feat: discover Claude Code project .mcp.json configs as profiles (#53)

Closes #53

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

bcc_core.py

@@ -282,10 +282,43 @@ def msix_warning_text(
     )
 
 
+def discover_project_configs(claude_json_path: str | os.PathLike) -> list[Profile]:
+    """
+    Find project-scope `.mcp.json` configs known to Claude Code.
+
+    `~/.claude.json` keeps a `projects` map keyed by absolute project
+    directory path (that's what the CLI writes as it's used in each repo).
+    Any project whose directory has a `.mcp.json` file next to it -- a
+    standalone file with a top-level `mcpServers` object, same shape BCC
+    already edits -- is surfaced here as its own profile so it can be opened
+    via 'Add config...' without hunting for the path by hand.
+
+    Fails quiet: a missing/unreadable/malformed `claude_json_path`, or a
+    `projects` value that isn't a dict, just yields an empty list rather than
+    raising -- this is best-effort discovery, not a required config load.
+    """
+    try:
+        cfg = load_config(claude_json_path)
+    except Exception:
+        return []
+    projects = cfg.get("projects")
+    if not isinstance(projects, dict):
+        return []
+    out: list[Profile] = []
+    for key in sorted(k for k in projects if isinstance(k, str)):
+        mcp_path = Path(key) / ".mcp.json"
+        if mcp_path.is_file():
+            out.append(
+                Profile(label=f"Project: {Path(key).name}", path=mcp_path, config_exists=True)
+            )
+    return out
+
+
 def discover_profiles() -> list[Profile]:
     """
     Find every `Claude*` data directory in the platform's app-support base
-    (Claude Desktop installs), then also check for a Claude Code global config.
+    (Claude Desktop installs), then also check for a Claude Code global config
+    and any project-scope `.mcp.json` configs it knows about.
 
     Claude Desktop: scans the platform app-support folder for any `Claude*`
     directory (catches `Claude`, `Claude-Work`, etc.).
@@ -298,6 +331,10 @@ def discover_profiles() -> list[Profile]:
     `claude mcp add` writes; project scope is a per-repo .mcp.json, which can
     be opened via 'Add config…'). NOT ~/.claude/settings.json — that file is
     for permissions/hooks and rejects an mcpServers key with a schema error.
+    Project scope: ~/.claude.json also tracks a `projects` map, one entry per
+    directory Claude Code has been run in; any of those with a `.mcp.json`
+    file are surfaced as their own profiles too (see
+    `discover_project_configs`).
     """
     base = app_support_base()
     out: list[Profile] = []
@@ -319,6 +356,12 @@ def discover_profiles() -> list[Profile]:
     cc_cfg = home / ".claude.json"
     out.append(Profile(label="Claude Code", path=cc_cfg, config_exists=cc_cfg.is_file()))
 
+    existing_paths = {str(p.path) for p in out}
+    for proj in discover_project_configs(cc_cfg):
+        if str(proj.path) not in existing_paths:
+            existing_paths.add(str(proj.path))
+            out.append(proj)
+
     # Legacy: earlier BCC versions (and hand-edits) may have parked servers in
     # ~/.claude/settings.json, where Claude Code ignores them. Surface that
     # file only when it actually contains an mcpServers block, so the user can

tests/test_core.py

@@ -67,6 +67,64 @@ def test_legacy_settings_json_surfaced_only_with_servers(fake_home):
     assert any("legacy" in p.label for p in c.discover_profiles())
 
 
+def test_project_with_mcp_json_is_discovered(tmp_path):
+    proj = tmp_path / "my-project"
+    proj.mkdir()
+    (proj / ".mcp.json").write_text('{"mcpServers": {"x": {"command": "npx"}}}')
+    claude_json = tmp_path / ".claude.json"
+    claude_json.write_text(json.dumps({"projects": {str(proj): {}}}))
+
+    profs = c.discover_project_configs(claude_json)
+    assert len(profs) == 1
+    assert profs[0].label == f"Project: {proj.name}"
+    assert profs[0].path == proj / ".mcp.json"
+    assert profs[0].config_exists
+
+
+def test_project_without_mcp_json_not_listed(tmp_path):
+    proj = tmp_path / "no-mcp-project"
+    proj.mkdir()
+    claude_json = tmp_path / ".claude.json"
+    claude_json.write_text(json.dumps({"projects": {str(proj): {}}}))
+
+    assert c.discover_project_configs(claude_json) == []
+
+
+def test_projects_missing_or_not_dict_yields_no_profiles(tmp_path):
+    claude_json = tmp_path / ".claude.json"
+
+    claude_json.write_text(json.dumps({}))
+    assert c.discover_project_configs(claude_json) == []
+
+    claude_json.write_text(json.dumps({"projects": ["not", "a", "dict"]}))
+    assert c.discover_project_configs(claude_json) == []
+
+
+def test_malformed_claude_json_fails_quiet(fake_home):
+    (fake_home / ".claude.json").write_text("{not valid json")
+    assert c.discover_project_configs(fake_home / ".claude.json") == []
+    # discover_profiles as a whole must still work and just skip project profiles
+    profs = c.discover_profiles()
+    assert not any(p.label.startswith("Project:") for p in profs)
+
+
+def test_project_configs_deduped_against_existing_profiles(fake_home):
+    # Point a project directly at the Claude Code profile's own .mcp.json-shaped
+    # path to prove discover_profiles() won't duplicate an already-listed path.
+    proj = fake_home / "dup-project"
+    proj.mkdir()
+    mcp_path = proj / ".mcp.json"
+    mcp_path.write_text('{"mcpServers": {"x": {"command": "npx"}}}')
+    (fake_home / ".claude.json").write_text(json.dumps({"projects": {str(proj): {}}}))
+
+    direct = c.discover_project_configs(fake_home / ".claude.json")
+    assert len(direct) == 1
+
+    profs = c.discover_profiles()
+    project_profiles = [p for p in profs if str(p.path) == str(mcp_path)]
+    assert len(project_profiles) == 1
+
+
 # --------------------------------------------------------------------------- #
 # 2. Write pipeline: preserves other keys + order, only touches mcpServers
 # --------------------------------------------------------------------------- #