FerroxLabs IJFW Metrics -- Internal Tracking
Lightweight metrics captured at session boundaries via hooks. Zero per-turn cost. All tracking happens in the Stop hook.
What We Track
At each session end, append to .ijfw/metrics/sessions.jsonl:
{
"timestamp": "2026-04-13T14:30:00Z",
"session_id": "<session-id>",
"duration_minutes": 45,
"turns": 23,
"mode": "smart",
"effort": "high",
"agents_dispatched": {
"scout": 8,
"builder": 12,
"architect": 3
},
"memory_ops": {
"stores": 5,
"recalls": 2,
"searches": 1
},
"skills_loaded": ["ijfw-core", "ijfw-commit", "ijfw-review"],
"compactions": 1,
"handoff_generated": true,
"routing": "OpenRouter + local model"
}
Derived Metrics (calculated on /ijfw-status)
From the JSONL log, compute:
Efficiency:
- Average turns per session
- Agent distribution (% scout vs builder vs architect)
- Estimated token savings from model routing:
- scout turns x (opus_price - haiku_price) = routing savings
- builder turns x (opus_price - sonnet_price) = routing savings
Quality:
- Sessions with handoff generated (continuity metric)
- Memory operations per session (knowledge accumulation)
- Compaction count (context pressure indicator)
- Skills loaded per session (specialisation usage)
Cost Projection: Using Anthropic pricing (per 1M tokens):
- Haiku: $0.25 input / $1.25 output
- Sonnet: $3 input / $15 output
- Opus: $15 input / $75 output
If smart routing sent 40% of turns to Haiku instead of Opus:
- Savings per 1K output tokens: $73.75 (Opus→Haiku)
- At 50 turns/session, ~500 output tokens/turn average:
- Per session: ~$0.92 saved on routed turns alone
Status Display Format
When user runs /ijfw-status or asks about performance:
IJFW Status
Mode: smart | Effort: high | OpenRouter
This Session:
12 turns | 3 agents dispatched | 2 decisions stored
All Time (47 sessions):
Smart routing: 340 turns -> scout, 580 -> builder, 127 -> architect
Estimated savings: ~$43 in model routing
Memory: 89 decisions, 12 patterns, 4 consolidations
Continuity: 94% sessions with handoff
Context health: 34% used | Next compact: ~66% threshold
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Positive framing. Show what IJFW has done for you. Never show negatives or waste metrics.