Optimization: This skill uses on-demand loading. Heavy content lives in references/ and is loaded only when needed. Language rule: Skill instructions are written in English.

When generating user-facing output (reports, files, documentation), detect the project's primary language (from README, comments, docs, commit messages) and produce the output in that language. If the project is bilingual, ask the user which language to use before proceeding.

Diacritics rule: When the chosen output language uses diacritics (French, Spanish, Portuguese, etc.), render them correctly — including on capitals (É, À, Ç, Ô…). Never strip accents to ASCII: write "sécurité" not "securite", "Rôle" not "Role". ASCII-flattened French is a defect, not a style.

Writing style: Favor clarity — short sentences, one idea per sentence, plain words. A metaphor only when it clarifies. Keep one consistent register (impersonal/infinitive for operational docs). Separate narrative prose, meant to make the reader understand, from telegraphic content (tables, commands, checklists) which stays terse for action.

No fabricated output: Never invent command output, console captures, API responses, metrics, or logs. When real output is needed, emit a clearly-marked placeholder (🚧 "replace with a real capture"), never plausible-but-fake text presented as real.

Memorability (rule of three): For short lists an operator must internalize (incident reflexes, level missions, checklists), add a three-part memory hook above the list (e.g. "Capture → Stay on the rails → Verify"), keeping the detailed items underneath. Use sparingly — only where recall matters under stress, never on reference tables.

Forge Resilience — Prod-Parity, Failure Biology & Runbooks

"A system survives production when it keeps homeostasis under stress, not when it merely passes happy-path tests."

Core Principle

Treat the system as an organism in an environment, not as a pile of files.

Production bugs usually appear when one of these mismatches exists:

• Genome mismatch — contracts, ports, tags, secrets, roles, paths, or policies exist in multiple conflicting places.
• Membrane mismatch — dev/staging do not reproduce the real boundary conditions of production.
• Homeostasis illusion — the system looks healthy in one path, but another access path, operator path, or degraded state is broken.
• Immune weakness — only happy-path tests exist, so negative cases, corrupted inputs, and drift survive until production.
• Hysteresis — reruns, rollbacks, or partial failures leave dirty state behind (stale volume, cache, label, secret, ACL, artifact).
• Memory loss — the incident is fixed once but never translated into a runbook entry, mutation test, or anti-regression guardrail.

Read references/models.md for the full biology + physics mapping.

Intent Routing

Input

$ARGUMENTS can be:

• a repository root or service directory
• a system name or short description
• an incident document, runbook, troubleshooting guide, or postmortem
• empty, in which case you auto-discover from the current project

Input Discovery

1. Detect output language first: git log --oneline -10 + head -20 README.md
2. Glob docs: README*, docs/**/*, TROUBLESHOOTING*, RUNBOOK*, OPERATIONS*, INCIDENT*, POSTMORTEM*, BLACKBOX*
3. Glob tests: tests/**, test/**, spec/**, e2e/**, smoke/**, chaos/**
4. Glob deploy/runtime assets: Dockerfile*, Containerfile*, compose*, helm*, k8s/**, manifests/**, deploy/**, systemd/**, quadlet/**, *.service
5. Glob CI assets: .github/workflows/*, .gitlab-ci.yml, Jenkinsfile, .circleci/**
6. Read manifests/config: package.json, Cargo.toml, go.mod, pyproject.toml, .env*, *.yaml, *.yml, *.json, *.toml
7. Search for operator wrappers and diagnostic entrypoints: scripts/**, bin/**, aliases, helper CLIs, make, justfile
8. Search for explicit contracts: image refs, ports, secrets, roles, schemas, migrations, registries, health endpoints, backup/restore commands

The 8 Living-System Models

Read references/models.md when you need the detailed definitions, failure smells, and test ideas.

Workflow

Step 1 — Map the failure surfaces

Create a surface map. Minimum surfaces:

• build / packaging / image
• config / contracts / env rendering
• secrets / identity / roles
• deploy / orchestration / fresh install
• network / ports / ingress / service discovery
• storage / ownership / permissions / labels / persistence
• runtime startup / health / logs
• operator wrappers / CLIs / commands
• monitoring / alerts / smoke checks
• backup / restore / migrations / rollback
• CI / release / scanner gates
• docs / examples / commands / aliases

For each surface, capture:

| Surface | Primary source of truth | Typical prod failure | First discriminating probe | Blast radius |

Step 2 — Extract the genome and invariants

Build an invariant table. Every critical behavior must map to one authoritative source.

Examples of invariants:

• exact image reference or artifact identity
• exact secret source and render path
• exact published port and internal bind/listen address
• exact role / ACL / auth path
• exact storage layout and ownership
• exact health endpoint / startup signal
• exact backup / restore command
• exact CI gate for deploy-affecting changes

For each invariant, record:

| Invariant | Source of truth | Where else it appears | Drift risk | Verification command |

Rule: if the same operational fact is manually duplicated in multiple places, flag it as Genome Drift.

Step 3 — Build the prod-parity membrane

Create a Prod-Parity Matrix. Compare Observed Dev/Staging vs Expected Prod across these axes:

Rules:

• Never say "prod-like" without naming the boundary conditions that actually match.
• Controlled deviations are acceptable only if explicitly listed with risk and compensating tests.
• If no prod exists yet, define the target membrane the future prod must satisfy.

Step 4 — Derive the test ladder

Read references/test-ladder.md for the full ladder, examples, and escalation rules. The rung semantics are shared across skills (oci, pipeline, audit-test) in ../shared/gate-ladder.md; this skill's biology names map onto those rungs. Reproducibility/idempotency techniques (T3 reruns, mutation baselines) are shared in ../shared/determinism.md.

Use this ladder:

• T0 — Genome tests: static contract tests, render checks, lint, schema validation, policy checks
• T1 — Organelle tests: image build, component smoke, service-internal tests
• T2 — Tissue tests: fresh deploy on clean prod-like host/environment
• T3 — Organism tests: operations, rerun/idempotency, operator path, external client path, monitoring, backup/restore
• T4 — Immune tests: negative tests, degraded mode, chaos, mutation tests, failover, threshold tests
• M0 — Memory: runbook update, blackbox entry, closure criteria, durable guardrail

For every relevant surface, generate two things:

1. the minimum tests to rerun when that surface changes
2. the broader matrix that must be rerun when blast radius is cross-cutting

Step 5 — Create the mutation and chaos battery

Read references/mutations.md for a ready-to-use mutation catalog.

For each critical contract, design at least one "break it on purpose" test:

Mutation rule: if more than two mutations pass silently, the operational safety net has holes.

Step 6 — Generate the troubleshooting runbook

Read references/runbook-template.md before writing.

The runbook MUST include:

1. Capture before correction — exact evidence to save before editing anything
2. Fast triage — the shortest path to the first discriminating signal
3. Decision tree — startup vs runtime vs access-path vs data-path vs monitoring-path
4. Operator path vs external path — always separate them
5. Rollback / containment — how to stop blast radius without hiding evidence
6. Anti-regression reruns — what to rerun after the fix
7. Closure criteria — when the incident is truly closed
8. Agent readiness — support tier, autonomy level, capability contracts, approval boundary, and escalation bundle

If the user mentions support levels, N1/N2/N3, L1/L2/L3, agent execution, autonomous remediation, MCP tools, or regulated operations, read references/agent-ops.md and generate an operations pack in addition to the human runbook.

Step 7 — Capitalise memory

If incident docs or blackboxes already exist:

• map each incident to its missing durable guardrail
• detect repeated confusion patterns ("wrong path", "wrong env", "wrong role", "wrong secret", "wrong runtime assumption")
• propose the exact anti-regression test, runbook delta, and source-of-truth correction

If they do not exist, generate starter templates for:

• incident blackbox entry
• recurring hurdle / integration confusion entry
• pre-deploy checklist
• post-deploy smoke checklist

Step 8 — Score resilience

Read references/scoring.md for the detailed 15-dimension framework. The score (≥ 45/60 + mutation tests pass) is this skill's post-verification gate — the 3-phase definition-of-done structure (pre → during → post) is canonical in ../shared/done-gate.md.

Score each dimension 0–4:

Target score: > 45/60 (75%) for a production-bound system.

Step 9 — Produce a prioritized action plan

Use 3 tiers (tier semantics are canonical in ../shared/triage.md — Tier 3 = critical / Tier 2 = major / Tier 1 = minor, independent of GRADE confidence):

• Tier 3 — Critical: false green in CI, missing runtime proof, data-loss risk, auth drift, secret drift, deploy non-idempotency, hidden path mismatch
• Tier 2 — Major: parity gaps, weak observability, missing degraded-mode tests, incomplete runbook, backup/restore not proven
• Tier 1 — Minor: documentation polish, naming cleanup, low-risk UX improvements

Each item must include:

| # | Finding | Tier | Surface | Why it matters in prod | Minimum fix | Minimum rerun |

Output Format

# Resilience Blueprint — {system}
**Date:** {date}
**Target:** {repo/path/system}
**Mode:** {full blueprint | runbook only | parity only | blackbox delta}
**Resilience Score:** {X}/60 — {verdict}

## 1. Failure Surface Map
| Surface | Source of Truth | First Probe | Blast Radius | Notes |

## 2. Prod-Parity Matrix
| Axis | Observed | Expected in Prod | Gap | Risk | Fix |

## 3. Test Ladder
### T0 — Genome
### T1 — Organelle
### T2 — Tissue
### T3 — Organism
### T4 — Immune
### M0 — Memory

## 4. Mutation & Chaos Battery
| Mutation | Expected Signal | Silent Pass Means | Level |

## 5. Troubleshooting Runbook
### Capture Before Correction
### Fast Triage
### Decision Tree
### Rollback / Containment
### Anti-Regression Reruns
### Closure Criteria

## 6. Agent Operations Pack
### Support Tier Matrix
### Agent Autonomy Policy
### Capability Contracts
### Approval and Escalation Boundaries

## 7. Incident Memory / Blackbox Delta
| Incident or Recurrent Hurdle | Missing Guardrail | Add This Test | Add This Runbook Step |

## 8. Dimension Scores
| # | Dimension | Score | /4 | Evidence | Gap |

## 9. Action Plan
### Tier 3 — Critical
### Tier 2 — Major
### Tier 1 — Minor

Mandatory Rules

1. Never confuse operator path with external user path. Test both when relevant.
2. Never say a change is safe because the image or static config passed. Runtime qualification wins.
3. If reruns are part of operations, rerun/idempotency is a first-class test.
4. Always capture the first useful signal before editing the system.
5. Every fix must end in a durable guardrail: a test, a gate, a runbook delta, or a blackbox entry.
6. Do not hide parity gaps. List them explicitly, even if the answer is "accepted risk".
7. A working happy path is not enough. Include at least one negative or degraded-mode test per critical surface.
8. If a `../gotchas.md` file exists, read it before producing output to avoid repeating known mistakes.

Dynamic Handoffs

Rule: recommend handoffs, do not auto-execute them unless the user explicitly asks.