Harden schema-pointer generator follow-ups

[bokelley]

Follow-up from PR #150 after adding schema-pointer generation for media-buy helper types.

Non-blocking improvements:

• Make generate.py resolve schema refs relative to the script directory instead of cwd, matching lint.py. Today the documented invocation is cd adcp/schemas && python3 generate.py, but a future test harness from repo root would silently downgrade refs to any.
• Add TypeError to schema pointer/ref resolution catch tuples in generate.py and lint.py, so pointer walks into scalar values report clean drift errors instead of tracebacks.
• Document or normalize the INLINE_TYPE_HINTS convention for pointer-prefixed hints such as *DeliveryAggregatedTotals.
• Consider extracting shared JSON Pointer/schema-spec helpers once there is a third consumer.
• Add a Go round-trip test for populated MediaBuyDelivery / PackageDelivery values.
• Sweep MIGRATING.md for the full cascade of any to typed narrowings unlocked by primitive $ref passthrough, including GetProductsRequest.TimeBudget, CreateMediaBuyRequest.StartTime, DeliveryTotals.ReachUnit, and typed delivery response fields.

[bokelley]

Triage

Classification: Mixed — bug/non-security (items 1–2), docs (item 3, 6), new test (item 5), deferred design (item 4)
Bucket(s): docs, tmpclient (labels not found in repo — gap noted in run summary)
Status: ready-to-implement (items 3, 5, 6) · fold-candidate into #135 (items 1–2) · deferred (item 4)

What the experts said:

• code-reviewer: Items 1–2 are real correctness bugs and safe folds into feat(codegen): propagate JSON Schema deprecated:true as // Deprecated: doc comment #135; item 5 test should assert zero-value required fields (PricingModel, Rate) to guard against accidental omitempty; item 6 needs a git-history verify before writing — some named fields may not have been any pre-feat(adcp)!: generate media-buy schema helpers #150.
• security-reviewer: All six items clear TEE-bound paths; item 1 actually tightens the sandbox — SCRIPT_DIR-anchored containment in resolve_ref_schema is stricter than the current cwd-anchored bound.
• docs-expert: Item 3 needs a 4–6 line comment block (not a one-liner) explaining both the pass-through mechanism and the policy for when * applies; item 6 should be three targeted bullets rather than full field enumeration, focused on pointer semantics for AggregatedTotals, still-any carve-outs (ByEventType/ByActionSource), and the ReachUnit enum-alias gap.

My take: Items 1–2 are a natural fold into the already-open draft PR #135 (same author, same file). Items 3, 5, 6 are independently safe and ready for a follow-up PR; item 4 is deferred until a third consumer exists (lint.py already imports generate and can call gen.json_pointer_get directly if a cleanup is ever warranted).

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Items 1–2 — fold into #135 before merge

Blocked-on: #135 — resurfaces on merge

These belong in #135's diff rather than a separate PR:

• Item 1 (adcp/schemas/generate.py:396-397): replace root = Path.cwd().resolve() with root = SCRIPT_DIR (add SCRIPT_DIR = Path(__file__).resolve().parent at module top, matching lint.py). Also fix the bare relative paths in _will_generate_set's os.path.exists(rel) calls (lines ~503/506) and update the stale cwd reference in _reset_will_generate_cache's docstring.
• Item 2 (generate.py:404, 507, 516, 738 and lint.py:229, 309): add TypeError to all five catch tuples — a pointer walk into a scalar raises TypeError: string indices must be integers, which currently produces a traceback rather than a clean drift error.

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Items 3, 5, 6 — implementation brief

Scope: adcp/schemas/generate.py, adcp/ test file, MIGRATING.md. No TEE-bound paths, no breaking API changes.

• Item 3 — INLINE_TYPE_HINTS comment (adcp/schemas/generate.py:321): add a 4–6 line block above the dict explaining (1) hint values starting with * are emitted verbatim as the Go type (the automatic $ref-based pointer-wrapping logic in schema_to_struct does not apply when a hint is taken), and (2) * is the correct choice when a field is optional and its type is derived from INLINE_SCHEMA_TYPES rather than a $ref target, because the automatic wrapping only fires on $ref properties.
• Item 5 — Go round-trip test (adcp/ package, alongside inputs_test.go): marshal and unmarshal populated MediaBuyDelivery and PackageDelivery values; include an assertion that schema-required fields (PackageDelivery.PricingModel, PackageDelivery.Rate) survive a zero-value round-trip without being silently dropped (guarding against accidental omitempty on required fields).
• Item 6 — MIGRATING.md addendum (targeted addition to the existing "Next" section): three bullets — (a) pointer semantics for GetMediaBuyDeliveryResponse.AggregatedTotals (nil means absent, not zero); (b) DeliveryTotals.ByEventType and ByActionSource remain []any (not narrowed by PR feat(adcp)!: generate media-buy schema helpers #150); (c) reach_unit delivery-total fields are string, not the ReachUnit enum alias. Verify pre-feat(adcp)!: generate media-buy schema helpers #150 git history for TimeBudget/StartTime before including them — those may have been typed before feat(adcp)!: generate media-buy schema helpers #150.

Required checks: go test ./... (root + adcp/ module) · cd adcp/schemas && python3 lint.py --strict · go build ./... · go vet ./....
Non-breaking: new comment, new test coverage, doc addendum only — no exported API changes.

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Item 4 — deferred

No third consumer exists yet. When one arrives, lint.py already imports generate and can call gen.json_pointer_get / gen.load_schema_spec directly — that is a free de-duplication requiring no new module boundary.

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Triaged by Claude Code. Session: https://claude.ai/code/cse_01Y3MmzgEj2mxK4G7rN5NQyk

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Generated by Claude Code