# AD-003: Deepen Tracker request intake without changing control-plane semantics

- **Status:** needs-triage
- **Priority:** p1
- **Dependencies:** AD-001, AD-002
- **Evidence:** Graphify marks `_TrackerHandler` as the highest-degree node (93 edges). `do_POST` dispatches auth, accounts, billing, registry, raft, gossip, placement, calibration, model, and inference paths; `do_GET` mixes operational projections and public request paths. Major handlers include proxy chat (CC 127), registration (CC 82), models (CC 43), and network assignment (CC 42).

## Objective

Deepen Tracker request intake around existing domain seams so HTTP dispatch stays thin and request-specific policy no longer leaks across unrelated control-plane workflows.

## Constraints

- Preserve ADR-0009: Tracker remains a control plane and public inference proxy, never a model host.
- Preserve coverage-first assignment, billing, admission, relay, telemetry, Raft, and existing endpoint contracts.
- Do not create a speculative adapter: each new seam must have at least two real callers/adapters or remain internal.

## Acceptance criteria

- [ ] Characterization tests pin all affected public endpoint response and error behavior before moving code.
- [ ] HTTP dispatch delegates to cohesive intake modules for inference, node/registry lifecycle, and operator projections.
- [ ] Route selection, billing attribution, admission, and coverage logic remain backend-agnostic and do not move into the HTTP module.
- [ ] `_TrackerHandler` no longer owns unrelated endpoint policy directly.
- [ ] Existing routing, capability-admission, billing, account, and consensus tests retain behavior.
- [ ] `pytest` targeted tests and `python -m compileall packages tests` pass.

## Likely files

- Modify: `packages/tracker/meshnet_tracker/server.py`
- Potentially modify: `packages/tracker/meshnet_tracker/billing.py`, `accounts.py`, `capability.py`, `recipe.py`
- Modify/add: focused tests alongside `tests/test_tracker_routing.py`, `tests/test_tracker_capability_admission.py`, `tests/test_billing_ledger.py`, and `tests/test_tracker_consensus.py`

## Non-goals

No redesign of the Tracker architecture, no public endpoint removal, and no change to backend-neutral provider semantics.