description: Full discovery & portfolio analysis of a legacy system — inventory, complexity, debt, relative scale

argument-hint: [--show-secrets] | --portfolio
Mode select. If `$ARGUMENTS` starts with `--portfolio`, run Portfolio mode against the directory that follows. Otherwise run Single-system mode against the system dir. Parse flags positionally-independently: `--show-secrets` may appear before or after the system dir — the system dir is the first non-flag token.

Portfolio mode (`--portfolio <parent-dir>`)

Sweep every immediate subdirectory of the parent dir and produce a heat-map a steering committee can use to sequence a multi-year program.

Preferred — Workflow orchestration. If the Workflow tool is available in this session (this command invocation is your authorization), enumerate the immediate subdirectories first — the workflow script has no filesystem access — then launch one survey agent per system, all independent:

ls -d <parent-dir>/*/ | xargs -n1 basename   # bare subdir names, not paths

Workflow({
  scriptPath: "${CLAUDE_PLUGIN_ROOT}/workflows/portfolio-assess.js",
  args: { parentDir: "<parent-dir>", systems: ["<sub1>", "<sub2>", ...] }
})

This is one agent per system (a 30-system estate = 30 agents — tell the user the count before launching; the runtime queues them against its concurrency cap). Each agent returns a structured metrics row and the workflow computes COCOMO-II uniformly in code, so every row uses the identical formula. On return, render rows (plus an "unmeasured" marker row for anything in unmeasured) into the Step P4 heat-map, add the sequencing recommendation yourself, and skip Steps P1–P3. For very long sweeps, note the workflow's runId — if the session dies mid-sweep, relaunch with resumeFromRunId and completed systems return instantly from cache.

Fallback (no Workflow tool): run Steps P1–P3 per system yourself, then P4.

Step P1 — Per-system metrics

For each subdirectory <sys>:

cloc --quiet --csv <parent>/<sys>          # LOC by language
lizard -s cyclomatic_complexity <parent>/<sys> 2>/dev/null | tail -1

If cloc/lizard are not installed, fall back to scc <parent>/<sys> (LOC + complexity) or find + wc -l grouped by extension, and estimate complexity by counting decision keywords per file. Note which tool you used.

Capture: total SLOC, dominant language, file count, mean & max cyclomatic complexity (CCN). For dependency freshness, locate the manifest (package.json, pom.xml, *.csproj, requirements*.txt, copybook dir) and note its age / pinned-version count.

Step P2 — COCOMO-II complexity index

Compute the COCOMO-II basic figure per system: 2.94 × (KSLOC)^1.10 (nominal scale factors). Show the formula and inputs so it is defensible, not a guess.

Use this only as a relative complexity/scale index for ranking and sequencing systems — bigger number = bigger, more complex estate. It is not a modernization timeline or cost. The COCOMO person-month figure assumes traditional human-team productivity; agentic transformation does not follow those productivity curves, so do not present it (or convert it) as how long the work will take or what it will cost. Label the column as an index, not "person-months", and never attach a date or duration to it.

Step P3 — Documentation coverage

For each system, count source files with vs without a header comment block, and list architecture docs present (README, docs/, ADRs). Report coverage % and the top undocumented subsystems.

Step P4 — Render the heat-map

Write analysis/portfolio.html (dark #1e1e1e bg, #d4d4d4 text, #cc785c accent, system-ui font, all CSS inline). One row per system; columns: System · Lang · KSLOC · Files · Mean CCN · Max CCN · Dep Freshness · Doc Coverage % · Complexity (COCOMO index) · Risk. Color-grade the index and Risk cells (green→amber→red). Below the table, a 2-3 sentence sequencing recommendation: which system first and why.

Then stop. Tell the user to open analysis/portfolio.html.

Single-system mode

Perform a complete modernization assessment of legacy/$1.

This is the discovery phase — the goal is a fact-grounded executive brief that a VP of Engineering could take into a budget meeting. Work in this order:

Step 1 — Quantitative inventory

Run and show the output of:

scc legacy/$1

Then run scc --by-file -s complexity legacy/$1 | head -25 to identify the highest-complexity files. Capture scc's COCOMO figure only as a relative complexity/scale index — and ignore scc's "Estimated Schedule Effort" and cost-in-dollars lines: those project a human-team timeline and budget, which are invalid for agentic modernization (see the not-a-timeline note in Step 6).

If scc is not installed, fall back in order:

cloc legacy/$1 for the LOC table, then compute the COCOMO-II index yourself: 2.94 × (KSLOC)^1.10 (nominal scale factors). Show the inputs.
If cloc is also missing, use find + wc -l grouped by extension for LOC, and rank file complexity by counting decision keywords (IF/EVALUATE/WHEN/PERFORM for COBOL; if/for/while/case/ catch for C-family). Compute COCOMO from KSLOC as above.

Note in the assessment which tool was used so the figures are reproducible.

Step 2 — Technology fingerprint

Identify, with file evidence:

Languages, frameworks, and runtime versions in use
Build system and dependency manifest locations
Data stores (schemas, copybooks, DDL, ORM configs)
Integration points (queues, APIs, batch interfaces, screen maps)
Test presence and approximate coverage signal

Step 3 — Parallel deep analysis

Spawn three subagents in parallel:

legacy-analyst — "Build a structural map of legacy/$1: what are the 5-12 major functional domains (group optional/feature-gated subsystems under one umbrella), which source files belong to each, and how do they depend on each other (control flow + shared data)? Return a markdown table + a Mermaid graph TD of domain-level dependencies — use subgraph to cluster and cap at ~40 edges. Cite repo-relative file paths. Flag dangling references (defined but no source, or unused)."
legacy-analyst — "Identify technical debt in legacy/$1: dead code, deprecated APIs, copy-paste duplication, god objects/programs, missing error handling, hardcoded config. Return the top 10 findings ranked by remediation value, each with file:line evidence. If evidence contains a credential value, mask it per your secret-handling rules — never quote it."
security-auditor — "Scan legacy/$1 for security vulnerabilities: injection, auth weaknesses, hardcoded secrets, vulnerable dependencies, missing input validation. Return findings in CWE-tagged table form with file:line evidence and severity. Mask every discovered credential value per your secret-handling rules — file:line plus a 2–4 character masked preview, never the value itself."

Wait for all three. Synthesize their findings.

Step 4 — Production runtime overlay (optional)

If production telemetry is available — an observability/APM MCP server, batch job logs, or runtime exports the user can supply — gather p50/p95/p99 wall-clock for the system's key jobs/transactions (e.g. JCL members under legacy/$1/jcl/, scheduled batches, top API routes). Use it to:

Tag each functional domain from Step 3 with its production wall-clock cost and p99 variance (p99/p50 ratio).
Flag the highest-variance domain as the highest operational risk — this is telemetry-grounded, not a static-analysis opinion.

Include a small Runtime Profile table (Job/Route · Domain · p50 · p95 · p99 · p99/p50) in the assessment. If no telemetry is available, skip this step and note the gap in the assessment.

Step 5 — Documentation gap analysis

Compare what the code does against what README/docs/comments say. List the top 5 undocumented behaviors or subsystems that a new engineer would need explained.

Step 6 — Write the assessment

Secrets quarantine first. The assessment gets shared and committed — discovered credential values must never appear in it. If the security-auditor found any hardcoded credentials:

Ensure analysis/.gitignore exists and contains the lines SECRETS.local.md and *.local.patch (create or append as needed — the patch pattern is used by /modernize-harden; writing both now means the ignore set is complete from first contact). If the project is a git repo, verify with git check-ignore -q analysis/$1/SECRETS.local.md — do not write any findings until the check passes. If there is no git repo (check for .svn/.hg/CVS too — a .gitignore protects nothing under another VCS): refuse --show-secrets and write SECRETS.local.md to ~/.modernize/$1/ instead of the project tree, telling the user where it went and why.
Write SECRETS.local.md: one row per credential — masked preview, file:line, credential type, what it grants access to, production/test guess, rotation recommendation. Only if the user passed --show-secrets, add the raw value column here — this file only, never ASSESSMENT.md.
Masking applies to every section of ASSESSMENT.md, whichever agent produced the finding — the Technical Debt section quotes hardcoded config; those quotes follow the same masking rule as Security Findings. The Security Findings section adds a one-line pointer: "Credential inventory in SECRETS.local.md (gitignored; not for sharing)."

Create analysis/$1/ASSESSMENT.md with these sections:

Executive Summary (3-4 sentences: what it is, how big, how risky, headline recommendation)
System Inventory (the scc table + tech fingerprint)
Architecture-at-a-Glance (the domain table; reference the diagram)
Production Runtime Profile (the runtime table from Step 4 with the highest-variance domain called out — or "no telemetry available")
Technical Debt (top 10, ranked)
Security Findings (CWE table)
Documentation Gaps (top 5)
Relative Scale (the COCOMO-II index + KSLOC as a complexity/scale signal for ranking this system against others. Not a timeline: state plainly that this is a relative size measure, not an estimate of how long modernization will take or what it will cost — it assumes traditional human-team productivity, which agentic transformation does not follow. Do not print person-months, a schedule, a cost, or a date.)
Recommended Modernization Pattern (one of: Rehost / Replatform / Refactor / Rearchitect / Rebuild / Replace — with one-paragraph rationale, and the command it routes to: Replatform / Refactor-in-place same-stack version bump → /modernize-uplift; Rearchitect/cross-stack → /modernize-transform; Rebuild → /modernize-reimagine)

Also create analysis/$1/ARCHITECTURE.mmd containing the Mermaid domain dependency diagram from the legacy-analyst.

Step 7 — Present

Tell the user the assessment is ready and suggest: glow -p analysis/$1/ASSESSMENT.md

modernize-assess.md 11 KB Permalink Histórico Raw

Portfolio mode (--portfolio <parent-dir>)