diff --git a/REPO_STRUCTURE.md b/REPO_STRUCTURE.md
index b13c64b..a9b2fe3 100644
--- a/REPO_STRUCTURE.md
+++ b/REPO_STRUCTURE.md
@@ -114,9 +114,11 @@ smriti/
 │   ├── pyproject.toml          Installable as `pip install -e ./cli`
 │   │                             → `smriti` + `smriti-mcp` on PATH
 │   ├── smriti_cli/
-│   │   ├── main.py             argparse dispatcher: init, doctor, space, state,
-│   │   │                         current, checkpoint, fork, restore, compare,
-│   │   │                         branch, claim, worktree, skills, metrics
+│   │   ├── main.py             argparse dispatcher: init, doctor, status, space,
+│   │   │                         state, current, checkpoint, fork, restore,
+│   │   │                         compare, branch, claim, worktree, skills, metrics
+│   │   ├── attachment.py       Project attachment: read/write `.smriti.json`,
+│   │   │                         the durable repo ↔ space binding
 │   │   ├── mcp_server.py       FastMCP server (21 tools, stdio transport)
 │   │   ├── client.py           SmritiClient HTTP wrapper (includes claims/worktrees)
 │   │   ├── formatters.py       Continuation-oriented markdown renderers
diff --git a/cli/README.md b/cli/README.md
index 3749e4b..2eff871 100644
--- a/cli/README.md
+++ b/cli/README.md
@@ -28,6 +28,39 @@ CLI. For solo use, start the backend with `make dev-local`; for
 Postgres/shared-team use, start it with `make dev-postgres`. The CLI and
 MCP server keep talking to the same HTTP API either way.
 
+## Project attachment
+
+`smriti init <space>` attaches the current repo to a space by writing a
+small `.smriti.json` at the repo root:
+
+```json
+{
+  "space": "my-project",
+  "api_url": "http://localhost:8000",
+  "attached_at": "2026-05-19T01:00:00Z"
+}
+```
+
+Once a repo is attached, the `<space>` argument is **optional** on
+`state`, `current`, `metrics`, `checkpoint create/list`, `claim
+create/list`, and `worktree open/list`. The CLI walks up from the current
+directory, finds the nearest `.smriti.json`, and uses its space — so a
+session opened anywhere inside the repo stays connected without
+re-passing the space. An explicit `<space>` argument always overrides the
+attachment.
+
+`.smriti.json` is meant to be **committed**: the binding then travels with
+the repo, so a fresh clone, a teammate, or a second agent (Claude, Codex)
+opened in the project all attach to the same space automatically. Use
+different spaces for different repos and each repo stays bound to its own.
+
+`api_url` in the file is only a default — an explicit `--api-url` flag or
+`SMRITI_API_URL` always wins, so a committed file stays correct across
+machines.
+
+`smriti status` reports a repo's attachment, backend health, and open
+work — the quick day-two "am I still wired up?" check.
+
 ## MCP server
 
 Run Smriti as a local MCP server so agents inside Claude Code, Cursor, or Windsurf can read and write reasoning state natively — no subprocess-shelling to the `smriti` binary.
@@ -138,14 +171,16 @@ The installer is version-aware: it refuses to overwrite a destination whose inst
 ## Commands
 
 ```
-smriti init <space> [--description "..."]             # one-step agent onboarding
+smriti init <space> [--description "..."]             # one-step agent onboarding + attach repo
 smriti doctor                                          # backend/runtime diagnostics
+smriti status                                          # this repo's attachment, health, and open work
 smriti quickstart [--remove | --reset]                 # seed a demo space + guided walkthrough
 
 smriti space list
 smriti space create <name> [--description "..."]
 smriti space delete <space> [-y]
 
+# <space> is optional below once the repo is attached (see Project attachment).
 smriti state <space>                                     # multi-branch continuation brief (full artifacts by default)
 smriti state <space> --preview                           # truncate artifacts to a short preview
 smriti state <space> --main-only                         # legacy single-HEAD path (pre-V4 behaviour)
diff --git a/cli/smriti_cli/attachment.py b/cli/smriti_cli/attachment.py
new file mode 100644
index 0000000..4d2ce06
--- /dev/null
+++ b/cli/smriti_cli/attachment.py
@@ -0,0 +1,142 @@
+"""Project attachment — durable repo ↔ space binding.
+
+A project is "attached" to a Smriti space by a small `.smriti.json` file at
+the repo root. Once written, every Smriti command run anywhere inside that
+directory tree resolves its space from this file, so agents and humans no
+longer pass `<space>` explicitly on each call.
+
+The file is meant to be committed: the binding then travels with the repo,
+so a fresh clone, a teammate, or a second agent opened in the project all
+attach to the same space automatically.
+
+Schema (forward-compatible — unknown keys are preserved on rewrite):
+
+    {
+      "space": "smriti-dev",          # required: space name or UUID
+      "api_url": "http://localhost:8000",  # optional default backend URL
+      "attached_at": "2026-05-19T01:00:00Z"  # optional, informational
+    }
+
+`api_url` is only a default — an explicit `--api-url` flag or the
+`SMRITI_API_URL` environment variable always wins, so a committed file with
+a local-mode URL stays correct across machines.
+"""
+
+from __future__ import annotations
+
+import json
+import os
+from datetime import datetime, timezone
+from pathlib import Path
+from typing import Any
+
+ATTACHMENT_FILENAME = ".smriti.json"
+
+
+class AttachmentError(Exception):
+    """Raised when an attachment file exists but is malformed."""
+
+
+class Attachment:
+    """A parsed `.smriti.json` and the path it was read from."""
+
+    def __init__(self, path: Path, data: dict[str, Any]):
+        self.path = path
+        self.data = data
+
+    @property
+    def space(self) -> str | None:
+        value = self.data.get("space")
+        return value if isinstance(value, str) and value.strip() else None
+
+    @property
+    def api_url(self) -> str | None:
+        value = self.data.get("api_url")
+        return value if isinstance(value, str) and value.strip() else None
+
+    @property
+    def root(self) -> Path:
+        """The directory the project is attached from (where the file lives)."""
+        return self.path.parent
+
+
+def _candidate_dirs(start: Path) -> list[Path]:
+    """Return `start` and every ancestor, nearest first."""
+    start = start.resolve()
+    return [start, *start.parents]
+
+
+def find_attachment_file(start: str | os.PathLike[str] | None = None) -> Path | None:
+    """Walk up from `start` (default cwd) looking for `.smriti.json`.
+
+    Returns the path to the nearest attachment file, or None if none is
+    found between `start` and the filesystem root.
+    """
+    begin = Path(start) if start is not None else Path.cwd()
+    try:
+        dirs = _candidate_dirs(begin)
+    except OSError:
+        return None
+    for directory in dirs:
+        candidate = directory / ATTACHMENT_FILENAME
+        if candidate.is_file():
+            return candidate
+    return None
+
+
+def load_attachment(start: str | os.PathLike[str] | None = None) -> Attachment | None:
+    """Find and parse the nearest `.smriti.json`, or return None.
+
+    Raises AttachmentError if a file is found but cannot be parsed or lacks
+    a usable `space` — a corrupt binding should be loud, not silently
+    ignored, since every command would otherwise fall back to "no space".
+    """
+    path = find_attachment_file(start)
+    if path is None:
+        return None
+    try:
+        raw = json.loads(path.read_text(encoding="utf-8"))
+    except (ValueError, OSError) as e:
+        raise AttachmentError(f"Could not read attachment file {path}: {e}")
+    if not isinstance(raw, dict):
+        raise AttachmentError(
+            f"Attachment file {path} is not a JSON object."
+        )
+    attachment = Attachment(path, raw)
+    if attachment.space is None:
+        raise AttachmentError(
+            f"Attachment file {path} is missing a non-empty \"space\" field."
+        )
+    return attachment
+
+
+def write_attachment(
+    directory: str | os.PathLike[str],
+    space: str,
+    api_url: str | None = None,
+) -> Path:
+    """Write (or update) `.smriti.json` in `directory`, returning its path.
+
+    Existing unknown keys are preserved so a newer file written by a future
+    CLI version is not clobbered by an older one.
+    """
+    target_dir = Path(directory)
+    path = target_dir / ATTACHMENT_FILENAME
+
+    data: dict[str, Any] = {}
+    if path.is_file():
+        try:
+            existing = json.loads(path.read_text(encoding="utf-8"))
+            if isinstance(existing, dict):
+                data = existing
+        except (ValueError, OSError):
+            data = {}
+
+    data["space"] = space
+    if api_url:
+        data["api_url"] = api_url
+    data["attached_at"] = datetime.now(timezone.utc).strftime("%Y-%m-%dT%H:%M:%SZ")
+
+    target_dir.mkdir(parents=True, exist_ok=True)
+    path.write_text(json.dumps(data, indent=2) + "\n", encoding="utf-8")
+    return path
diff --git a/cli/smriti_cli/main.py b/cli/smriti_cli/main.py
index ec05803..7a25561 100644
--- a/cli/smriti_cli/main.py
+++ b/cli/smriti_cli/main.py
@@ -7,8 +7,9 @@ Commands for agent and programmatic use:
     smriti space set-project-root <space> <path>
     smriti space delete <space> [-y]
     smriti doctor
-    smriti state <space> [--preview]
-    smriti current <space>
+    smriti status
+    smriti state [<space>] [--preview]
+    smriti current [<space>]
     smriti fork <checkpoint-id> [--branch <name>]
     smriti restore <checkpoint-id>
     smriti compare <checkpoint-a> <checkpoint-b>
@@ -44,6 +45,12 @@ Every command supports --json for structured output.
 Default output is a readable markdown brief.
 
 SMRITI_API_URL env var sets the backend URL (default http://localhost:8000).
+
+`smriti init` attaches the repo to a space by writing `.smriti.json` at
+the repo root. Once attached, the `<space>` argument is optional on
+state/current/metrics/checkpoint/claim/worktree commands — it resolves
+from the nearest `.smriti.json` walking up from the working directory.
+`smriti status` reports the attachment, backend health, and open work.
 """
 
 from __future__ import annotations
@@ -59,6 +66,12 @@ from importlib import metadata
 from pathlib import Path
 from typing import Any
 
+from .attachment import (
+    ATTACHMENT_FILENAME,
+    AttachmentError,
+    load_attachment,
+    write_attachment,
+)
 from .client import SmritiClient, SmritiError
 from .formatters import (
     format_checkpoint,
@@ -178,6 +191,67 @@ def _build_cwd_info() -> dict:
     return info
 
 
+def _attach_root() -> str:
+    """Directory to anchor the project attachment file to.
+
+    Prefer the git repo root so `.smriti.json` lands beside the repo's other
+    project files and is found from any subdirectory. Fall back to the
+    current working directory when not inside a git repo.
+    """
+    return _git_output("rev-parse", "--show-toplevel") or os.getcwd()
+
+
+def _resolve_space_name(args: argparse.Namespace) -> str:
+    """Return the space for a command: explicit arg, else the attached space.
+
+    Commands that take an optional `<space>` positional call this. An
+    explicit argument always wins. Otherwise the project attachment
+    (`.smriti.json`, written by `smriti init`) supplies the space, so a
+    session opened anywhere in the repo stays bound to the right space
+    without re-passing it.
+    """
+    explicit = getattr(args, "space", None)
+    if explicit:
+        return explicit
+    try:
+        attachment = load_attachment()
+    except AttachmentError as e:
+        _fail(f"error: {e}")
+        raise SystemExit(1)  # unreachable; _fail exits
+    if attachment is not None:
+        space = attachment.space
+        if space:
+            return space
+    _fail(
+        f"error: no space given and no {ATTACHMENT_FILENAME} found in this "
+        "directory or any parent.\n"
+        "Attach this project once with `smriti init <space>`, then commands "
+        "resolve the space automatically. Or pass a space name explicitly."
+    )
+    raise SystemExit(1)  # unreachable; _fail exits
+
+
+def _resolve_api_url(args: argparse.Namespace) -> str | None:
+    """Pick the backend URL: explicit --api-url > $SMRITI_API_URL > attachment.
+
+    Returns None when nothing project-specific applies, letting SmritiClient
+    fall back to the env var or its built-in default. The attachment's
+    api_url is only a last-resort default, so a committed `.smriti.json`
+    never overrides a machine-specific flag or environment variable.
+    """
+    if getattr(args, "api_url", None):
+        return args.api_url
+    if os.environ.get("SMRITI_API_URL"):
+        return None
+    try:
+        attachment = load_attachment()
+    except AttachmentError:
+        return None
+    if attachment is not None and attachment.api_url:
+        return attachment.api_url
+    return None
+
+
 def _build_smriti_source_info() -> dict:
     """Detect the Smriti source checkout backing this CLI, if available.
 
@@ -282,14 +356,20 @@ def _smriti_mcp_executable() -> str:
     return path_entry or "smriti-mcp"
 
 
-def _build_session_start_hook_command(space_name: str, api_url: str | None = None) -> str:
+def _build_session_start_hook_command() -> str:
+    """Build the SessionStart hook command.
+
+    The command deliberately omits an explicit space: `smriti state
+    --compact` resolves the space from the project's `.smriti.json`
+    attachment. That keeps the hook byte-identical across every project and
+    stable when a project is re-attached to a different space — the binding
+    lives in one place (the attachment file), not duplicated into the hook
+    string.
+    """
     args = [shlex.quote(_smriti_hook_executable())]
-    if api_url:
-        args.extend(["--api-url", shlex.quote(api_url)])
     args.extend(
         [
             "state",
-            shlex.quote(space_name),
             "--compact",
             "2>/dev/null",
             "||",
@@ -299,10 +379,7 @@ def _build_session_start_hook_command(space_name: str, api_url: str | None = Non
             ),
         ]
     )
-    command = " ".join(
-        args
-    )
-    return command
+    return " ".join(args)
 
 
 def _is_smriti_session_start_entry(entry: Any) -> bool:
@@ -520,6 +597,103 @@ def cmd_doctor(client: SmritiClient, args: argparse.Namespace) -> None:
         print(format_doctor(report), end="")
 
 
+def cmd_status(client: SmritiClient, args: argparse.Namespace) -> None:
+    """Show how the current directory is connected to Smriti.
+
+    The day-two continuity check: which space this project is attached to,
+    whether the backend is reachable, and what work is open — answered
+    without having to remember or pass the space name.
+    """
+    try:
+        attachment = load_attachment()
+        attach_error: str | None = None
+    except AttachmentError as e:
+        attachment = None
+        attach_error = str(e)
+
+    space_name = attachment.space if attachment else None
+    report: dict[str, Any] = {
+        "attached": attachment is not None,
+        "attachment_file": str(attachment.path) if attachment else None,
+        "attach_error": attach_error,
+        "space": space_name,
+        "api_url": client.base_url,
+        "backend_reachable": False,
+        "space_resolved": None,
+        "active_claims": None,
+        "head_commit_id": None,
+    }
+
+    try:
+        client.get_health()
+        report["backend_reachable"] = True
+    except SmritiError:
+        report["backend_reachable"] = False
+
+    space_obj: dict | None = None
+    if report["backend_reachable"] and space_name:
+        try:
+            space_obj = client.resolve_space(space_name)
+        except SmritiError:
+            space_obj = None
+        if space_obj is not None:
+            report["space_resolved"] = {
+                "id": space_obj["id"],
+                "name": space_obj["name"],
+                "project_root": space_obj.get("project_root"),
+            }
+            try:
+                report["active_claims"] = client.list_claims(space_obj["id"])
+            except SmritiError:
+                report["active_claims"] = None
+            try:
+                head = client.get_head(space_obj["id"])
+                report["head_commit_id"] = head.get("commit_id")
+            except SmritiError:
+                report["head_commit_id"] = None
+
+    if args.json:
+        _print_json(report)
+        return
+
+    print()
+    if attachment is not None:
+        print(f'  Project attached to space "{space_name}"')
+        print(f"    via {attachment.path}")
+    elif attach_error:
+        print(f"  Attachment file is invalid: {attach_error}")
+    else:
+        print("  This project is not attached to a Smriti space.")
+        print("    Attach it once with:  smriti init <space>")
+    print()
+
+    state_word = "reachable" if report["backend_reachable"] else "NOT reachable"
+    print(f"  Backend: {state_word} at {client.base_url}")
+    if not report["backend_reachable"]:
+        print("    Start it with `make dev-local` (solo) or `make dev-postgres` (team).")
+    elif space_name and space_obj is None:
+        print(f'  Space "{space_name}" was not found on this backend.')
+        print("    Re-attach with `smriti init <space>` or check the backend.")
+    elif space_obj is not None:
+        print(f"  Space id: {space_obj['id']}")
+        print(f"  Space project_root: {space_obj.get('project_root') or '(not set)'}")
+        claims = report["active_claims"] or []
+        print(f"  Active claims: {len(claims)}")
+        for c in claims:
+            print(
+                f"    - [{c.get('intent_type', '?')}] {c.get('scope', '?')} "
+                f"({c.get('agent', '?')})"
+            )
+        print(
+            f"  HEAD checkpoint: {report['head_commit_id']}"
+            if report["head_commit_id"]
+            else "  HEAD checkpoint: none yet"
+        )
+        print()
+        print("  Continue:  smriti state   ·   smriti current")
+    print()
+
+
 def cmd_space_list(client: SmritiClient, args: argparse.Namespace) -> None:
     spaces = client.list_spaces()
     if args.json:
@@ -597,7 +771,7 @@ def cmd_state(client: SmritiClient, args: argparse.Namespace) -> None:
     and produces main-branch-only output. Useful for scripts that parsed
     the old shape or for debugging the endpoint in isolation.
     """
-    space = client.resolve_space(args.space)
+    space = client.resolve_space(_resolve_space_name(args))
 
     if args.main_only:
         # Legacy path — main branch HEAD only. Two round trips.
@@ -819,7 +993,7 @@ def _build_current_payload_from_existing(client: SmritiClient, space: dict) -> d
 
 def cmd_current(client: SmritiClient, args: argparse.Namespace) -> None:
     """Print the compact Project Current State surface for a space."""
-    space = client.resolve_space(args.space)
+    space = client.resolve_space(_resolve_space_name(args))
     try:
         data = client.get_current_state(space["id"])
     except SmritiError as e:
@@ -834,7 +1008,7 @@ def cmd_current(client: SmritiClient, args: argparse.Namespace) -> None:
 
 
 def cmd_checkpoint_create(client: SmritiClient, args: argparse.Namespace) -> None:
-    space = client.resolve_space(args.space)
+    space = client.resolve_space(_resolve_space_name(args))
 
     if args.extract and args.from_json:
         _fail("--extract and --from-json are mutually exclusive.")
@@ -939,7 +1113,7 @@ def cmd_checkpoint_show(client: SmritiClient, args: argparse.Namespace) -> None:
 
 
 def cmd_checkpoint_list(client: SmritiClient, args: argparse.Namespace) -> None:
-    space = client.resolve_space(args.space)
+    space = client.resolve_space(_resolve_space_name(args))
     commits = client.list_commits(space["id"], branch=args.branch)
     if args.json:
         _print_json(commits)
@@ -1176,17 +1350,39 @@ def cmd_init(client: SmritiClient, args: argparse.Namespace) -> None:
         )
         return
 
-    # 2. Create or connect space.
+    # 2. Create or connect space, bound to this project checkout.
+    attach_root = _attach_root()
     try:
         space = client.resolve_space(space_name)
         results.append(f'Space "{space_name}" exists (id: {space["id"][:8]}…)')
+        if not space.get("project_root"):
+            try:
+                space = client.set_project_root(space["id"], attach_root)
+                results.append(f"Bound space project_root → {attach_root}")
+            except SmritiError:
+                pass
     except Exception:
         space = client.create_space(
             name=space_name,
             description=args.description or "",
+            project_root=attach_root,
         )
         results.append(f'Space "{space_name}" created (id: {space["id"][:8]}…)')
 
+    # 2b. Write the local project attachment. Every Smriti command run
+    #     anywhere in this repo now resolves the space from this file, so
+    #     sessions stay connected without re-passing <space>.
+    attachment_path = write_attachment(attach_root, space_name, client.base_url)
+    try:
+        attachment_display = attachment_path.relative_to(Path.cwd())
+    except ValueError:
+        attachment_display = attachment_path
+    results.append(f'Project attached to "{space_name}" → {attachment_display}')
+    next_steps.append(
+        f"Commit {ATTACHMENT_FILENAME} so the attachment travels with the repo:\n"
+        f"    git add {ATTACHMENT_FILENAME} && git commit -m \"Attach project to Smriti space\""
+    )
+
     # 3. Install Claude Code skill pack.
     claude_result = install_skill("claude-code")
     if claude_result.action == "created":
@@ -1205,7 +1401,7 @@ def cmd_init(client: SmritiClient, args: argparse.Namespace) -> None:
             # Non-Smriti content exists — do not overwrite.
             codex_safe = False
             results.append(
-                f"Skipped Codex skill pack — AGENTS.md has existing non-Smriti content"
+                "Skipped Codex skill pack — AGENTS.md has existing non-Smriti content"
             )
             next_steps.append(
                 "Install Codex skill pack manually (will overwrite AGENTS.md):\n"
@@ -1231,7 +1427,7 @@ def cmd_init(client: SmritiClient, args: argparse.Namespace) -> None:
 
     # 5. Generate SessionStart hook.
     settings_path = Path(".claude/settings.json")
-    hook_command = _build_session_start_hook_command(space_name, client.base_url)
+    hook_command = _build_session_start_hook_command()
     hook_entry = {
         "type": "command",
         "command": hook_command,
@@ -1289,8 +1485,9 @@ def cmd_init(client: SmritiClient, args: argparse.Namespace) -> None:
     )
     next_steps.append(
         "Verify activation:\n"
-        "    smriti doctor\n"
-        f"    smriti state {space_name} --compact"
+        "    smriti doctor      backend/runtime health\n"
+        "    smriti status      this project's attachment and open work\n"
+        "    smriti state       continuation brief (space resolved from attachment)"
     )
 
     # 7. Output.
@@ -1448,7 +1645,7 @@ def cmd_quickstart(client: SmritiClient, args: argparse.Namespace) -> None:
 
 def cmd_branch_close(client: SmritiClient, args: argparse.Namespace) -> None:
     """Set the disposition of a branch (integrated, abandoned, or active)."""
-    space = client.resolve_space(args.space)
+    space = client.resolve_space(_resolve_space_name(args))
     result = client.close_branch(space["id"], args.branch_name, args.disposition)
     if args.json:
         _print_json(result)
@@ -1464,7 +1661,7 @@ def cmd_branch_close(client: SmritiClient, args: argparse.Namespace) -> None:
 
 def cmd_claim_create(client: SmritiClient, args: argparse.Namespace) -> None:
     """Create a work claim — declare intent before starting work."""
-    space = client.resolve_space(args.space)
+    space = client.resolve_space(_resolve_space_name(args))
     head = client.get_head(space["id"])
     base_commit_id = head.get("commit_id")  # auto-bind to current HEAD
 
@@ -1509,7 +1706,7 @@ def cmd_claim_abandon(client: SmritiClient, args: argparse.Namespace) -> None:
 
 def cmd_claim_list(client: SmritiClient, args: argparse.Namespace) -> None:
     """List active claims for a space."""
-    space = client.resolve_space(args.space)
+    space = client.resolve_space(_resolve_space_name(args))
     claims = client.list_claims(space["id"], include_expired=args.all)
     if args.json:
         _print_json(claims)
@@ -1566,7 +1763,7 @@ def _print_worktree_table(worktrees: list[dict]) -> None:
 
 def cmd_worktree_open(client: SmritiClient, args: argparse.Namespace) -> None:
     """Create a git worktree for an agent and print its path."""
-    space = client.resolve_space(args.space)
+    space = client.resolve_space(_resolve_space_name(args))
     worktree = client.create_worktree(
         space_id=space["id"],
         agent=args.agent,
@@ -1582,7 +1779,7 @@ def cmd_worktree_open(client: SmritiClient, args: argparse.Namespace) -> None:
 
 def cmd_worktree_list(client: SmritiClient, args: argparse.Namespace) -> None:
     """List worktrees for a space."""
-    space = client.resolve_space(args.space)
+    space = client.resolve_space(_resolve_space_name(args))
     worktrees = client.list_worktrees(space["id"], include_closed=args.include_closed)
     if args.json:
         _print_json(worktrees)
@@ -1637,7 +1834,7 @@ def cmd_restore(client: SmritiClient, args: argparse.Namespace) -> None:
 
 def cmd_metrics(client: SmritiClient, args: argparse.Namespace) -> None:
     """Print project-level KPIs for a space."""
-    space = client.resolve_space(args.space)
+    space = client.resolve_space(_resolve_space_name(args))
     data = client.get_space_metrics(space["id"])
     if args.json:
         _print_json(data)
@@ -1678,6 +1875,16 @@ def _build_parser() -> argparse.ArgumentParser:
     doctor_parser.add_argument("--json", action="store_true", help="Output structured JSON")
     doctor_parser.set_defaults(func=cmd_doctor)
 
+    # status — project attachment + day-two continuity check
+    status_parser = subparsers.add_parser(
+        "status",
+        help="Show this project's Smriti attachment, backend health, and open work",
+    )
+    status_parser.add_argument(
+        "--json", action="store_true", help="Output structured JSON"
+    )
+    status_parser.set_defaults(func=cmd_status)
+
     # quickstart — seed a curated demo space so the product clicks fast
     quickstart_parser = subparsers.add_parser(
         "quickstart",
@@ -1764,7 +1971,12 @@ def _build_parser() -> argparse.ArgumentParser:
         "state",
         help="Print a continuation-oriented brief of the current project state",
     )
-    state_parser.add_argument("space", help="Space name or UUID")
+    state_parser.add_argument(
+        "space",
+        nargs="?",
+        default=None,
+        help="Space name or UUID (optional when the project is attached via .smriti.json)",
+    )
     state_parser.add_argument(
         "--preview",
         action="store_true",
@@ -1813,7 +2025,12 @@ def _build_parser() -> argparse.ArgumentParser:
         "current",
         help="Print the compact Project Current State surface for a space",
     )
-    current_parser.add_argument("space", help="Space name or UUID")
+    current_parser.add_argument(
+        "space",
+        nargs="?",
+        default=None,
+        help="Space name or UUID (optional when the project is attached via .smriti.json)",
+    )
     current_parser.add_argument("--json", action="store_true", help="Output structured JSON")
     current_parser.set_defaults(func=cmd_current)
 
@@ -1825,7 +2042,12 @@ def _build_parser() -> argparse.ArgumentParser:
         "create",
         help="Create a checkpoint from JSON on stdin or --from-json <path>",
     )
-    cp_create.add_argument("space", help="Space name or UUID")
+    cp_create.add_argument(
+        "space",
+        nargs="?",
+        default=None,
+        help="Space name or UUID (optional when the project is attached via .smriti.json)",
+    )
     cp_create.add_argument(
         "--from-json",
         help="Path to a JSON file with the checkpoint payload (use '-' for stdin)",
@@ -1884,7 +2106,12 @@ def _build_parser() -> argparse.ArgumentParser:
     cp_show.set_defaults(func=cmd_checkpoint_show)
 
     cp_list = cp_sub.add_parser("list", help="List checkpoints in a space")
-    cp_list.add_argument("space", help="Space name or UUID")
+    cp_list.add_argument(
+        "space",
+        nargs="?",
+        default=None,
+        help="Space name or UUID (optional when the project is attached via .smriti.json)",
+    )
     cp_list.add_argument("--branch", help="Filter by branch name")
     cp_list.add_argument("--json", action="store_true", help="Output structured JSON")
     cp_list.set_defaults(func=cmd_checkpoint_list)
@@ -2005,7 +2232,12 @@ def _build_parser() -> argparse.ArgumentParser:
     claim_sub = claim_parser.add_subparsers(dest="subcommand", required=True)
 
     cl_create = claim_sub.add_parser("create", help="Declare intent before starting work")
-    cl_create.add_argument("space", help="Space name or UUID")
+    cl_create.add_argument(
+        "space",
+        nargs="?",
+        default=None,
+        help="Space name or UUID (optional when the project is attached via .smriti.json)",
+    )
     cl_create.add_argument("--agent", required=True, help="Your agent identifier (e.g. claude-code)")
     cl_create.add_argument("--scope", required=True, help="One sentence describing what you are about to work on")
     cl_create.add_argument("--branch", help="Branch name (default: main)", default=None)
@@ -2031,7 +2263,12 @@ def _build_parser() -> argparse.ArgumentParser:
     cl_abandon.set_defaults(func=cmd_claim_abandon)
 
     cl_list = claim_sub.add_parser("list", help="List active claims for a space")
-    cl_list.add_argument("space", help="Space name or UUID")
+    cl_list.add_argument(
+        "space",
+        nargs="?",
+        default=None,
+        help="Space name or UUID (optional when the project is attached via .smriti.json)",
+    )
     cl_list.add_argument("--all", action="store_true", help="Include expired/done/abandoned claims")
     cl_list.add_argument("--json", action="store_true")
     cl_list.set_defaults(func=cmd_claim_list)
@@ -2044,7 +2281,12 @@ def _build_parser() -> argparse.ArgumentParser:
     worktree_sub = worktree_parser.add_subparsers(dest="subcommand", required=True)
 
     wt_open = worktree_sub.add_parser("open", help="Create a worktree for an agent")
-    wt_open.add_argument("space", help="Space name or UUID")
+    wt_open.add_argument(
+        "space",
+        nargs="?",
+        default=None,
+        help="Space name or UUID (optional when the project is attached via .smriti.json)",
+    )
     wt_open.add_argument("--agent", required=True, help="Agent identifier (e.g. claude-code)")
     wt_open.add_argument("--branch", help="Branch name for the new worktree", default=None)
     wt_open.add_argument("--base-commit", dest="base_commit", help="Git SHA to base the worktree on", default=None)
@@ -2061,7 +2303,12 @@ def _build_parser() -> argparse.ArgumentParser:
             "behind, 0 when even, or — when unknown."
         ),
     )
-    wt_list.add_argument("space", help="Space name or UUID")
+    wt_list.add_argument(
+        "space",
+        nargs="?",
+        default=None,
+        help="Space name or UUID (optional when the project is attached via .smriti.json)",
+    )
     wt_list.add_argument("--include-closed", action="store_true", help="Include closed worktrees")
     wt_list.add_argument("--json", action="store_true")
     wt_list.set_defaults(func=cmd_worktree_list)
@@ -2137,7 +2384,12 @@ def _build_parser() -> argparse.ArgumentParser:
 
     # ── metrics ────────────────────────────────────────────────────────
     metrics_parser = subparsers.add_parser("metrics", help="Project-level KPIs for a space")
-    metrics_parser.add_argument("space", help="Space name or UUID")
+    metrics_parser.add_argument(
+        "space",
+        nargs="?",
+        default=None,
+        help="Space name or UUID (optional when the project is attached via .smriti.json)",
+    )
     metrics_parser.add_argument("--json", action="store_true", help="Output raw JSON")
     metrics_parser.set_defaults(func=cmd_metrics)
 
@@ -2148,7 +2400,7 @@ def main(argv: list[str] | None = None) -> int:
     parser = _build_parser()
     args = parser.parse_args(argv)
 
-    client = SmritiClient(base_url=args.api_url)
+    client = SmritiClient(base_url=_resolve_api_url(args))
 
     try:
         args.func(client, args)
diff --git a/cli/tests/test_attachment.py b/cli/tests/test_attachment.py
new file mode 100644
index 0000000..05438f0
--- /dev/null
+++ b/cli/tests/test_attachment.py
@@ -0,0 +1,255 @@
+"""Tests for project attachment — the durable repo ↔ space binding.
+
+Covers:
+- The attachment module: find / load / write `.smriti.json`
+- CLI space resolution: explicit arg vs. attachment fallback
+- CLI api_url resolution precedence
+- `smriti status` output, attached and unattached
+- `<space>` is optional on the parser for attachment-aware commands
+"""
+from __future__ import annotations
+
+import argparse
+import json
+from unittest.mock import MagicMock
+
+import pytest
+
+from smriti_cli import attachment
+from smriti_cli import main as cli_main
+from smriti_cli.attachment import (
+    Attachment,
+    AttachmentError,
+    find_attachment_file,
+    load_attachment,
+    write_attachment,
+)
+from smriti_cli.client import SmritiClient, SmritiError
+
+
+# ── attachment module ───────────────────────────────────────────────────────
+
+
+def test_write_then_load_roundtrip(tmp_path):
+    write_attachment(tmp_path, "my-space", api_url="http://localhost:8000")
+    loaded = load_attachment(tmp_path)
+    assert loaded is not None
+    assert loaded.space == "my-space"
+    assert loaded.api_url == "http://localhost:8000"
+    assert loaded.root == tmp_path.resolve()
+
+
+def test_write_attachment_records_timestamp(tmp_path):
+    path = write_attachment(tmp_path, "s")
+    data = json.loads(path.read_text())
+    assert "attached_at" in data
+    assert data["attached_at"].endswith("Z")
+
+
+def test_write_attachment_preserves_unknown_keys(tmp_path):
+    path = tmp_path / attachment.ATTACHMENT_FILENAME
+    path.write_text(json.dumps({"space": "old", "future_key": "keep-me"}))
+    write_attachment(tmp_path, "new-space")
+    data = json.loads(path.read_text())
+    assert data["space"] == "new-space"
+    assert data["future_key"] == "keep-me"
+
+
+def test_find_attachment_walks_up_to_parent(tmp_path):
+    write_attachment(tmp_path, "root-space")
+    nested = tmp_path / "a" / "b" / "c"
+    nested.mkdir(parents=True)
+    found = find_attachment_file(nested)
+    assert found == (tmp_path / attachment.ATTACHMENT_FILENAME)
+
+
+def test_find_attachment_returns_none_when_absent(tmp_path):
+    assert find_attachment_file(tmp_path) is None
+
+
+def test_load_attachment_returns_none_when_absent(tmp_path):
+    assert load_attachment(tmp_path) is None
+
+
+def test_load_attachment_rejects_malformed_json(tmp_path):
+    (tmp_path / attachment.ATTACHMENT_FILENAME).write_text("{not json")
+    with pytest.raises(AttachmentError):
+        load_attachment(tmp_path)
+
+
+def test_load_attachment_rejects_missing_space(tmp_path):
+    (tmp_path / attachment.ATTACHMENT_FILENAME).write_text(json.dumps({"api_url": "x"}))
+    with pytest.raises(AttachmentError):
+        load_attachment(tmp_path)
+
+
+def test_load_attachment_rejects_non_object(tmp_path):
+    (tmp_path / attachment.ATTACHMENT_FILENAME).write_text(json.dumps(["not", "a", "dict"]))
+    with pytest.raises(AttachmentError):
+        load_attachment(tmp_path)
+
+
+def test_attachment_blank_space_is_treated_as_missing(tmp_path):
+    att = Attachment(tmp_path / ".smriti.json", {"space": "   "})
+    assert att.space is None
+
+
+# ── CLI space resolution ────────────────────────────────────────────────────
+
+
+def test_resolve_space_name_prefers_explicit_arg(tmp_path, monkeypatch):
+    monkeypatch.chdir(tmp_path)
+    write_attachment(tmp_path, "attached-space")
+    args = argparse.Namespace(space="explicit-space")
+    assert cli_main._resolve_space_name(args) == "explicit-space"
+
+
+def test_resolve_space_name_falls_back_to_attachment(tmp_path, monkeypatch):
+    monkeypatch.chdir(tmp_path)
+    write_attachment(tmp_path, "attached-space")
+    args = argparse.Namespace(space=None)
+    assert cli_main._resolve_space_name(args) == "attached-space"
+
+
+def test_resolve_space_name_fails_without_arg_or_attachment(tmp_path, monkeypatch):
+    monkeypatch.chdir(tmp_path)
+    args = argparse.Namespace(space=None)
+    with pytest.raises(SystemExit):
+        cli_main._resolve_space_name(args)
+
+
+def test_resolve_space_name_fails_loudly_on_corrupt_attachment(tmp_path, monkeypatch):
+    monkeypatch.chdir(tmp_path)
+    (tmp_path / attachment.ATTACHMENT_FILENAME).write_text("{broken")
+    args = argparse.Namespace(space=None)
+    with pytest.raises(SystemExit):
+        cli_main._resolve_space_name(args)
+
+
+# ── CLI api_url resolution ──────────────────────────────────────────────────
+
+
+def test_resolve_api_url_prefers_explicit_flag(tmp_path, monkeypatch):
+    monkeypatch.chdir(tmp_path)
+    monkeypatch.delenv("SMRITI_API_URL", raising=False)
+    write_attachment(tmp_path, "s", api_url="http://attachment:9000")
+    args = argparse.Namespace(api_url="http://flag:1234")
+    assert cli_main._resolve_api_url(args) == "http://flag:1234"
+
+
+def test_resolve_api_url_defers_to_env_var(tmp_path, monkeypatch):
+    monkeypatch.chdir(tmp_path)
+    monkeypatch.setenv("SMRITI_API_URL", "http://env:5555")
+    write_attachment(tmp_path, "s", api_url="http://attachment:9000")
+    args = argparse.Namespace(api_url=None)
+    # Returns None so SmritiClient itself reads the env var.
+    assert cli_main._resolve_api_url(args) is None
+
+
+def test_resolve_api_url_falls_back_to_attachment(tmp_path, monkeypatch):
+    monkeypatch.chdir(tmp_path)
+    monkeypatch.delenv("SMRITI_API_URL", raising=False)
+    write_attachment(tmp_path, "s", api_url="http://attachment:9000")
+    args = argparse.Namespace(api_url=None)
+    assert cli_main._resolve_api_url(args) == "http://attachment:9000"
+
+
+def test_resolve_api_url_none_when_nothing_set(tmp_path, monkeypatch):
+    monkeypatch.chdir(tmp_path)
+    monkeypatch.delenv("SMRITI_API_URL", raising=False)
+    args = argparse.Namespace(api_url=None)
+    assert cli_main._resolve_api_url(args) is None
+
+
+# ── parser: <space> is optional for attachment-aware commands ────────────────
+
+
+@pytest.mark.parametrize(
+    "argv",
+    [
+        ["state"],
+        ["current"],
+        ["claim", "list"],
+        ["worktree", "list"],
+        ["metrics"],
+        ["checkpoint", "list"],
+    ],
+)
+def test_space_positional_is_optional(argv):
+    args = cli_main._build_parser().parse_args(argv)
+    assert args.space is None
+
+
+def test_space_positional_still_accepts_explicit_value():
+    args = cli_main._build_parser().parse_args(["state", "my-space"])
+    assert args.space == "my-space"
+
+
+# ── smriti status ───────────────────────────────────────────────────────────
+
+
+def _status_client(reachable=True):
+    client = MagicMock(spec=SmritiClient)
+    client.base_url = "http://localhost:8000"
+    if reachable:
+        client.get_health.return_value = {"status": "ok"}
+    else:
+        client.get_health.side_effect = SmritiError("unreachable")
+    return client
+
+
+def test_status_unattached(tmp_path, monkeypatch, capsys):
+    monkeypatch.chdir(tmp_path)
+    client = _status_client()
+    args = argparse.Namespace(json=True)
+    cli_main.cmd_status(client, args)
+    report = json.loads(capsys.readouterr().out)
+    assert report["attached"] is False
+    assert report["space"] is None
+    assert report["backend_reachable"] is True
+
+
+def test_status_attached_reports_space_and_claims(tmp_path, monkeypatch, capsys):
+    monkeypatch.chdir(tmp_path)
+    write_attachment(tmp_path, "bound-space")
+    client = _status_client()
+    client.resolve_space.return_value = {
+        "id": "space-uuid",
+        "name": "bound-space",
+        "project_root": str(tmp_path),
+    }
+    client.list_claims.return_value = [
+        {"intent_type": "implement", "scope": "do a thing", "agent": "claude-code"}
+    ]
+    client.get_head.return_value = {"commit_id": "commit-1"}
+    args = argparse.Namespace(json=True)
+    cli_main.cmd_status(client, args)
+    report = json.loads(capsys.readouterr().out)
+    assert report["attached"] is True
+    assert report["space"] == "bound-space"
+    assert report["space_resolved"]["id"] == "space-uuid"
+    assert len(report["active_claims"]) == 1
+    assert report["head_commit_id"] == "commit-1"
+
+
+def test_status_attached_but_backend_down(tmp_path, monkeypatch, capsys):
+    monkeypatch.chdir(tmp_path)
+    write_attachment(tmp_path, "bound-space")
+    client = _status_client(reachable=False)
+    args = argparse.Namespace(json=True)
+    cli_main.cmd_status(client, args)
+    report = json.loads(capsys.readouterr().out)
+    assert report["attached"] is True
+    assert report["backend_reachable"] is False
+    assert report["space_resolved"] is None
+
+
+def test_status_corrupt_attachment_is_reported(tmp_path, monkeypatch, capsys):
+    monkeypatch.chdir(tmp_path)
+    (tmp_path / attachment.ATTACHMENT_FILENAME).write_text("{broken")
+    client = _status_client()
+    args = argparse.Namespace(json=True)
+    cli_main.cmd_status(client, args)
+    report = json.loads(capsys.readouterr().out)
+    assert report["attached"] is False
+    assert report["attach_error"] is not None
diff --git a/cli/tests/test_init.py b/cli/tests/test_init.py
index f344069..cfaa167 100644
--- a/cli/tests/test_init.py
+++ b/cli/tests/test_init.py
@@ -48,22 +48,23 @@ def test_init_parser_wiring():
     assert args.func is cli_main.cmd_init
 
 
-def test_session_start_hook_command_shell_quotes(monkeypatch):
+def test_session_start_hook_command_resolves_space_from_attachment(monkeypatch):
     monkeypatch.setattr(
         cli_main,
         "_smriti_hook_executable",
         lambda: "/Applications/Smriti Tools/bin/smriti",
     )
 
-    command = cli_main._build_session_start_hook_command(
-        "my project",
-        "http://localhost:8000",
-    )
+    command = cli_main._build_session_start_hook_command()
 
+    # No explicit space and no --api-url: the hook resolves both from the
+    # project's .smriti.json attachment, so it is byte-identical across
+    # every project and survives re-attachment to a different space.
     assert command.startswith(
-        "'/Applications/Smriti Tools/bin/smriti' --api-url "
-        "http://localhost:8000 state 'my project' --compact"
+        "'/Applications/Smriti Tools/bin/smriti' state --compact"
     )
+    assert " state " in command  # the smriti-hook detector relies on this
+    assert "--api-url" not in command
     assert "backend/.venv/bin/smriti" not in command
 
 
@@ -87,6 +88,7 @@ def test_smriti_session_start_detector_handles_quoted_executable():
 def test_init_creates_space_and_skill_packs(mock_client, tmp_path, monkeypatch):
     """Init with a fresh project: creates space, installs both skill packs."""
     monkeypatch.chdir(tmp_path)
+    monkeypatch.setattr(cli_main, "_attach_root", lambda: str(tmp_path))
 
     # Space doesn't exist — resolve fails, create succeeds
     from smriti_cli.client import SmritiError
@@ -100,8 +102,14 @@ def test_init_creates_space_and_skill_packs(mock_client, tmp_path, monkeypatch):
     args.api_url = None
     cli_main.cmd_init(mock_client, args)
 
-    # Space was created
-    mock_client.create_space.assert_called_once_with(name="test-project", description="")
+    # Space was created, bound to the project checkout
+    mock_client.create_space.assert_called_once_with(
+        name="test-project", description="", project_root=str(tmp_path)
+    )
+
+    # Project attachment file was written
+    attachment = json.loads((tmp_path / ".smriti.json").read_text())
+    assert attachment["space"] == "test-project"
 
     # Claude skill pack was installed
     assert (tmp_path / ".claude" / "skills" / "smriti" / "SKILL.md").exists()
@@ -110,14 +118,11 @@ def test_init_creates_space_and_skill_packs(mock_client, tmp_path, monkeypatch):
     assert (tmp_path / "AGENTS.md").exists()
     assert "smriti_skill_pack_version" in (tmp_path / "AGENTS.md").read_text()
 
-    # SessionStart hook was generated
+    # SessionStart hook was generated — space-less, resolves from attachment
     settings = json.loads((tmp_path / ".claude" / "settings.json").read_text())
     assert "SessionStart" in settings.get("hooks", {})
     command = settings["hooks"]["SessionStart"][0]["hooks"][0]["command"]
-    assert command.startswith(
-        "/opt/smriti/bin/smriti --api-url "
-        "http://localhost:8000 state test-project --compact"
-    )
+    assert command.startswith("/opt/smriti/bin/smriti state --compact")
     assert "backend/.venv/bin/smriti" not in command
     assert "--preview" not in command
 
@@ -238,13 +243,12 @@ def test_init_updates_stale_smriti_session_start_hook(
     ]
     assert len(commands) == 3
     assert all(
-        command.startswith(
-            "/opt/smriti/bin/smriti --api-url http://localhost:8000 state p --compact"
-        )
+        command.startswith("/opt/smriti/bin/smriti state --compact")
         for command in commands
     )
     assert all("backend/.venv/bin/smriti" not in command for command in commands)
     assert all("--preview" not in command for command in commands)
+    assert all(" p " not in command for command in commands)
 
 
 def test_init_preserves_unrelated_session_start_hooks(
@@ -273,16 +277,21 @@ def test_init_preserves_unrelated_session_start_hooks(
     assert len(entries) == 4
     assert any(
         entry["hooks"][0]["command"].startswith(
-            "/opt/smriti/bin/smriti --api-url http://localhost:8000 state p --compact"
+            "/opt/smriti/bin/smriti state --compact"
         )
         for entry in entries[1:]
     )
 
 
-def test_init_json_preserves_api_url_for_hooks_and_mcp(
+def test_init_json_preserves_api_url_for_attachment_and_mcp(
     mock_client, tmp_path, monkeypatch, capsys
 ):
-    """Custom backend URLs should survive generated hooks and MCP hints."""
+    """Custom backend URLs should survive into the attachment and MCP hint.
+
+    The SessionStart hook no longer carries --api-url — the URL lives in
+    `.smriti.json` instead, and the CLI resolves it from there. This keeps
+    the hook identical across projects while still honouring a custom URL.
+    """
     monkeypatch.chdir(tmp_path)
     mock_client.base_url = "http://127.0.0.1:8999"
     mock_client.resolve_space.return_value = {"id": "uuid", "name": "p"}
@@ -299,8 +308,11 @@ def test_init_json_preserves_api_url_for_hooks_and_mcp(
     payload = json.loads(capsys.readouterr().out)
     settings = json.loads((tmp_path / ".claude" / "settings.json").read_text())
     command = settings["hooks"]["SessionStart"][0]["hooks"][0]["command"]
+    attachment = json.loads((tmp_path / ".smriti.json").read_text())
 
-    assert "--api-url http://127.0.0.1:8999" in command
+    # The hook is space-less and URL-less; the URL lives in the attachment.
+    assert "--api-url" not in command
+    assert attachment["api_url"] == "http://127.0.0.1:8999"
     assert any("/opt/smriti/bin/smriti-mcp" in step for step in payload["next_steps"])
     assert any("http://127.0.0.1:8999" in step for step in payload["next_steps"])