py
@@ -0,0 +1,412 @@
+"""
+Kin CLI — command-line interface for the multi-agent orchestrator.
+Uses core.models for all data access, never raw SQL.
+"""
+
+import json
+import sys
+from pathlib import Path
+
+import click
+
+# Ensure project root is on sys.path
+sys.path.insert(0, str(Path(__file__).parent.parent))
+
+from core.db import init_db
+from core import models
+
+DEFAULT_DB = Path.home() / ".kin" / "kin.db"
+
+
+def get_conn(db_path: Path = DEFAULT_DB):
+    db_path.parent.mkdir(parents=True, exist_ok=True)
+    return init_db(db_path)
+
+
+def _parse_json(ctx, param, value):
+    """Click callback: parse a JSON string or return None."""
+    if value is None:
+        return None
+    try:
+        return json.loads(value)
+    except json.JSONDecodeError:
+        raise click.BadParameter(f"Invalid JSON: {value}")
+
+
+def _table(headers: list[str], rows: list[list[str]], min_width: int = 6):
+    """Render a simple aligned text table."""
+    widths = [max(min_width, len(h)) for h in headers]
+    for row in rows:
+        for i, cell in enumerate(row):
+            if i < len(widths):
+                widths[i] = max(widths[i], len(str(cell)))
+    fmt = "  ".join(f"{{:<{w}}}" for w in widths)
+    lines = [fmt.format(*headers), fmt.format(*("-" * w for w in widths))]
+    for row in rows:
+        lines.append(fmt.format(*[str(c) for c in row]))
+    return "\n".join(lines)
+
+
+def _auto_task_id(conn, project_id: str) -> str:
+    """Generate next task ID like PROJ-001."""
+    prefix = project_id.upper()
+    existing = models.list_tasks(conn, project_id=project_id)
+    max_num = 0
+    for t in existing:
+        tid = t["id"]
+        if tid.startswith(prefix + "-"):
+            try:
+                num = int(tid.split("-", 1)[1])
+                max_num = max(max_num, num)
+            except ValueError:
+                pass
+    return f"{prefix}-{max_num + 1:03d}"
+
+
+# ===========================================================================
+# Root group
+# ===========================================================================
+
+@click.group()
+@click.option("--db", type=click.Path(), default=None, envvar="KIN_DB",
+              help="Path to kin.db (default: ~/.kin/kin.db, or $KIN_DB)")
+@click.pass_context
+def cli(ctx, db):
+    """Kin — multi-agent project orchestrator."""
+    ctx.ensure_object(dict)
+    db_path = Path(db) if db else DEFAULT_DB
+    ctx.obj["conn"] = get_conn(db_path)
+
+
+# ===========================================================================
+# project
+# ===========================================================================
+
+@cli.group()
+def project():
+    """Manage projects."""
+
+
+@project.command("add")
+@click.argument("id")
+@click.argument("name")
+@click.argument("path")
+@click.option("--tech-stack", callback=_parse_json, default=None, help='JSON array, e.g. \'["vue3","nuxt"]\'')
+@click.option("--status", default="active")
+@click.option("--priority", type=int, default=5)
+@click.pass_context
+def project_add(ctx, id, name, path, tech_stack, status, priority):
+    """Add a new project."""
+    conn = ctx.obj["conn"]
+    p = models.create_project(conn, id, name, path,
+                              tech_stack=tech_stack, status=status, priority=priority)
+    click.echo(f"Created project: {p['id']} ({p['name']})")
+
+
+@project.command("list")
+@click.option("--status", default=None)
+@click.pass_context
+def project_list(ctx, status):
+    """List projects."""
+    conn = ctx.obj["conn"]
+    projects = models.list_projects(conn, status=status)
+    if not projects:
+        click.echo("No projects found.")
+        return
+    rows = [[p["id"], p["name"], p["status"], str(p["priority"]), p["path"]]
+            for p in projects]
+    click.echo(_table(["ID", "Name", "Status", "Pri", "Path"], rows))
+
+
+@project.command("show")
+@click.argument("id")
+@click.pass_context
+def project_show(ctx, id):
+    """Show project details."""
+    conn = ctx.obj["conn"]
+    p = models.get_project(conn, id)
+    if not p:
+        click.echo(f"Project '{id}' not found.", err=True)
+        raise SystemExit(1)
+    click.echo(f"Project: {p['id']}")
+    click.echo(f"  Name:       {p['name']}")
+    click.echo(f"  Path:       {p['path']}")
+    click.echo(f"  Status:     {p['status']}")
+    click.echo(f"  Priority:   {p['priority']}")
+    if p.get("tech_stack"):
+        click.echo(f"  Tech stack: {', '.join(p['tech_stack'])}")
+    if p.get("forgejo_repo"):
+        click.echo(f"  Forgejo:    {p['forgejo_repo']}")
+    click.echo(f"  Created:    {p['created_at']}")
+
+
+# ===========================================================================
+# task
+# ===========================================================================
+
+@cli.group()
+def task():
+    """Manage tasks."""
+
+
+@task.command("add")
+@click.argument("project_id")
+@click.argument("title")
+@click.option("--type", "route_type", type=click.Choice(["debug", "feature", "refactor", "hotfix"]), default=None)
+@click.option("--priority", type=int, default=5)
+@click.pass_context
+def task_add(ctx, project_id, title, route_type, priority):
+    """Add a task to a project. ID is auto-generated (PROJ-001)."""
+    conn = ctx.obj["conn"]
+    p = models.get_project(conn, project_id)
+    if not p:
+        click.echo(f"Project '{project_id}' not found.", err=True)
+        raise SystemExit(1)
+    task_id = _auto_task_id(conn, project_id)
+    brief = {"route_type": route_type} if route_type else None
+    t = models.create_task(conn, task_id, project_id, title,
+                           priority=priority, brief=brief)
+    click.echo(f"Created task: {t['id']} — {t['title']}")
+
+
+@task.command("list")
+@click.option("--project", "project_id", default=None)
+@click.option("--status", default=None)
+@click.pass_context
+def task_list(ctx, project_id, status):
+    """List tasks."""
+    conn = ctx.obj["conn"]
+    tasks = models.list_tasks(conn, project_id=project_id, status=status)
+    if not tasks:
+        click.echo("No tasks found.")
+        return
+    rows = [[t["id"], t["project_id"], t["title"][:40], t["status"],
+             str(t["priority"]), t.get("assigned_role") or "-"]
+            for t in tasks]
+    click.echo(_table(["ID", "Project", "Title", "Status", "Pri", "Role"], rows))
+
+
+@task.command("show")
+@click.argument("id")
+@click.pass_context
+def task_show(ctx, id):
+    """Show task details."""
+    conn = ctx.obj["conn"]
+    t = models.get_task(conn, id)
+    if not t:
+        click.echo(f"Task '{id}' not found.", err=True)
+        raise SystemExit(1)
+    click.echo(f"Task: {t['id']}")
+    click.echo(f"  Project:  {t['project_id']}")
+    click.echo(f"  Title:    {t['title']}")
+    click.echo(f"  Status:   {t['status']}")
+    click.echo(f"  Priority: {t['priority']}")
+    if t.get("assigned_role"):
+        click.echo(f"  Role:     {t['assigned_role']}")
+    if t.get("parent_task_id"):
+        click.echo(f"  Parent:   {t['parent_task_id']}")
+    if t.get("brief"):
+        click.echo(f"  Brief:    {json.dumps(t['brief'], ensure_ascii=False)}")
+    if t.get("spec"):
+        click.echo(f"  Spec:     {json.dumps(t['spec'], ensure_ascii=False)}")
+    click.echo(f"  Created:  {t['created_at']}")
+    click.echo(f"  Updated:  {t['updated_at']}")
+
+
+# ===========================================================================
+# decision
+# ===========================================================================
+
+@cli.group()
+def decision():
+    """Manage decisions and gotchas."""
+
+
+@decision.command("add")
+@click.argument("project_id")
+@click.argument("type", type=click.Choice(["decision", "gotcha", "workaround", "rejected_approach", "convention"]))
+@click.argument("title")
+@click.argument("description")
+@click.option("--category", default=None)
+@click.option("--tags", callback=_parse_json, default=None, help='JSON array, e.g. \'["ios","css"]\'')
+@click.option("--task-id", default=None)
+@click.pass_context
+def decision_add(ctx, project_id, type, title, description, category, tags, task_id):
+    """Record a decision, gotcha, or convention."""
+    conn = ctx.obj["conn"]
+    p = models.get_project(conn, project_id)
+    if not p:
+        click.echo(f"Project '{project_id}' not found.", err=True)
+        raise SystemExit(1)
+    d = models.add_decision(conn, project_id, type, title, description,
+                            category=category, tags=tags, task_id=task_id)
+    click.echo(f"Added {d['type']}: #{d['id']} — {d['title']}")
+
+
+@decision.command("list")
+@click.argument("project_id")
+@click.option("--category", default=None)
+@click.option("--tag", multiple=True, help="Filter by tag (can repeat)")
+@click.option("--type", "types", multiple=True,
+              type=click.Choice(["decision", "gotcha", "workaround", "rejected_approach", "convention"]),
+              help="Filter by type (can repeat)")
+@click.pass_context
+def decision_list(ctx, project_id, category, tag, types):
+    """List decisions for a project."""
+    conn = ctx.obj["conn"]
+    tags_list = list(tag) if tag else None
+    types_list = list(types) if types else None
+    decisions = models.get_decisions(conn, project_id, category=category,
+                                     tags=tags_list, types=types_list)
+    if not decisions:
+        click.echo("No decisions found.")
+        return
+    rows = [[str(d["id"]), d["type"], d["category"] or "-",
+             d["title"][:50], d["created_at"][:10]]
+            for d in decisions]
+    click.echo(_table(["#", "Type", "Category", "Title", "Date"], rows))
+
+
+# ===========================================================================
+# module
+# ===========================================================================
+
+@cli.group()
+def module():
+    """Manage project modules."""
+
+
+@module.command("add")
+@click.argument("project_id")
+@click.argument("name")
+@click.argument("type", type=click.Choice(["frontend", "backend", "shared", "infra"]))
+@click.argument("path")
+@click.option("--description", default=None)
+@click.option("--owner-role", default=None)
+@click.pass_context
+def module_add(ctx, project_id, name, type, path, description, owner_role):
+    """Register a project module."""
+    conn = ctx.obj["conn"]
+    p = models.get_project(conn, project_id)
+    if not p:
+        click.echo(f"Project '{project_id}' not found.", err=True)
+        raise SystemExit(1)
+    m = models.add_module(conn, project_id, name, type, path,
+                          description=description, owner_role=owner_role)
+    click.echo(f"Added module: {m['name']} ({m['type']}) at {m['path']}")
+
+
+@module.command("list")
+@click.argument("project_id")
+@click.pass_context
+def module_list(ctx, project_id):
+    """List modules for a project."""
+    conn = ctx.obj["conn"]
+    mods = models.get_modules(conn, project_id)
+    if not mods:
+        click.echo("No modules found.")
+        return
+    rows = [[m["name"], m["type"], m["path"], m.get("owner_role") or "-",
+             m.get("description") or ""]
+            for m in mods]
+    click.echo(_table(["Name", "Type", "Path", "Owner", "Description"], rows))
+
+
+# ===========================================================================
+# status
+# ===========================================================================
+
+@cli.command("status")
+@click.argument("project_id", required=False)
+@click.pass_context
+def status(ctx, project_id):
+    """Project status overview. Without args — all projects. With id — detailed."""
+    conn = ctx.obj["conn"]
+
+    if project_id:
+        p = models.get_project(conn, project_id)
+        if not p:
+            click.echo(f"Project '{project_id}' not found.", err=True)
+            raise SystemExit(1)
+        tasks = models.list_tasks(conn, project_id=project_id)
+        counts = {}
+        for t in tasks:
+            counts[t["status"]] = counts.get(t["status"], 0) + 1
+
+        click.echo(f"Project: {p['id']} — {p['name']} [{p['status']}]")
+        click.echo(f"  Path: {p['path']}")
+        if p.get("tech_stack"):
+            click.echo(f"  Stack: {', '.join(p['tech_stack'])}")
+        click.echo(f"  Tasks: {len(tasks)} total")
+        for s in ["pending", "in_progress", "review", "done", "blocked"]:
+            if counts.get(s, 0) > 0:
+                click.echo(f"    {s}: {counts[s]}")
+        if tasks:
+            click.echo("")
+            rows = [[t["id"], t["title"][:40], t["status"],
+                     t.get("assigned_role") or "-"]
+                    for t in tasks]
+            click.echo(_table(["ID", "Title", "Status", "Role"], rows))
+    else:
+        summary = models.get_project_summary(conn)
+        if not summary:
+            click.echo("No projects.")
+            return
+        rows = [[s["id"], s["name"][:25], s["status"], str(s["priority"]),
+                 str(s["total_tasks"]), str(s["done_tasks"]),
+                 str(s["active_tasks"]), str(s["blocked_tasks"])]
+                for s in summary]
+        click.echo(_table(
+            ["ID", "Name", "Status", "Pri", "Total", "Done", "Active", "Blocked"],
+            rows,
+        ))
+
+
+# ===========================================================================
+# cost
+# ===========================================================================
+
+@cli.command("cost")
+@click.option("--last", "period", default="7d", help="Period: 7d, 30d, etc.")
+@click.pass_context
+def cost(ctx, period):
+    """Show cost summary by project."""
+    # Parse period like "7d", "30d"
+    period = period.strip().lower()
+    if period.endswith("d"):
+        try:
+            days = int(period[:-1])
+        except ValueError:
+            click.echo(f"Invalid period: {period}. Use e.g. 7d, 30d.", err=True)
+            raise SystemExit(1)
+    else:
+        try:
+            days = int(period)
+        except ValueError:
+            click.echo(f"Invalid period: {period}. Use e.g. 7d, 30d.", err=True)
+            raise SystemExit(1)
+
+    conn = ctx.obj["conn"]
+    costs = models.get_cost_summary(conn, days=days)
+    if not costs:
+        click.echo(f"No agent runs in the last {days} days.")
+        return
+    rows = [[c["project_id"], c["project_name"][:25], str(c["runs"]),
+             f"{c['total_tokens']:,}", f"${c['total_cost_usd']:.4f}",
+             f"{c['total_duration_seconds']}s"]
+            for c in costs]
+    click.echo(f"Cost summary (last {days} days):\n")
+    click.echo(_table(
+        ["Project", "Name", "Runs", "Tokens", "Cost", "Time"],
+        rows,
+    ))
+    total = sum(c["total_cost_usd"] for c in costs)
+    click.echo(f"\nTotal: ${total:.4f}")
+
+
+# ===========================================================================
+# Entry point
+# ===========================================================================
+
+if __name__ == "__main__":
+    cli()
diff --git a/pyproject.toml b/pyproject.toml
new file mode 100644
index 0000000..aaace4a
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,16 @@
+[build-system]
+requires = ["setuptools>=68.0"]
+build-backend = "setuptools.backends._legacy:_Backend"
+
+[project]
+name = "kin"
+version = "0.1.0"
+description = "Multi-agent project orchestrator"
+requires-python = ">=3.11"
+dependencies = ["click>=8.0"]
+
+[project.scripts]
+kin = "cli.main:cli"
+
+[tool.pytest.ini_options]
+testpaths = ["tests"]
diff --git a/tests/test_cli.py b/tests/test_cli.py
new file mode 100644
index 0000000..b19551b
--- /dev/null
+++ b/tests/test_cli.py
@@ -0,0 +1,207 @@
+"""Tests for cli/main.py using click's CliRunner with in-memory-like temp DB."""
+
+import json
+import tempfile
+from pathlib import Path
+
+import pytest
+from click.testing import CliRunner
+
+from cli.main import cli
+
+
+@pytest.fixture
+def runner(tmp_path):
+    """CliRunner that uses a temp DB file."""
+    db_path = tmp_path / "test.db"
+    return CliRunner(), ["--db", str(db_path)]
+
+
+def invoke(runner_tuple, args):
+    runner, base = runner_tuple
+    result = runner.invoke(cli, base + args)
+    return result
+
+
+# -- project --
+
+def test_project_add_and_list(runner):
+    r = invoke(runner, ["project", "add", "vdol", "В долю поперёк",
+                        "~/projects/vdolipoperek", "--tech-stack", '["vue3","nuxt"]'])
+    assert r.exit_code == 0
+    assert "vdol" in r.output
+
+    r = invoke(runner, ["project", "list"])
+    assert r.exit_code == 0
+    assert "vdol" in r.output
+    assert "В долю поперёк" in r.output
+
+
+def test_project_list_empty(runner):
+    r = invoke(runner, ["project", "list"])
+    assert r.exit_code == 0
+    assert "No projects" in r.output
+
+
+def test_project_list_filter_status(runner):
+    invoke(runner, ["project", "add", "a", "A", "/a", "--status", "active"])
+    invoke(runner, ["project", "add", "b", "B", "/b", "--status", "paused"])
+
+    r = invoke(runner, ["project", "list", "--status", "active"])
+    assert "a" in r.output
+    assert "b" not in r.output
+
+
+def test_project_show(runner):
+    invoke(runner, ["project", "add", "vdol", "В долю", "/vdol",
+                    "--tech-stack", '["vue3"]', "--priority", "2"])
+    r = invoke(runner, ["project", "show", "vdol"])
+    assert r.exit_code == 0
+    assert "vue3" in r.output
+    assert "Priority:   2" in r.output
+
+
+def test_project_show_not_found(runner):
+    r = invoke(runner, ["project", "show", "nope"])
+    assert r.exit_code == 1
+    assert "not found" in r.output
+
+
+# -- task --
+
+def test_task_add_and_list(runner):
+    invoke(runner, ["project", "add", "p1", "P1", "/p1"])
+    r = invoke(runner, ["task", "add", "p1", "Fix login bug", "--type", "debug"])
+    assert r.exit_code == 0
+    assert "P1-001" in r.output
+
+    r = invoke(runner, ["task", "add", "p1", "Add search"])
+    assert "P1-002" in r.output
+
+    r = invoke(runner, ["task", "list"])
+    assert "P1-001" in r.output
+    assert "P1-002" in r.output
+
+
+def test_task_add_project_not_found(runner):
+    r = invoke(runner, ["task", "add", "nope", "Some task"])
+    assert r.exit_code == 1
+    assert "not found" in r.output
+
+
+def test_task_list_filter(runner):
+    invoke(runner, ["project", "add", "p1", "P1", "/p1"])
+    invoke(runner, ["project", "add", "p2", "P2", "/p2"])
+    invoke(runner, ["task", "add", "p1", "A"])
+    invoke(runner, ["task", "add", "p2", "B"])
+
+    r = invoke(runner, ["task", "list", "--project", "p1"])
+    assert "P1-001" in r.output
+    assert "P2-001" not in r.output
+
+
+def test_task_show(runner):
+    invoke(runner, ["project", "add", "p1", "P1", "/p1"])
+    invoke(runner, ["task", "add", "p1", "Fix bug", "--type", "debug"])
+    r = invoke(runner, ["task", "show", "P1-001"])
+    assert r.exit_code == 0
+    assert "Fix bug" in r.output
+
+
+def test_task_show_not_found(runner):
+    r = invoke(runner, ["task", "show", "X-999"])
+    assert r.exit_code == 1
+    assert "not found" in r.output
+
+
+# -- decision --
+
+def test_decision_add_and_list(runner):
+    invoke(runner, ["project", "add", "p1", "P1", "/p1"])
+    r = invoke(runner, ["decision", "add", "p1", "gotcha",
+                        "Safari bug", "position:fixed breaks",
+                        "--category", "ui", "--tags", '["ios","css"]'])
+    assert r.exit_code == 0
+    assert "gotcha" in r.output
+
+    r = invoke(runner, ["decision", "list", "p1"])
+    assert "Safari bug" in r.output
+
+
+def test_decision_list_filter(runner):
+    invoke(runner, ["project", "add", "p1", "P1", "/p1"])
+    invoke(runner, ["decision", "add", "p1", "gotcha", "A", "a", "--category", "ui"])
+    invoke(runner, ["decision", "add", "p1", "decision", "B", "b", "--category", "arch"])
+
+    r = invoke(runner, ["decision", "list", "p1", "--type", "gotcha"])
+    assert "A" in r.output
+    assert "B" not in r.output
+
+
+# -- module --
+
+def test_module_add_and_list(runner):
+    invoke(runner, ["project", "add", "p1", "P1", "/p1"])
+    r = invoke(runner, ["module", "add", "p1", "search", "frontend", "src/search/",
+                        "--description", "Search UI"])
+    assert r.exit_code == 0
+    assert "search" in r.output
+
+    r = invoke(runner, ["module", "list", "p1"])
+    assert "search" in r.output
+    assert "Search UI" in r.output
+
+
+# -- status --
+
+def test_status_all(runner):
+    invoke(runner, ["project", "add", "p1", "P1", "/p1"])
+    invoke(runner, ["task", "add", "p1", "A"])
+    invoke(runner, ["task", "add", "p1", "B"])
+
+    r = invoke(runner, ["status"])
+    assert r.exit_code == 0
+    assert "p1" in r.output
+    assert "2" in r.output  # total tasks
+
+
+def test_status_single_project(runner):
+    invoke(runner, ["project", "add", "p1", "P1", "/p1"])
+    invoke(runner, ["task", "add", "p1", "A"])
+
+    r = invoke(runner, ["status", "p1"])
+    assert r.exit_code == 0
+    assert "P1-001" in r.output
+    assert "pending" in r.output
+
+
+def test_status_not_found(runner):
+    r = invoke(runner, ["status", "nope"])
+    assert r.exit_code == 1
+    assert "not found" in r.output
+
+
+# -- cost --
+
+def test_cost_empty(runner):
+    r = invoke(runner, ["cost"])
+    assert r.exit_code == 0
+    assert "No agent runs" in r.output
+
+
+def test_cost_with_data(runner):
+    invoke(runner, ["project", "add", "p1", "P1", "/p1"])
+    # Insert agent log directly via models (no CLI command for this)
+    from core.db import init_db
+    from core import models as m
+    # Re-open the same DB the runner uses
+    db_path = runner[1][1]
+    conn = init_db(Path(db_path))
+    m.log_agent_run(conn, "p1", "dev", "implement",
+                    cost_usd=0.10, tokens_used=5000)
+    conn.close()
+
+    r = invoke(runner, ["cost", "--last", "7d"])
+    assert r.exit_code == 0
+    assert "p1" in r.output
+    assert "$0.1000" in r.output