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

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

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)
• dateStart/dateEnd: 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)

{
  "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:

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.

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:

{"error": "Missing required parameter: concept"}

Fix: Add the concept parameter

Invalid concept:

{"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