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skills/mem-search/operations/by-concept.md

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+# Search by Concept
+
+Find observations tagged with specific concepts.
+
+## When to Use
+
+- User asks: "What discoveries did we make?"
+- User asks: "What patterns did we identify?"
+- User asks: "What gotchas did we encounter?"
+- Looking for observations with semantic tags
+
+## Command
+
+```bash
+curl -s "http://localhost:37777/api/search/by-concept?concept=discovery&format=index&limit=5"
+```
+
+## Parameters
+
+- **concept** (required): Concept tag to search for
+  - `discovery` - New discoveries and insights
+  - `problem-solution` - Problems and their solutions
+  - `what-changed` - Change descriptions
+  - `how-it-works` - Explanations of mechanisms
+  - `pattern` - Identified patterns
+  - `gotcha` - Edge cases and gotchas
+  - `change` - General changes
+- **format**: "index" (summary) or "full" (complete details). Default: "full"
+- **limit**: Number of results (default: 20, max: 100)
+- **project**: Filter by project name (optional)
+- **dateRange**: Filter by date range (optional)
+
+## When to Use Each Format
+
+**Use format=index for:**
+- Quick overviews of observations by concept
+- Finding IDs for deeper investigation
+- Listing multiple results
+- **Token cost: ~50-100 per result**
+
+**Use format=full for:**
+- Complete details including narrative, facts, files, concepts
+- Understanding the full context of specific observations
+- **Token cost: ~500-1000 per result**
+
+## Example Response (format=index)
+
+```json
+{
+  "concept": "discovery",
+  "count": 3,
+  "format": "index",
+  "results": [
+    {
+      "id": 1240,
+      "type": "discovery",
+      "title": "Worker service uses PM2 for process management",
+      "subtitle": "Discovered persistent background worker pattern",
+      "created_at_epoch": 1699564800000,
+      "project": "claude-mem",
+      "concepts": ["discovery", "how-it-works"]
+    }
+  ]
+}
+```
+
+## How to Present Results
+
+For format=index, present as a compact list:
+
+```markdown
+Found 3 observations tagged with "discovery":
+
+🔵 **#1240** Worker service uses PM2 for process management
+   > Discovered persistent background worker pattern
+   > Nov 9, 2024 • claude-mem
+   > Tags: discovery, how-it-works
+
+🔵 **#1241** FTS5 full-text search enables instant searches
+   > SQLite FTS5 virtual tables provide sub-100ms search
+   > Nov 9, 2024 • claude-mem
+   > Tags: discovery, pattern
+```
+
+For complete formatting guidelines, see [formatting.md](formatting.md).
+
+## Available Concepts
+
+| Concept | Description | When to Use |
+|---------|-------------|-------------|
+| `discovery` | New discoveries and insights | Finding what was learned |
+| `problem-solution` | Problems and their solutions | Finding how issues were resolved |
+| `what-changed` | Change descriptions | Understanding what changed |
+| `how-it-works` | Explanations of mechanisms | Learning how things work |
+| `pattern` | Identified patterns | Finding design patterns |
+| `gotcha` | Edge cases and gotchas | Learning about pitfalls |
+| `change` | General changes | Tracking modifications |
+
+## Error Handling
+
+**Missing concept parameter:**
+```json
+{"error": "Missing required parameter: concept"}
+```
+Fix: Add the concept parameter
+
+**Invalid concept:**
+```json
+{"error": "Invalid concept: foobar. Valid concepts: discovery, problem-solution, what-changed, how-it-works, pattern, gotcha, change"}
+```
+Fix: Use one of the valid concept values
+
+## Tips
+
+1. Use format=index first to see overview
+2. Start with limit=5-10 to avoid token overload
+3. Combine concepts with type filtering for precision
+4. Use `discovery` for learning what was found during investigation
+5. Use `problem-solution` for finding how past issues were resolved
+
+**Token Efficiency:**
+- Start with format=index (~50-100 tokens per result)
+- Use format=full only for relevant items (~500-1000 tokens per result)
+- See [../principles/progressive-disclosure.md](../principles/progressive-disclosure.md)