adr-backfill

adr-backfill is a skill for Claude Code, Codex from liza-mas/liza. It costs 13 tokens per session (3,894 once invoked), scanned A, original, Apache-2.0.

A method for reconstructing Architecture Decision Records, or ADRs, from a project’s commit history and documentation. An ADR records an important technical choice and why it was made.

In plain words
What is it for?
Use it to find architectural changes, group related commits into decisions, add supporting documentation, and create dated ADRs.
Why use it?
Important design decisions are often buried in old commits, specifications, and docs. This process brings those decisions together and fills in missing context.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

Good fit Use it to find architectural changes, group related commits into decisions, add supporting documentation, and create dated ADRs.

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Install with agentmods
npx agentmods add skills/liza-mas/liza/adr-backfill
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent
npx skills add liza-mas/liza --skill adr-backfill
Clone the repo
git clone --depth 1 https://github.com/liza-mas/liza

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for adr-backfill

README.md
[![agentmods](https://agentmods.dev/badge/skills/liza-mas/liza/adr-backfill/github.svg)](https://agentmods.dev/skills/liza-mas/liza/adr-backfill)
Your own site
<a href="https://agentmods.dev/skills/liza-mas/liza/adr-backfill"><img src="https://agentmods.dev/badge/skills/liza-mas/liza/adr-backfill/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for adr-backfill

Your own site · 80×15
<a href="https://agentmods.dev/skills/liza-mas/liza/adr-backfill"><img src="https://agentmods.dev/badge/skills/liza-mas/liza/adr-backfill.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 13 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 3,894 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits
  • NVIDIA SkillSpector pass 7 Sept 2026
How audits are shown
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00013 $0.03894
Opus 5 $0.00006 $0.01947
Sonnet 5 $0.00003 $0.00779
Haiku 4.5 $0.00001 $0.00389

Measured 11d ago against content hash d67dc935c0f2, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

adr-backfill scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 11d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

skills/adr-backfill/SKILL.md · 472 lines

How it starts

The opening of the file, as written. The whole thing — 472 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Objective

Reconstruct Architecture Decision Records from a repository's git history and documentation. You're doing archaeology — finding the decisions buried in commits, specs, and docs, then surfacing them as ADRs.

An ADR is warranted when someone made a choice that shaped the system. Not every commit is a decision. Your job is to find the ones that were.

Process

  1. Classify files — Distinguish architectural files (where decisions manifest) from supportive files (tests, utils). Persist this classification.

  2. Identify candidate commits — Find commits that touch architectural files with structural changes (not just edits).

  3. Cluster into decisions — Group related commits that represent a single decision being implemented.

  4. Fill gaps — Pull in minor commits (typo fixes, forgotten files) that belong to a cluster but were filtered out.

  5. For each cluster — Analyze intent, ask the user for context, generate the ADR.

  6. Scan complementary sources — Check specs/ and docs/ for decisions not captured by commits.

  7. Enrich ADRs — Add cross-references, diagrams, and implementation notes from related documentation.

  8. Order chronologically — Renumber ADRs to maintain chronological sequence.

  9. Update ADR index — Keep specs/architecture/ADR/README.md in sync after any ADR is added, removed, or renumbered.

Maintain state in files so work isn't lost if the conversation ends.

1. File Classification

Consider all files - present and deleted. Deletion may reveal an architectural decision.

Architectural (decisions live here)

Tier 0 — Dependency manifests (highest signal)

  • requirements.txt, pyproject.toml, package.json, go.mod, Cargo.toml
  • Every addition/removal is a technology choice

Tier 1 — Infrastructure & deployment

  • Dockerfile, docker-compose*.yml, CI configs, terraform, k8s manifests
  • How the system runs and deploys

Tier 2 — Domain structure

  • Core modules, domain boundaries, entry points, service definitions
  • The shape of the system

Read the full file on GitHub · 472 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 11d ago First seen · 472 lines · 13 tokens per session scan A d67dc935c0f2

Subscribe to this mod's changes

adr-backfill is a skill published in the GitHub repository liza-mas/liza (384 stars, last pushed 2d ago), licensed Apache-2.0. It adds 13 tokens to every session and 3,894 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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