5.3 CodeGraph Blast-Radius Prevention & FinOps Routing

graphify index . && chinwag pr-notes inspect-pr

Two questions determine whether an autonomous coding workflow saves money or creates technical debt:

1. Structural Blast Radius: "If Agent A changes this trait signature in core-types, how many downstream crates and tests will break?"
2. Model-Tier Efficiency: "Does this 40-line JSON schema migration require an ultra-tier reasoning model, or will a fast coding model pass every gate on the first try at a fraction of the cost?"

Chinwag Delivery-2 answers both questions deterministically before a single token of code generation is spent.

1. Local .codegraph Structural Dependency Index

Whenever chinwag init or chinwag tasks sync runs locally, Chinwag builds a compact, zero-source-leak structural dependency index at .chinwag/codegraph.bin (.codegraph).

For every module, public symbol, trait, and exported TypeScript/Rust/Python interface, .codegraph records:

• In-Degree (fan_in): Number of downstream callers across the workspace.
• Out-Degree (fan_out): Number of upstream dependencies invoked.
• Transitive Test Coverage Map: Exact test targets affected when a file changes.
• Historical 7-Day Survival Score (SURV): Percentage of lines in this module that survived 7 days post-merge without emergency hotfixes.

# Inspect the structural blast radius of a proposed file scope locally (0 Cr)
chinwag tasks blast-radius --file-scope "crates/chinwag-crypto/src/hpke.rs"

[codegraph] Target: crates/chinwag-crypto/src/hpke.rs
  • Exported Public Symbols: 6 (seal_v2, open_v2, verify_dual_sig, ...)
  • Downstream Callers (fan_in): 19 modules across 4 crates
  • Blast-Radius Tier: HIGH (Core Cryptographic Boundary)
  • Mandatory Policy Floor: WP-03 (Dual-Agent Triad) + WP-11 (Crypto Review Gate)
  • Selective Test Targets: cargo test -p chinwag-crypto -p chinwag-relay -p chinwag-cli

How .codegraph Prevents Merge Cascades

When Chinwag Reflex-1 sees a ticket touching a high-fan_in file (fan_in >= 10), it automatically:

1. Rejects overlapping parallel --file-scope leases on dependent downstream modules until the upstream interface change lands.
2. Injects the exact downstream cargo test / pnpm test targets into the agent's local H1 pre-handoff hook so downstream breakage is caught in the agent's own Shadow jj workspace before review.

2. Smart Model-Tier FinOps Routing

Engineering teams frequently overspend by routing 100% of tickets · including CSS token tweaks, boilerplate CRUD endpoints, and README updates · through their slowest, highest-cost frontier reasoning tier.

Chinwag Delivery-2 analyzes each sub-task's .codegraph blast radius, estimated LOC, and historical 7-day code survival (SURV) to recommend the most cost-effective model tier that satisfies your quality floor:

3. Two-Loop Empirical Seat Selection & CI Quorum Gates (chinwag omp & chinwag-ci omp-gate)

Rather than hardcoding static model preferences that go stale whenever a frontier lab ships a new model release, Chinwag Delivery-2 (chinwag delivery enable) combines Loop 1 empirical defect-catch learning (OmpDictionaryStateV1 + 7-day SURV in .chinwag/state.crdb) with Loop 2 <5ms Coherence-Penalized Orthogonal Matching Pursuit (CP-OMP) (chinwag omp) and deterministic CI enforcement (Pillars 10 & 11 of chinwag-ci: chinwag-ci omp-gate and chinwag-ci policy-gate):

# 1. Enable Chinwag Delivery-2 autonomous seat routing & quorum sizing
chinwag delivery enable --repo .

# 2. Inspect live CP-OMP empirical dictionary & Gram-Schmidt residual risk per domain
chinwag omp status --repo . --json

# 3. Verify orthogonal quorum receipt & residual risk floor in CI (Pillar 10 of chinwag-ci, 0 Cr)
chinwag-ci omp-gate --policy chinwag.workflow.yaml --commit HEAD --json

# 4. Verify declarative workflow policy & zero-smalltalk .cwcard schema lock (Pillar 11, 0 Cr)
chinwag-ci policy-gate --policy chinwag.workflow.yaml --commit HEAD --json

Monthly FinOps Ledger & Cost Transparency

Run chinwag tasks finops at any time to inspect your organization's real-time credit velocity and model efficiency:

chinwag tasks finops --window 30d

[finops] Organization: acme-corp (Last 30 Days · 15 Developers)
  • Merged Tasks:                      184 tickets (96.2% 7-day code survival)
  • Local Free Checks (0 Cr):          4,912 runs (H1 hooks, local Shadow-KV forks, Stage 1 UI gate, Copy gate)
  • Two-Round 1:1 Handoffs (50 Cr):    1,320 convos (66,000 Cr)
  • Broken-CI Wakeup & Fix (50 Cr):    132 cycles (6,600 Cr)
  • Cross-Model Pair / Triad Runs:     198 sandboxes (132 Pair @ 100 Cr + 66 Triad @ 150 Cr = 23,100 Cr)
  • Chinwag Vision-3 16-Surface QA:    308 billed runs (220 audits @ 100 Cr + 88 auto-patches @ 200 Cr = 39,600 Cr; 81% cache hit rate across 1,621 total runs!)
  • Estimated CI Minutes Saved:        64.5 engineering hours prevented via pre-commit .codegraph checks

Next Steps

• Next: Direct <20ms CI Routing vs. ++ Triage Escalation
• Want maximum engineering velocity per credit? Reserve Your Organization Credit Pack →