feat: Sprint 15 — session projects, code copy button, tool card toggle

Session projects: named groups for organizing sessions. Project filter bar with chips between search and session list. Create/rename/delete projects, assign sessions via folder icon dropdown. Stored in projects.json, project_id on Session model. 5 new API endpoints. Code block copy button: every code block gets a Copy button in the language header (or top-right for plain blocks). Clipboard API with "Copied!" feedback. Tool card expand/collapse: messages with 2+ tool cards get an "Expand all / Collapse all" toggle above the card group. 13 new tests (237 total), all passing. No regressions. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
2026-04-01 23:55:21 -07:00
parent 8ed206657c
commit 1a4793848e
10 changed files with 650 additions and 74 deletions
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,24 @@

 ---

+## [v0.17] Sprint 15 -- Session Projects + Code Copy + Tool Card Toggle
+*April 1, 2026 | 237 tests*
+
+### Features
+- **Session projects.** Named groups for organizing sessions. A project filter
+  bar (subtle chips) sits between the search input and the session list. Each
+  project has a name and color. Click a chip to filter; "All" shows everything.
+  Create inline (+), rename (double-click), delete (right-click). Assign sessions
+  via folder icon button with dropdown picker. Projects stored in `projects.json`.
+  Session model gains `project_id` field. 5 new API endpoints.
+- **Code block copy button.** Every code block gets a "Copy" button in the
+  language header bar (or top-right for plain blocks). Click copies to clipboard,
+  shows "Copied!" for 1.5s.
+- **Tool card expand/collapse.** When a message has 2+ tool cards, "Expand all /
+  Collapse all" toggle appears above the card group.
+
+---
+
 ## [v0.16.2] Model List Updates + base_url Passthrough
 *April 1, 2026 | 247 tests*

--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -3,8 +3,8 @@
 > Goal: Full 1:1 parity with the Hermes CLI experience via a clean dark web UI.
 > Everything you can do from the CLI terminal, you can do from this UI.
 >
-> Last updated: Sprint 14 (March 30, 2026)
-> Tests: 226/226 passing
+> Last updated: Sprint 15 (April 1, 2026)
+> Tests: 237 passing
 > Source: <repo>/

 ---
@@ -30,6 +30,8 @@
 | Sprint 11 | Multi-provider models + streaming | Dynamic model dropdown (any Hermes provider), smooth scroll pinning, routes extracted to api/routes.py (server.py 704→76 lines) | 201 |
 | Sprint 12 | Settings + reliability + session QoL | Settings panel (gear icon, settings.json), SSE auto-reconnect, pin sessions, import session from JSON | 211 |
 | Sprint 13 | Alerts + polish | Cron completion alerts (polling + badge), background error banner, session duplicate, browser tab title | 221 |
+| Sprint 14 | Visual polish + workspace ops | Mermaid diagrams, message timestamps, file rename, folder create, session tags, session archive | 233 |
+| Sprint 15 | Session projects + code copy | Session projects/folders, code block copy button, tool card expand/collapse toggle | 237 |

 ---

@@ -103,6 +105,7 @@
 - [x] Import session from JSON (Sprint 12)
 - [x] Pin/star sessions to top of list (Sprint 12)
 - [x] Duplicate session (Sprint 13)
+- [x] Session projects / folders (Sprint 15)

 ### Workspace Management
 - [x] Add workspace with path validation (must be existing directory)
--- a/SPRINTS.md
+++ b/SPRINTS.md
@@ -146,7 +146,7 @@ to daily friction.

 ---

-## Sprint 14 -- Visual Polish + Workspace Ops + Session Organization
+## Sprint 14 -- Visual Polish + Workspace Ops + Session Organization (COMPLETED)

 **Theme:** Polish the visual experience, close workspace file gaps, and
 organize sessions properly.
@@ -169,60 +169,63 @@ organize sessions properly.
  sessions hidden from sidebar by default. "Show N archived" toggle at top
  of list. `POST /api/session/archive` endpoint.

-### Candidates for next sprints
- Workspace reorder (drag-and-drop)
- View skill linked files
- Voice input via Whisper
- Subagent delegation cards (enhanced tool card rendering)
-
 **Tests:** ~12 new. Total: ~233.
 **Hermes CLI parity impact:** Medium (file rename, folder create)
 **Claude parity impact:** Medium (Mermaid, tags, archive)

 ---

-## Sprint 15 -- Project Organization + Session Management
+## Sprint 15 -- Session Projects + Code Copy + Tool Card Toggle (COMPLETED)

 **Theme:** Organize work the way you think, not just chronologically.
+Plus two quick UX wins for code and agentic workflows.

 **Why now:** After 100+ sessions the sidebar is a flat chronological list.
-Finding sessions from 2 weeks ago, or keeping a "MyProject" workspace separate
-from personal work, requires the search box. This is the biggest remaining
-daily organizational gap vs. Claude's project folders.
+Finding sessions from 2 weeks ago, or keeping work separated by project,
+requires the search box. Session projects are the single biggest remaining
+organizational gap vs. Claude's project folders.

 ### Track A: Bugs
- Session search content scan (depth=5) is slow on large session histories.
-  Add server-side caching of search index.
- Date group headers ("Today / Yesterday / Earlier") use updated_at which can
-  be misleading for sessions touched by automated title-setting. Use created_at
-  for initial grouping, updated_at for sort order.
+- None.

 ### Track B: Features
- **Session folders / projects:** A "Projects" section above the session list.
-  Each project is a named group. Sessions can be dragged into projects or
-  assigned via right-click. Stored in `projects.json`. Projects collapse/expand.
-  This is the single biggest Claude parity feature missing.
- ~~Pin sessions~~ (DONE Sprint 12)
- ~~Import session from JSON~~ (DONE Sprint 12)
-
-### Deferred to later sprints
- Session tags / labels
- Archive sessions
- Rename file / Create folder (can be done through the agent)
- Toolset control per session
- Virtual scroll for session list
+- **Session projects:** Named groups for organizing sessions. A project
+  filter bar (subtle chips) sits between the search input and the session
+  list. Each project has a name and color. Click a chip to filter sessions
+  to that project; "All" shows everything. Create projects inline (+
+  button), rename (double-click chip), delete (right-click). Assign
+  sessions via folder icon button (hover-reveal) with a dropdown picker.
+  Projects stored in `projects.json`. Session model gains `project_id`
+  field (null = unassigned). Fully backward-compatible with existing
+  sessions. Endpoints: `GET /api/projects`, `POST /api/projects/create`,
+  `POST /api/projects/rename`, `POST /api/projects/delete`,
+  `POST /api/session/move`.
+- **Code block copy button:** Every code block gets a "Copy" button.
+  Positioned in the language header bar (or top-right corner for plain
+  code blocks). Click copies code to clipboard, shows "Copied!" for 1.5s.
+- **Tool card expand/collapse:** When a message has 2+ tool cards, an
+  "Expand all / Collapse all" toggle appears above the card group.
+  Scoped per message group, not global.

 ### Track C: Architecture
- Session index v2: extend `_index.json` to include `project_id` field.
-  Rebuild on session save. Enables fast client-side filtering without disk reads.
+- `projects.json` flat file storage for project list (same pattern as
+  `workspaces.json` and `settings.json`).
+- `project_id` field on Session model with backward-compatible null default.
+- `_index.json` includes `project_id` for fast client-side filtering.

-**Tests:** ~16 new. Total: ~241.
+**Tests:** 13 new. Total: ~237.
 **Hermes CLI parity impact:** Low (CLI has no session organization)
 **Claude parity impact:** Very High (projects are a core Claude concept)

+### Candidates for next sprints
+- Workspace reorder (drag-and-drop)
+- View skill linked files
+- Voice input via Whisper
+- Subagent delegation cards (enhanced tool card rendering)
+
 ---

-## Sprint 15 -- Artifacts + Code Execution
+## Sprint 16 -- Artifacts + Code Execution

 **Theme:** See outputs, not just text.

@@ -265,7 +268,7 @@ feels like. It also directly enables the Hermes "code execution cell" feature

 ---

-## Sprint 16 -- Voice + Multimodal Input
+## Sprint 17 -- Voice + Multimodal Input

 **Theme:** Input beyond the keyboard.

@@ -303,7 +306,7 @@ file uploads, not clipboard screenshots into the conversation directly).

 ---

-## Sprint 17 -- Subagent Visibility + Agentic Transparency
+## Sprint 18 -- Subagent Visibility + Agentic Transparency

 **Theme:** Watch Hermes think, not just respond.

@@ -343,7 +346,7 @@ what's happening. This is the last major "CLI feels better" gap for power users.

 ---

-## Sprint 18 -- Auth, HTTPS, and Production Hardening
+## Sprint 19 -- Auth, HTTPS, and Production Hardening

 **Theme:** Make this safe to leave running.

@@ -380,7 +383,7 @@ address.

 ## Feature Parity Summary

-### After Sprint 17 (Hermes CLI parity: complete)
+### After Sprint 18 (Hermes CLI parity: complete)

 | CLI Feature | Status |
 |-------------|--------|
@@ -395,16 +398,16 @@ address.
 | Session history | Done (v0.3) |
 | Workspace switching | Done (v0.7) |
 | Model selection | Done (v0.3) |
-| Multi-provider model support | Sprint 11 |
+| Multi-provider model support | Done (Sprint 11) |
 | Toolset control | Sprint 12 |
-| Settings persistence | Sprint 12 |
-| Subagent visibility | Sprint 17 |
-| Background task monitor | Sprint 17 |
-| Code execution (Jupyter) | Sprint 15 |
-| Cron completion alerts | Sprint 13 |
-| Virtual scroll (perf) | Sprint 13 |
+| Settings persistence | Done (Sprint 12) |
+| Subagent visibility | Sprint 18 |
+| Background task monitor | Sprint 18 |
+| Code execution (Jupyter) | Sprint 16 |
+| Cron completion alerts | Done (Sprint 13) |
+| Virtual scroll (perf) | Deferred |

-### After Sprint 18 (Claude parity: ~90% complete)
+### After Sprint 19 (Claude parity: ~90% complete)

 | Claude Feature | Status |
 |----------------|--------|
@@ -416,19 +419,19 @@ address.
 | Tool use visibility | Done (v0.11) |
 | Edit/regenerate messages | Done (v0.10) |
 | Session management | Done (v0.6) |
-| Artifacts (HTML/SVG preview) | Sprint 15 |
-| Code execution inline | Sprint 15 |
-| Mermaid diagrams | Sprint 15 |
-| Projects / folders | Sprint 14 |
-| Pinned/starred sessions | Sprint 14 |
-| Reasoning display | Sprint 17 |
-| Voice input | Sprint 16 |
-| TTS playback | Sprint 16 |
-| Notifications | Sprint 13 |
-| Settings panel | Sprint 12 |
-| Auth / login | Sprint 18 |
-| HTTPS | Sprint 18 |
-| Mobile layout | Sprint 18 |
+| Artifacts (HTML/SVG preview) | Sprint 16 |
+| Code execution inline | Sprint 16 |
+| Mermaid diagrams | Done (Sprint 14) |
+| Projects / folders | Done (Sprint 15) |
+| Pinned/starred sessions | Done (Sprint 12) |
+| Reasoning display | Sprint 18 |
+| Voice input | Sprint 17 |
+| TTS playback | Sprint 17 |
+| Notifications | Done (Sprint 13) |
+| Settings panel | Done (Sprint 12) |
+| Auth / login | Sprint 19 |
+| HTTPS | Sprint 19 |
+| Mobile layout | Done (v0.16.1) |
 | Sharing / public URLs | Not planned (requires server infra) |
 | Claude-specific features | Not replicable (Projects AI, artifacts sync) |

@@ -445,6 +448,6 @@ address.

 ---

-*Last updated: March 30, 2026*
-*Current version: v0.13 | 201 tests*
-*Next sprint: Sprint 14 (visual polish + small QoL)*
+*Last updated: April 1, 2026*
+*Current version: v0.17 | 237 tests*
+*Next sprint: Sprint 16 (Artifacts + Code Execution)*
--- a/api/config.py
+++ b/api/config.py
@@ -39,6 +39,7 @@ WORKSPACES_FILE       = STATE_DIR / 'workspaces.json'
 SESSION_INDEX_FILE    = SESSION_DIR / '_index.json'
 SETTINGS_FILE         = STATE_DIR / 'settings.json'
 LAST_WORKSPACE_FILE   = STATE_DIR / 'last_workspace.txt'
+PROJECTS_FILE         = STATE_DIR / 'projects.json'

 # ── Hermes agent directory discovery ─────────────────────────────────────────
 def _discover_agent_dir() -> Path:
--- a/api/models.py
+++ b/api/models.py
@@ -10,7 +10,7 @@ from pathlib import Path
 import api.config as _cfg
 from api.config import (
    SESSION_DIR, SESSION_INDEX_FILE, SESSIONS, SESSIONS_MAX,
-    LOCK, DEFAULT_WORKSPACE, DEFAULT_MODEL
+    LOCK, DEFAULT_WORKSPACE, DEFAULT_MODEL, PROJECTS_FILE
 )
 from api.workspace import get_last_workspace

@@ -34,8 +34,8 @@ def _write_session_index():


 class Session:
-    def __init__(self, session_id=None, title='Untitled', workspace=str(DEFAULT_WORKSPACE), model=DEFAULT_MODEL, messages=None, created_at=None, updated_at=None, tool_calls=None, pinned=False, archived=False, **kwargs):
-        self.session_id = session_id or uuid.uuid4().hex[:12]; self.title = title; self.workspace = str(Path(workspace).expanduser().resolve()); self.model = model; self.messages = messages or []; self.tool_calls = tool_calls or []; self.created_at = created_at or time.time(); self.updated_at = updated_at or time.time(); self.pinned = bool(pinned); self.archived = bool(archived)
+    def __init__(self, session_id=None, title='Untitled', workspace=str(DEFAULT_WORKSPACE), model=DEFAULT_MODEL, messages=None, created_at=None, updated_at=None, tool_calls=None, pinned=False, archived=False, project_id=None, **kwargs):
+        self.session_id = session_id or uuid.uuid4().hex[:12]; self.title = title; self.workspace = str(Path(workspace).expanduser().resolve()); self.model = model; self.messages = messages or []; self.tool_calls = tool_calls or []; self.created_at = created_at or time.time(); self.updated_at = updated_at or time.time(); self.pinned = bool(pinned); self.archived = bool(archived); self.project_id = project_id or None
    @property
    def path(self): return SESSION_DIR / f'{self.session_id}.json'
    def save(self): self.updated_at = time.time(); self.path.write_text(json.dumps(self.__dict__, ensure_ascii=False, indent=2), encoding='utf-8'); _write_session_index()
@@ -44,7 +44,7 @@ class Session:
        p = SESSION_DIR / f'{sid}.json'
        if not p.exists(): return None
        return cls(**json.loads(p.read_text(encoding='utf-8')))
-    def compact(self): return {'session_id': self.session_id, 'title': self.title, 'workspace': self.workspace, 'model': self.model, 'message_count': len(self.messages), 'created_at': self.created_at, 'updated_at': self.updated_at, 'pinned': self.pinned, 'archived': self.archived}
+    def compact(self): return {'session_id': self.session_id, 'title': self.title, 'workspace': self.workspace, 'model': self.model, 'message_count': len(self.messages), 'created_at': self.created_at, 'updated_at': self.updated_at, 'pinned': self.pinned, 'archived': self.archived, 'project_id': self.project_id}

 def get_session(sid):
    with LOCK:
@@ -114,3 +114,19 @@ def title_from(messages, fallback='Untitled'):
            if text:
                return text[:64]
    return fallback
+
+
+# ── Project helpers ──────────────────────────────────────────────────────────
+
+def load_projects():
+    """Load project list from disk. Returns list of project dicts."""
+    if not PROJECTS_FILE.exists():
+        return []
+    try:
+        return json.loads(PROJECTS_FILE.read_text(encoding='utf-8'))
+    except Exception:
+        return []
+
+def save_projects(projects):
+    """Write project list to disk."""
+    PROJECTS_FILE.write_text(json.dumps(projects, ensure_ascii=False, indent=2), encoding='utf-8')
--- a/api/routes.py
+++ b/api/routes.py
@@ -23,6 +23,7 @@ from api.helpers import require, bad, safe_resolve, j, t, read_body
 from api.models import (
    Session, get_session, new_session, all_sessions, title_from,
    _write_session_index, SESSION_INDEX_FILE,
+    load_projects, save_projects,
 )
 from api.workspace import (
    load_workspaces, save_workspaces, get_last_workspace, set_last_workspace,
@@ -93,6 +94,9 @@ def handle_get(handler, parsed):
    if parsed.path == '/api/sessions':
        return j(handler, {'sessions': all_sessions()})

+    if parsed.path == '/api/projects':
+        return j(handler, {'projects': load_projects()})
+
    if parsed.path == '/api/session/export':
        return _handle_session_export(handler, parsed)

@@ -327,6 +331,61 @@ def handle_post(handler, parsed):
        s.save()
        return j(handler, {'ok': True, 'session': s.compact()})

+    # ── Session move to project (POST) ──
+    if parsed.path == '/api/session/move':
+        try: require(body, 'session_id')
+        except ValueError as e: return bad(handler, str(e))
+        try: s = get_session(body['session_id'])
+        except KeyError: return bad(handler, 'Session not found', 404)
+        s.project_id = body.get('project_id') or None
+        s.save()
+        return j(handler, {'ok': True, 'session': s.compact()})
+
+    # ── Project CRUD (POST) ──
+    if parsed.path == '/api/projects/create':
+        try: require(body, 'name')
+        except ValueError as e: return bad(handler, str(e))
+        projects = load_projects()
+        proj = {'project_id': uuid.uuid4().hex[:12], 'name': body['name'], 'color': body.get('color'), 'created_at': time.time()}
+        projects.append(proj)
+        save_projects(projects)
+        return j(handler, {'ok': True, 'project': proj})
+
+    if parsed.path == '/api/projects/rename':
+        try: require(body, 'project_id', 'name')
+        except ValueError as e: return bad(handler, str(e))
+        projects = load_projects()
+        proj = next((p for p in projects if p['project_id'] == body['project_id']), None)
+        if not proj: return bad(handler, 'Project not found', 404)
+        proj['name'] = body['name']
+        if 'color' in body: proj['color'] = body['color']
+        save_projects(projects)
+        return j(handler, {'ok': True, 'project': proj})
+
+    if parsed.path == '/api/projects/delete':
+        try: require(body, 'project_id')
+        except ValueError as e: return bad(handler, str(e))
+        projects = load_projects()
+        proj = next((p for p in projects if p['project_id'] == body['project_id']), None)
+        if not proj: return bad(handler, 'Project not found', 404)
+        projects = [p for p in projects if p['project_id'] != body['project_id']]
+        save_projects(projects)
+        # Unassign all sessions that belonged to this project
+        if SESSION_INDEX_FILE.exists():
+            try:
+                index = json.loads(SESSION_INDEX_FILE.read_text(encoding='utf-8'))
+                for entry in index:
+                    if entry.get('project_id') == body['project_id']:
+                        try:
+                            s = get_session(entry['session_id'])
+                            s.project_id = None
+                            s.save()
+                        except Exception:
+                            pass
+            except Exception:
+                pass
+        return j(handler, {'ok': True})
+
    # ── Session import from JSON (POST) ──
    if parsed.path == '/api/session/import':
        return _handle_session_import(handler, body)
--- a/static/sessions.js
+++ b/static/sessions.js
@@ -56,12 +56,18 @@ async function loadSession(sid){
 let _allSessions = [];  // cached for search filter
 let _renamingSid = null;  // session_id currently being renamed (blocks list re-renders)
 let _showArchived = false;  // toggle to show archived sessions
+let _allProjects = [];  // cached project list
+let _activeProject = null;  // project_id filter (null = show all)

 async function renderSessionList(){
  try{
    if(!($('sessionSearch').value||'').trim()) _contentSearchResults = [];
-    const data=await api('/api/sessions');
-    _allSessions = data.sessions||[];
+    const [sessData, projData] = await Promise.all([
+      api('/api/sessions'),
+      api('/api/projects'),
+    ]);
+    _allSessions = sessData.sessions||[];
+    _allProjects = projData.projects||[];
    renderSessionListFromCache();  // no-ops if rename is in progress
  }catch(e){console.warn('renderSessionList',e);}
 }
@@ -94,10 +100,49 @@ function renderSessionListFromCache(){
  // Merge content matches (deduped): content matches appended after title matches
  const titleIds=new Set(titleMatches.map(s=>s.session_id));
  const allMatched=q?[...titleMatches,..._contentSearchResults.filter(s=>!titleIds.has(s.session_id))]:titleMatches;
+  // Filter by active project
+  const projectFiltered=_activeProject?allMatched.filter(s=>s.project_id===_activeProject):allMatched;
  // Filter archived unless toggle is on
-  const sessions=_showArchived?allMatched:allMatched.filter(s=>!s.archived);
-  const archivedCount=allMatched.filter(s=>s.archived).length;
+  const sessions=_showArchived?projectFiltered:projectFiltered.filter(s=>!s.archived);
+  const archivedCount=projectFiltered.filter(s=>s.archived).length;
  const list=$('sessionList');list.innerHTML='';
+  // Project filter bar (only when projects exist)
+  if(_allProjects.length>0){
+    const bar=document.createElement('div');
+    bar.className='project-bar';
+    // "All" chip
+    const allChip=document.createElement('span');
+    allChip.className='project-chip'+(!_activeProject?' active':'');
+    allChip.textContent='All';
+    allChip.onclick=()=>{_activeProject=null;renderSessionListFromCache();};
+    bar.appendChild(allChip);
+    // Project chips
+    for(const p of _allProjects){
+      const chip=document.createElement('span');
+      chip.className='project-chip'+(p.project_id===_activeProject?' active':'');
+      if(p.color){
+        const dot=document.createElement('span');
+        dot.className='color-dot';
+        dot.style.background=p.color;
+        chip.appendChild(dot);
+      }
+      const nameSpan=document.createElement('span');
+      nameSpan.textContent=p.name;
+      chip.appendChild(nameSpan);
+      chip.onclick=()=>{_activeProject=p.project_id;renderSessionListFromCache();};
+      chip.ondblclick=(e)=>{e.stopPropagation();_startProjectRename(p,chip);};
+      chip.oncontextmenu=(e)=>{e.preventDefault();_confirmDeleteProject(p);};
+      bar.appendChild(chip);
+    }
+    // Create button
+    const addBtn=document.createElement('button');
+    addBtn.className='project-create-btn';
+    addBtn.textContent='+';
+    addBtn.title='New project';
+    addBtn.onclick=(e)=>{e.stopPropagation();_startProjectCreate(bar,addBtn);};
+    bar.appendChild(addBtn);
+    list.appendChild(bar);
+  }
  // Show/hide archived toggle if there are archived sessions
  if(archivedCount>0){
    const toggle=document.createElement('div');
@@ -106,6 +151,13 @@ function renderSessionListFromCache(){
    toggle.onclick=()=>{_showArchived=!_showArchived;renderSessionListFromCache();};
    list.appendChild(toggle);
  }
+  // Empty state for active project filter
+  if(_activeProject&&sessions.length===0){
+    const empty=document.createElement('div');
+    empty.style.cssText='padding:20px 14px;color:var(--muted);font-size:12px;text-align:center;opacity:.7;';
+    empty.textContent='No sessions in this project yet.';
+    list.appendChild(empty);
+  }
  // Separate pinned from unpinned
  const pinned=sessions.filter(s=>s.pinned);
  const unpinned=sessions.filter(s=>!s.pinned);
@@ -233,7 +285,22 @@ function renderSessionListFromCache(){
    const trash=document.createElement('button');
    trash.className='session-trash';trash.innerHTML='&#128465;';trash.title='Delete';
    trash.onclick=async(e)=>{e.stopPropagation();e.preventDefault();await deleteSession(s.session_id);};
-    el.appendChild(pin);el.appendChild(title);el.appendChild(archive);el.appendChild(dup);el.appendChild(trash);
+    // Project move button (folder icon)
+    const move=document.createElement('button');
+    move.className='session-action-btn';move.innerHTML='&#128194;';move.title='Move to project';
+    move.onclick=async(e)=>{e.stopPropagation();e.preventDefault();_showProjectPicker(s,move);};
+    // Project dot indicator
+    if(s.project_id){
+      const proj=_allProjects.find(p=>p.project_id===s.project_id);
+      if(proj){
+        const dot=document.createElement('span');
+        dot.className='session-project-dot';
+        dot.style.background=proj.color||'var(--blue)';
+        dot.title=proj.name;
+        title.appendChild(dot);
+      }
+    }
+    el.appendChild(pin);el.appendChild(title);el.appendChild(move);el.appendChild(archive);el.appendChild(dup);el.appendChild(trash);

    // Use a click timer to distinguish single-click (navigate) from double-click (rename).
    // This prevents loadSession from firing on the first click of a double-click,
@@ -241,7 +308,7 @@ function renderSessionListFromCache(){
    let _clickTimer=null;
    el.onclick=async(e)=>{
      if(_renamingSid) return; // ignore while any rename is active
-      if([trash,dup,archive].some(b=>e.target===b||b.contains(e.target))) return;
+      if([trash,dup,archive,move].some(b=>e.target===b||b.contains(e.target))) return;
      clearTimeout(_clickTimer);
      _clickTimer=setTimeout(async()=>{
        _clickTimer=null;
@@ -284,4 +351,109 @@ async function deleteSession(sid){
  await renderSessionList();
 }

+// ── Project helpers ─────────────────────────────────────────────────────
+
+const PROJECT_COLORS=['#7cb9ff','#f5c542','#e94560','#50c878','#c084fc','#fb923c','#67e8f9','#f472b6'];
+
+function _showProjectPicker(session, anchorEl){
+  // Close any existing picker
+  document.querySelectorAll('.project-picker').forEach(p=>p.remove());
+  const picker=document.createElement('div');
+  picker.className='project-picker';
+  // "No project" option
+  const none=document.createElement('div');
+  none.className='project-picker-item'+(!session.project_id?' active':'');
+  none.textContent='No project';
+  none.onclick=async()=>{
+    picker.remove();
+    await api('/api/session/move',{method:'POST',body:JSON.stringify({session_id:session.session_id,project_id:null})});
+    session.project_id=null;
+    renderSessionListFromCache();
+    showToast('Removed from project');
+  };
+  picker.appendChild(none);
+  // Project options
+  for(const p of _allProjects){
+    const item=document.createElement('div');
+    item.className='project-picker-item'+(session.project_id===p.project_id?' active':'');
+    if(p.color){
+      const dot=document.createElement('span');
+      dot.className='color-dot';
+      dot.style.cssText='width:6px;height:6px;border-radius:50%;background:'+p.color+';flex-shrink:0;';
+      item.appendChild(dot);
+    }
+    const name=document.createElement('span');
+    name.textContent=p.name;
+    item.appendChild(name);
+    item.onclick=async()=>{
+      picker.remove();
+      await api('/api/session/move',{method:'POST',body:JSON.stringify({session_id:session.session_id,project_id:p.project_id})});
+      session.project_id=p.project_id;
+      renderSessionListFromCache();
+      showToast('Moved to '+p.name);
+    };
+    picker.appendChild(item);
+  }
+  // Position relative to anchor
+  anchorEl.style.position='relative';
+  anchorEl.appendChild(picker);
+  // Close on outside click
+  const close=(e)=>{if(!picker.contains(e.target)&&e.target!==anchorEl){picker.remove();document.removeEventListener('click',close);}};
+  setTimeout(()=>document.addEventListener('click',close),0);
+}
+
+function _startProjectCreate(bar, addBtn){
+  const inp=document.createElement('input');
+  inp.className='project-create-input';
+  inp.placeholder='Project name';
+  const finish=async(save)=>{
+    if(save&&inp.value.trim()){
+      const color=PROJECT_COLORS[_allProjects.length%PROJECT_COLORS.length];
+      await api('/api/projects/create',{method:'POST',body:JSON.stringify({name:inp.value.trim(),color})});
+      await renderSessionList();
+      showToast('Project created');
+    }else{
+      inp.replaceWith(addBtn);
+    }
+  };
+  inp.onkeydown=(e)=>{
+    if(e.key==='Enter'){e.preventDefault();finish(true);}
+    if(e.key==='Escape'){e.preventDefault();finish(false);}
+  };
+  inp.onblur=()=>finish(false);
+  addBtn.replaceWith(inp);
+  setTimeout(()=>inp.focus(),10);
+}
+
+function _startProjectRename(proj, chip){
+  const inp=document.createElement('input');
+  inp.className='project-create-input';
+  inp.value=proj.name;
+  const finish=async(save)=>{
+    if(save&&inp.value.trim()&&inp.value.trim()!==proj.name){
+      await api('/api/projects/rename',{method:'POST',body:JSON.stringify({project_id:proj.project_id,name:inp.value.trim()})});
+      await renderSessionList();
+      showToast('Project renamed');
+    }else{
+      renderSessionListFromCache();
+    }
+  };
+  inp.onkeydown=(e)=>{
+    if(e.key==='Enter'){e.preventDefault();finish(true);}
+    if(e.key==='Escape'){e.preventDefault();finish(false);}
+  };
+  inp.onblur=()=>finish(false);
+  inp.onclick=(e)=>e.stopPropagation();
+  chip.replaceWith(inp);
+  setTimeout(()=>{inp.focus();inp.select();},10);
+}
+
+async function _confirmDeleteProject(proj){
+  if(!confirm('Delete project "'+proj.name+'"? Sessions will be unassigned but not deleted.')){return;}
+  await api('/api/projects/delete',{method:'POST',body:JSON.stringify({project_id:proj.project_id})});
+  if(_activeProject===proj.project_id) _activeProject=null;
+  await renderSessionList();
+  showToast('Project deleted');
+}
+

--- a/static/style.css
+++ b/static/style.css
@@ -529,4 +529,28 @@ body.resizing{user-select:none;cursor:col-resize;}
 .mermaid-rendered{background:transparent;padding:8px 0;}
 .mermaid-rendered svg{max-width:100%;height:auto;}

+/* ── Session projects ── */
+.project-bar{display:flex;gap:4px;padding:4px 10px 8px;flex-wrap:wrap;align-items:center;flex-shrink:0;}
+.project-chip{font-size:10px;font-weight:600;padding:3px 8px;border-radius:12px;cursor:pointer;border:1px solid var(--border2);background:rgba(255,255,255,.04);color:var(--muted);transition:all .15s;white-space:nowrap;display:inline-flex;align-items:center;gap:4px;}
+.project-chip:hover{background:rgba(255,255,255,.08);color:var(--text);}
+.project-chip.active{background:rgba(124,185,255,.12);color:var(--blue);border-color:rgba(124,185,255,.4);}
+.project-chip .color-dot{width:6px;height:6px;border-radius:50%;display:inline-block;flex-shrink:0;}
+.project-create-btn{font-size:10px;padding:3px 6px;border-radius:12px;cursor:pointer;border:1px dashed var(--border2);background:none;color:var(--muted);opacity:.6;transition:all .15s;}
+.project-create-btn:hover{opacity:1;border-color:var(--blue);color:var(--blue);}
+.project-create-input{font-size:10px;padding:3px 8px;border-radius:12px;border:1px solid rgba(124,185,255,.6);background:rgba(20,32,60,.9);color:var(--text);outline:none;width:100px;font-family:inherit;box-shadow:0 0 0 2px rgba(124,185,255,.15);}
+.project-picker{position:absolute;right:0;top:100%;background:var(--sidebar);border:1px solid var(--border2);border-radius:8px;padding:4px;z-index:30;min-width:140px;box-shadow:0 4px 16px rgba(0,0,0,.3);}
+.project-picker-item{padding:5px 10px;font-size:11px;border-radius:6px;cursor:pointer;color:var(--muted);transition:all .1s;display:flex;align-items:center;gap:6px;}
+.project-picker-item:hover{background:rgba(255,255,255,.08);color:var(--text);}
+.project-picker-item.active{color:var(--blue);}
+.session-project-dot{width:6px;height:6px;border-radius:50%;flex-shrink:0;display:inline-block;margin-left:4px;vertical-align:middle;}
+
+/* ── Code copy button ── */
+.code-copy-btn{background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.1);border-radius:4px;color:var(--muted);font-size:11px;cursor:pointer;padding:2px 6px;transition:all .15s;line-height:1.3;}
+.code-copy-btn:hover{background:rgba(255,255,255,.12);color:var(--text);}
+
+/* ── Tool card expand/collapse toggle ── */
+.tool-cards-toggle{margin:4px 0 2px 40px;display:flex;gap:8px;}
+.tool-cards-toggle button{background:none;border:none;color:var(--blue);font-size:10px;cursor:pointer;opacity:.6;padding:0;}
+.tool-cards-toggle button:hover{opacity:1;text-decoration:underline;}
+
 .bg-error-banner{background:rgba(229,62,62,.15);border:1px solid rgba(229,62,62,.3);color:#fca5a5;padding:8px 16px;font-size:12px;display:flex;align-items:center;justify-content:space-between;gap:12px;border-radius:0;}
--- a/static/ui.js
+++ b/static/ui.js
@@ -374,13 +374,29 @@ function renderMessages(){
      }
      const frag=document.createDocumentFragment();
      for(const tc of cards){frag.appendChild(buildToolCard(tc));}
+      // Add expand/collapse toggle for groups with 2+ cards
+      if(cards.length>=2){
+        const toggle=document.createElement('div');
+        toggle.className='tool-cards-toggle';
+        // Collect card elements before they get moved to DOM
+        const cardEls=Array.from(frag.querySelectorAll('.tool-card'));
+        const expandBtn=document.createElement('button');
+        expandBtn.textContent='Expand all';
+        expandBtn.onclick=()=>cardEls.forEach(c=>c.classList.add('open'));
+        const collapseBtn=document.createElement('button');
+        collapseBtn.textContent='Collapse all';
+        collapseBtn.onclick=()=>cardEls.forEach(c=>c.classList.remove('open'));
+        toggle.appendChild(expandBtn);
+        toggle.appendChild(collapseBtn);
+        frag.insertBefore(toggle,frag.firstChild);
+      }
      if(insertBefore) inner.insertBefore(frag,insertBefore);
      else inner.appendChild(frag);
    }
  }
  scrollToBottom();
  // Apply syntax highlighting after DOM is built
-  requestAnimationFrame(()=>{highlightCode();renderMermaidBlocks();});
+  requestAnimationFrame(()=>{highlightCode();addCopyButtons();renderMermaidBlocks();});
  // Refresh todo panel if it's currently open
  if(typeof loadTodos==='function' && document.getElementById('panelTodos') && document.getElementById('panelTodos').classList.contains('active')){
    loadTodos();
@@ -558,6 +574,36 @@ function highlightCode(container) {
  Prism.highlightAllUnder(el);
 }

+function addCopyButtons(container){
+  const el=container||$('msgInner');
+  if(!el) return;
+  el.querySelectorAll('pre > code').forEach(codeEl=>{
+    const pre=codeEl.parentElement;
+    if(pre.querySelector('.code-copy-btn')) return;
+    const btn=document.createElement('button');
+    btn.className='code-copy-btn';
+    btn.textContent='Copy';
+    btn.onclick=(e)=>{
+      e.stopPropagation();
+      navigator.clipboard.writeText(codeEl.textContent).then(()=>{
+        btn.textContent='Copied!';
+        setTimeout(()=>{btn.textContent='Copy';},1500);
+      });
+    };
+    const header=pre.previousElementSibling;
+    if(header&&header.classList.contains('pre-header')){
+      header.style.display='flex';
+      header.style.justifyContent='space-between';
+      header.style.alignItems='center';
+      header.appendChild(btn);
+    }else{
+      pre.style.position='relative';
+      btn.style.cssText='position:absolute;top:6px;right:6px;';
+      pre.appendChild(btn);
+    }
+  });
+}
+
 let _mermaidLoading=false;
 let _mermaidReady=false;

--- a/tests/test_sprint15.py
+++ b/tests/test_sprint15.py
@@ -0,0 +1,234 @@
+"""
+Sprint 15 Tests: session projects (CRUD, move, backward compat).
+"""
+import json, urllib.error, urllib.request
+
+BASE = "http://127.0.0.1:8788"
+
+
+def get(path):
+    with urllib.request.urlopen(BASE + path, timeout=10) as r:
+        return json.loads(r.read()), r.status
+
+
+def post(path, body=None):
+    data = json.dumps(body or {}).encode()
+    req = urllib.request.Request(BASE + path, data=data,
+                                headers={"Content-Type": "application/json"})
+    try:
+        with urllib.request.urlopen(req, timeout=10) as r:
+            return json.loads(r.read()), r.status
+    except urllib.error.HTTPError as e:
+        return json.loads(e.read()), e.code
+
+
+def make_session(created_list):
+    d, _ = post("/api/session/new", {})
+    sid = d["session"]["session_id"]
+    created_list.append(sid)
+    return sid, d["session"]
+
+
+def make_project(created_list, name="Test Project", color=None):
+    body = {"name": name}
+    if color:
+        body["color"] = color
+    d, status = post("/api/projects/create", body)
+    assert status == 200
+    pid = d["project"]["project_id"]
+    created_list.append(pid)
+    return pid, d["project"]
+
+
+def cleanup_projects(project_ids):
+    for pid in project_ids:
+        try:
+            post("/api/projects/delete", {"project_id": pid})
+        except Exception:
+            pass
+
+
+# ── Project CRUD ─────────────────────────────────────────────────────────
+
+def test_create_project():
+    """Creating a project returns a valid project dict."""
+    pids = []
+    try:
+        pid, proj = make_project(pids, "My Project", "#7cb9ff")
+        assert pid and len(pid) == 12
+        assert proj["name"] == "My Project"
+        assert proj["color"] == "#7cb9ff"
+        assert "created_at" in proj
+    finally:
+        cleanup_projects(pids)
+
+
+def test_list_projects_empty():
+    """Listing projects when none exist returns empty list."""
+    d, status = get("/api/projects")
+    assert status == 200
+    assert isinstance(d["projects"], list)
+
+
+def test_list_projects():
+    """Listing projects returns created projects."""
+    pids = []
+    try:
+        make_project(pids, "Alpha")
+        make_project(pids, "Beta")
+        d, status = get("/api/projects")
+        assert status == 200
+        names = [p["name"] for p in d["projects"]]
+        assert "Alpha" in names
+        assert "Beta" in names
+    finally:
+        cleanup_projects(pids)
+
+
+def test_rename_project():
+    """Renaming a project updates its name."""
+    pids = []
+    try:
+        pid, _ = make_project(pids, "Old Name")
+        d, status = post("/api/projects/rename", {"project_id": pid, "name": "New Name"})
+        assert status == 200
+        assert d["project"]["name"] == "New Name"
+        # Verify via list
+        dl, _ = get("/api/projects")
+        names = [p["name"] for p in dl["projects"]]
+        assert "New Name" in names
+        assert "Old Name" not in names
+    finally:
+        cleanup_projects(pids)
+
+
+def test_delete_project():
+    """Deleting a project removes it from the list."""
+    pids = []
+    try:
+        pid, _ = make_project(pids, "Doomed")
+        d, status = post("/api/projects/delete", {"project_id": pid})
+        assert status == 200
+        assert d["ok"] is True
+        dl, _ = get("/api/projects")
+        assert all(p["project_id"] != pid for p in dl["projects"])
+        pids.clear()  # already deleted
+    finally:
+        cleanup_projects(pids)
+
+
+def test_delete_project_unassigns_sessions():
+    """Deleting a project unassigns all sessions that belonged to it."""
+    pids = []
+    sids = []
+    try:
+        pid, _ = make_project(pids, "Temp Project")
+        sid, _ = make_session(sids)
+        # Assign session to project
+        post("/api/session/move", {"session_id": sid, "project_id": pid})
+        # Verify assigned
+        sd, _ = get(f"/api/session?session_id={sid}")
+        assert sd["session"].get("project_id") == pid
+        # Delete project
+        post("/api/projects/delete", {"project_id": pid})
+        pids.clear()
+        # Verify session is unassigned
+        sd2, _ = get(f"/api/session?session_id={sid}")
+        assert sd2["session"].get("project_id") is None
+    finally:
+        cleanup_projects(pids)
+        for s in sids:
+            post("/api/session/delete", {"session_id": s})
+
+
+def test_create_project_requires_name():
+    """Creating a project without a name returns 400."""
+    d, status = post("/api/projects/create", {})
+    assert status == 400
+
+
+def test_delete_nonexistent_project():
+    """Deleting a project that doesn't exist returns 404."""
+    d, status = post("/api/projects/delete", {"project_id": "nonexistent99"})
+    assert status == 404
+
+
+# ── Session move ─────────────────────────────────────────────────────────
+
+def test_session_move_to_project():
+    """Moving a session to a project sets its project_id."""
+    pids = []
+    sids = []
+    try:
+        pid, _ = make_project(pids, "Work")
+        sid, _ = make_session(sids)
+        d, status = post("/api/session/move", {"session_id": sid, "project_id": pid})
+        assert status == 200
+        assert d["session"]["project_id"] == pid
+    finally:
+        cleanup_projects(pids)
+        for s in sids:
+            post("/api/session/delete", {"session_id": s})
+
+
+def test_session_move_to_unassigned():
+    """Moving a session to null project unassigns it."""
+    pids = []
+    sids = []
+    try:
+        pid, _ = make_project(pids, "Temp")
+        sid, _ = make_session(sids)
+        # Assign then unassign
+        post("/api/session/move", {"session_id": sid, "project_id": pid})
+        d, status = post("/api/session/move", {"session_id": sid, "project_id": None})
+        assert status == 200
+        assert d["session"]["project_id"] is None
+    finally:
+        cleanup_projects(pids)
+        for s in sids:
+            post("/api/session/delete", {"session_id": s})
+
+
+def test_session_project_in_list():
+    """Session list includes project_id for assigned sessions."""
+    pids = []
+    sids = []
+    try:
+        pid, _ = make_project(pids, "Listed")
+        sid, _ = make_session(sids)
+        # Give it a title so it shows in list (non-empty Untitled sessions are hidden)
+        post("/api/session/rename", {"session_id": sid, "title": "Project Test Session"})
+        post("/api/session/move", {"session_id": sid, "project_id": pid})
+        dl, _ = get("/api/sessions")
+        match = [s for s in dl["sessions"] if s["session_id"] == sid]
+        assert len(match) == 1
+        assert match[0]["project_id"] == pid
+    finally:
+        cleanup_projects(pids)
+        for s in sids:
+            post("/api/session/delete", {"session_id": s})
+
+
+# ── Backward compat ──────────────────────────────────────────────────────
+
+def test_compact_includes_project_id():
+    """New session compact dict includes project_id as null."""
+    sids = []
+    try:
+        sid, sess = make_session(sids)
+        # Give it a title so it appears in the list
+        post("/api/session/rename", {"session_id": sid, "title": "Compat Test"})
+        dl, _ = get("/api/sessions")
+        match = [s for s in dl["sessions"] if s["session_id"] == sid]
+        assert len(match) == 1
+        assert "project_id" in match[0]
+        assert match[0]["project_id"] is None
+    finally:
+        for s in sids:
+            post("/api/session/delete", {"session_id": s})
+
+
+def test_session_move_requires_session_id():
+    """Moving without session_id returns 400."""
+    d, status = post("/api/session/move", {"project_id": "abc"})
+    assert status == 400