HL — TFW-12: Config Centralization (Scope Budgets + Version String)¶

Status: 🔵 HL (draft v2) Author: Coordinator (AI) Date: 2026-03-30

1. Vision¶

Two types of values are hardcoded across many .tfw/ files:

Scope budgets (≤7 files, ≤4 new, ≤600 LOC, ≤6 modified) — in 6 live files
Version strings (TFW 0.5, 0.5.0) — in ~17 places

Changing either requires manually updating every file. TFW-11/C just demonstrated the pain: version bump from 0.4→0.5 touched 13+ files.

Goal: define both in PROJECT_CONFIG.yaml as single source of truth. All other files reference the config, not hardcode values. When a project bumps version or adjusts budgets, one YAML edit propagates everywhere.

2. As-Is¶

Scope Budgets — hardcoded in 6 live files¶

File	Occurrences
`.tfw/conventions.md` (§6)	4 values: ≤7, ≤4, ≤600, ≤6
`.tfw/README.md` (§Scope Budgets)	4 values (duplicate)
`.tfw/workflows/plan.md` (§Scope Budget)	4 values (duplicate)
`.tfw/glossary.md` (Phase def)	3 values inline
`.tfw/templates/TS.md`	3 values inline
`README.md` (root, Key Concepts)	2 values inline

Version Strings — hardcoded in ~17 places¶

File	Content
`.tfw/VERSION`	`0.5.0` — this stays (machine-readable)
`.tfw/PROJECT_CONFIG.yaml`	`tfw.version: "0.5.0"` — this is the source
`.tfw/conventions.md` L1	`# TFW 0.4 — Conventions` ← stale
`.tfw/glossary.md` L1	`# TFW 0.4 Glossary` ← stale
`.tfw/README.md` L151, L166, L209	`TFW 0.5 enforces...`
`.tfw/init.md` L1, L196	`# TFW 0.5 — Quick Start`
`.tfw/adapters/claude-code/CLAUDE.md.template` L15-16	`TFW 0.5`
`.tfw/adapters/cursor/tfw.mdc.template` L2, L6	`TFW 0.5`
`.tfw/adapters/antigravity/tfw-rules.md.template` L5	`TFW 0.5`
`.tfw/adapters/antigravity/README.md` L34	`TFW 0.4` ← stale
`CLAUDE.md` L1, L5	`TFW 0.5`
`README.md` (root)	`Current version: 0.5.0`

Current PROJECT_CONFIG.yaml¶

tfw:
  version: "0.5.0"
  # no scope_budgets section

3. To-Be¶

PROJECT_CONFIG.yaml — single source of truth¶

tfw:
  version: "0.5.0"
  scope_budgets:
    max_files_per_phase: 7
    max_new_files: 4
    max_loc: 600
    max_modified_files: 6

Version strings → reference¶

Before (conventions.md):

# TFW 0.4 — Conventions

After:

# TFW Conventions

Drop the version from titles entirely. The version is tracked in PROJECT_CONFIG.yaml and VERSION file. Having it in document titles creates drift (proven by TD-25: conventions/glossary still say 0.4 after bump to 0.5).

Adapter templates — use placeholder:

# TFW {version}

Agent reads version from PROJECT_CONFIG.yaml when instantiating.

Root README — reference:

- **Current version**: see `.tfw/VERSION` — [changelog](.tfw/CHANGELOG.md)

Scope budgets → reference¶

Same pattern as HL v1: replace hardcoded values with references to PROJECT_CONFIG.yaml.

4. Principles¶

One truth — numbers and version live ONLY in PROJECT_CONFIG.yaml (+ VERSION file for machine-readable semver)
VERSION file stays — tfw-release workflow reads it, tfw-update reads it. It's the machine-readable canonical source, PROJECT_CONFIG mirrors it.
No version in titles — removes the #1 source of drift. Titles become version-agnostic.
Trace integrity — historical task artifacts never modified.
Adapter templates use placeholders — {version} resolved on copy by init.md instructions.

5. Phases¶

Phase A: Config + Scope Budgets¶

Add scope_budgets section to PROJECT_CONFIG.yaml. Update canonical definition in conventions.md (§6). De-duplicate from README, plan.md, glossary.md, TS.md template, root README.

Files: PROJECT_CONFIG.yaml, conventions.md, .tfw/README.md, plan.md, glossary.md, TS.md template, root README.md Budget: 0 new, 7 modified

Phase B: Version String Cleanup¶

Remove hardcoded version from titles in core files. Update adapter templates with {version} placeholder. Fix stale 0.4 references (TD-25). Update init.md instructions.

Files: conventions.md, glossary.md, .tfw/README.md, init.md, 3 adapter templates, antigravity README, CLAUDE.md, root README Budget: 0 new, ~10 modified (mechanical one-line edits)

6. DoD¶

[ ] tfw.scope_budgets exists in PROJECT_CONFIG.yaml with 4 values
[ ] grep ≤ 7|≤ 4|≤ 600|≤ 6 in .tfw/ returns 0 hardcoded values
[ ] No TFW 0.X in document titles (conventions, glossary, README)
[ ] Adapter templates use {version} placeholder
[ ] init.md instructs user to set version from PROJECT_CONFIG
[ ] TD-25 resolved (conventions/glossary title fix)
[ ] No changes to tasks/ (historical integrity)

7. DoF¶

Hardcoded budget/version values remain in any live .tfw/ file
Historical task artifacts modified
VERSION file removed or disconnected from PROJECT_CONFIG
Version appears in document titles

8. Risks¶

Risk	Mitigation
Titles without version less informative	VERSION file + PROJECT_CONFIG are the canonical sources; titles link to them
Agent confusion during template instantiation	init.md documents the `{version}` replacement step
Downstream projects miss scope_budgets config	init.md example shows it; tfw-update flags new fields

HL — TFW-12: Config Centralization (Scope Budgets + Version String) | 2026-03-30