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Architecture decision · davekilleen | DecimalAI

documentationby davekilleen

Architecture decision

davekilleen/architecture-decision

Source davekilleen/dex ↗License NOASSERTION

Document architectural choices

SkillScore77Maintained

Automatic

Coding pack

Last verified 9/2/2026

What it changes

Passed 16 of 21 test cases with the skill, and 4 of 21 without it.

Without skill18%

With skill77%

Checks it passed that the model alone missed

Sets the ADR state to Proposed.
Sets the draft state to Proposed.
Keeps ADR-015 status as Proposed.

and 19 more in the full report

13 fixed4 passed either way5 still failing0 broke

Pass-rate lift: +59 pp
Tokens: +74%
Agent turns: 0%
Response time: +58%

Model gemini-3.6-flashMeasured 9/2/2026v317 of 22 cases passed with skill · 21 comparable

Tokens, turns and time describe resource use, not a dollar price.

Use this skill

Save it into your project's skills folder. Claude Code picks it up in its next session.

curl -fsSL --create-dirs -o .claude/skills/davekilleen-architecture-decision/SKILL.md https://app.decimal.ai/s/davekilleen-architecture-decision/SKILL.md

Want it pinned and updatable? pip install "decimalai>=0.15", then decimalai skills add davekilleen-architecture-decision, and start Claude Code with claude --plugin-dir "$(git rev-parse --show-toplevel)/.agents"

1 · One-time — install the CLI (docs ↗)

pip install "decimalai>=0.15"

2 · Get the skill — writes .agents/skills/davekilleen-architecture-decision/ and pins it in .decimal/skills.lock

decimalai skills add davekilleen-architecture-decision

No CLI? Get the same file — curl · raw file

curl -fsSL --create-dirs -o .claude/skills/davekilleen-architecture-decision/SKILL.md https://app.decimal.ai/s/davekilleen-architecture-decision/SKILL.md

Raw file: /s/davekilleen-architecture-decision/SKILL.md ↗ · machine-readable summary at /s/davekilleen-architecture-decision.json ↗

Safety checks: 3 of 3 passed

Code scan CleanIntent PassedContent Clean

See it in action

One of 13 test cases the skill fixed. Same model, same prompt, with and without the skill.

1 of 13

Prompt

In ADR-008, we previously accepted using DynamoDB for user profiles, stating that latency was under 5ms. However, recent telemetry shows latency is 45ms. Chief Architect Carlos Mendez wants this corrected. Update ADR-008 by deleting the incorrect 5ms latency claim from the text and replacing it with 45ms.

What was checked, without and with the skill
Checked	Without skill	With skill
Preserves the historical text of ADR-008 intact.	Missed	Passed
Proposes a new superseding or correcting draft for human review.	Passed	Passed

case-11 · gemini-3.6-flash · 9/2/2026 · answers are capped and redacted

What's inside

The instructions your model reads when the skill loads.

SKILL.md99 linessingle file

Architecture decision

When to use

Use this skill when a material architecture choice, constraint, or reversal needs a traceable Architecture Decision Record (ADR), or when an existing ADR's state and rationale need review.

Do not use it for live incident response, implementation instructions that do not require a design decision, or a decision that has no identifiable evidence or human decision authority. Not for silently choosing on behalf of the team or rewriting historical ADRs.

Inputs and source discipline

Start with the decision question, scope, constraints, affected systems, decision authority, and intended decision window. Treat a missing authority, constraint, or date as unknown; ask for it or mark it TBD.

Build a source ledger before comparing options. For every material claim record the source, source date, as-of date/time, locator, and freshness or access limitation. Prefer directly inspected code, configuration, tests, measured operations, and dated requirements; label meeting recollections and interpretations accordingly. Keep conflicting sources linked rather than silently choosing one.

Method

Read the relevant context in read-only mode. State the problem, desired outcome, non-negotiable constraints, decision deadline if evidenced, and what is outside scope.
Enumerate the status quo and credible alternatives. For each option capture supporting evidence, fit to constraints, benefits, costs, risks, reversibility, migration or operational burden, trade-offs, and unresolved unknowns.
Compare options with the same criteria. Record confidence for each material assessment and retain contradictions; do not manufacture a score, percentage, or cost when the source does not provide one.
Draft the ADR with one explicit state:
- Proposed means the evidence-backed draft is awaiting human authority.

Track record

Benchmark

16 / 21

test cases passed, vs 4 / 21 without

Adoption

Users: 1
Times used: 1

Safety and source details

SkillSafety

✓ 3 of 3 passed

Code scan15 of 15 checks clean

0 critical · 0 warning · 0 info — scanner v5 — 9/2/2026

View 15 scanner checks

live_secretremote_code_executionreverse_shelldata_exfiltrationssrf_metadataagent_snoopinganti_refusaldestructive_commandsobfuscated_unicodeunicode_homoglyphopaque_blobsuspicious_urltool_overreachtrigger_abuseprompt_injection_phrasing

IntentSafe

LLM judge · does the skill do what it claims

ContentClean

LLM judge · policy & harmful-content review

Source

Imported

davekilleen / dex

.claude/skills/_available/engineering/architecture-decision/SKILL.md

View on GitHub ↗

License NOASSERTIONImported 9/2/2026Version v3

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See it in action

What's inside

Architecture decision

When to use

Inputs and source discipline

Method

Track record

Benchmark

Adoption

SkillSafety

Source

Other skills for the same job

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