| name | scoring |
| description | Use when scoring NL artifact quality, applying penalties, or calibrating lint judgment — contains the 100-point rubric with penalty tables per artifact type. Four worked calibration examples (Excellent Agent / Rewrite Agent / Excellent Rule / Weak Rule) live in `references/calibration-examples.md`, loaded on demand when anchoring borderline cases. |
| version | 0.3.1 |
NLPM Quality Scoring Rubric
100-point quality scale for all NL programming artifacts. Apply penalties deterministically. Use calibration examples to anchor judgment on borderline cases.
Scoring Formula
base_score = 100
adjustments = sum of all applicable penalties (all penalties are negative)
final_score = max(0, min(100, base_score + adjustments))
Penalties stack. The floor is 0; the ceiling is 100. No bonuses — the default assumption is that an artifact is well-formed, and quality is measured by what is missing or wrong.
Penalty Tables
Skills
| Rule | Check | Condition | Penalty |
|---|
| -- | name present | Missing | -25 |
| -- | name matches parent directory | Frontmatter name: value does not equal parent directory name (per nlpm:conventions §5 — open spec MUST) | -15 |
| R04 | description present | Missing | -25 |
| R04 | Trigger quality | Description is generic (≤1 specific phrase) | -15 |
| R04 | Description length | Description 500–800 chars | -5 |
| R04 | Description length | Description >800 chars | -10 |
| R05 | Body length | 400–500 lines | -5 |
| R05 | Body length | >500 lines | -10 |
| R06 | Code examples | Complex concepts with no examples | -5 |
| R06 | Code examples | No examples at all in a technical skill | -10 |
| R06 | <example> blocks | Zero <example> blocks on a user_invocable: true skill | -10 |
| R07 | Scope note | No scope note / cross-references | -3 |
Scope-note discipline: R07 means "scope note when related skills exist."
Do NOT apply R07 to missing example blocks — that is the new R06 row above
(penalty -10, not -15). The 2026-05-13 lijigang/ljg-skills audit applied
R07 + −15 fourteen times for missing example blocks; both labels were
wrong (R07 is not example-related, and -15 is the agents penalty, not
the skills penalty). The validator at auditor/scripts/validate-rule-ids.py
catches this kind of drift in CI.
name matches parent directory (added 2026-05-25, audit:
google/skills): the open Agent Skills spec at agentskills.io makes this
a MUST. Mismatch is deterministic, high-confidence, and reproducible by
single-line diff (frontmatter name: vs basename($(dirname FILE))).
Mark such findings confidence: high per the manifest-vs-disk-diff
principle in agents/scorer.md step 6. Note: this penalty did not
exist before 2026-05-25 — re-scoring past audits will yield slightly
lower scores for any corpus containing this defect, but no contribute
outcomes are retroactively affected since no PRs were ever opened
against a name-mismatch finding under the prior rubric.
Agents
| Rule | Check | Condition | Penalty |
|---|
| R09 | description present | Missing | -25 |
| R09 | <example> blocks | Exactly 1 example | -5 |
| R09 | <example> blocks | Zero examples | -15 |
| R10 | model declared | Not declared | -5 |
| R10 | model appropriate | Wrong tier for task (e.g. opus for parsing) | -5 |
| R11 | tools declared | Not declared | -5 |
| R11 | Unused tools | Each tool declared but not used in body | -3 each |
| R12 | Output format | No output format spec in body | -10 |
| R11 | Write on read-only | Audit/review/scan agent declares Write or Edit | -10 |
Commands
| Rule | Check | Condition | Penalty |
|---|
| -- | description present | Missing | -25 |
| R18 | argument-hint present | Command takes input but no hint | -5 |
| R14 | Steps numbered | Multi-step body with no numbered steps | -10 |
| R15 | Empty input handling | No handling for empty/missing input | -10 |
| R16 | Output format | No output format defined | -10 |
| R17 | Error paths | No error handling for missing files or bad data | -5 |
Shared Partials
| Rule | Check | Condition | Penalty |
|---|
| R19 | user-invocable: false | Missing or set to true | -25 |
| R20 | Purpose clear | Description doesn't state it's a partial | -10 |
Rules
| Rule | Check | Condition | Penalty |
|---|
| R21 | description present | Missing frontmatter description | -10 |
| R21 | Format: bold imperative | No bold imperative opening | -5 |
| R21 | Format: rationale | No rationale following the imperative | -10 |
| R22 | Enforceability | Rule is not specific/testable | -10 |
| R23 | Budget | Rule file over 500 lines | -15 |
| R26 | Conflicts with other rules | Direct contradiction with another rule in same set | -20 |
| R24 | Duplicates tooling | Re-states what eslint/ruff/clippy already catches | -10 |
Hooks — universal checks (apply to all tools)
| Rule | Check | Condition | Penalty |
|---|
| -- | Valid syntax | Hook config file fails to parse (JSON or TOML per tool) | -25 |
| R29 | Scripts exist | Referenced script file does not exist | -20 |
| -- | Command safety | Hook command contains dangerous patterns (rm -rf, git push --force, DROP TABLE) | -15 |
| -- | Matcher regex valid | Matcher pattern doesn't compile as valid regex | -10 |
| -- | Timeout reasonable | Hook specifies timeout > 30s (likely hangs) | -5 |
Hooks (Claude Code — Tier 2-Claude only)
Authoritative event list: nlpm:conventions-claude §7. Per the multi-tool design (analysis/multi-tool-design-2026-05.md decision #4), Claude / Codex / Antigravity hook event vocabularies are NOT 1:1 mappable — three separate tables, no translation.
| Rule | Check | Condition | Penalty |
|---|
| R27 | Event names valid (Claude) | Uses unrecognized event name — confirmed Claude events: SessionStart, SessionEnd, UserPromptSubmit, PreToolUse, PostToolUse, PermissionRequest, Stop, StopFailure, FileChanged | -15 |
| R27 | Case correct (Claude) | Event name has wrong case (e.g. pretooluse) | -10 |
| -- | Hook type valid (Claude) | Uses unrecognized type value — confirmed Claude types: command, http, mcp_tool, prompt, agent | -10 |
| -- | MCP matcher format (Claude) | Matcher targets MCP tool but doesn't use mcp__<server>__<tool> pattern | -5 |
Hooks (Codex CLI — Tier 2-Codex only)
Authoritative event list: nlpm:conventions-codex §6.
| Rule | Check | Condition | Penalty |
|---|
| R27 | Event names valid (Codex) | Uses unrecognized event name — confirmed Codex events: SessionStart, UserPromptSubmit, PreToolUse, PostToolUse, PermissionRequest, PreCompact, PostCompact, SubagentStart, SubagentStop, Stop | -15 |
| R27 | Case correct (Codex) | Event name has wrong case | -10 |
| -- | Hooks config key (Codex) | config.toml uses deprecated [features].codex_hooks instead of [features].hooks (renamed ~CLI 0.129+) | -5 (advisory) |
Hooks (Antigravity / Gemini lineage — Tier 2-Antigravity only) — ADVISORY
Authoritative event list: nlpm:conventions-antigravity §5. All Antigravity-specific hook scoring is advisory-only (confidence:low) until the Antigravity 2.0 spec stabilizes — see analysis/multi-tool-design-2026-05.md decision #3.
| Rule | Check | Condition | Penalty |
|---|
| R27 | Event names valid (Gemini lineage) | Uses unrecognized event name — confirmed events: SessionStart, BeforeAgent, BeforeModel, BeforeToolSelection, BeforeTool, AfterTool, AfterModel, AfterAgent, SessionEnd, Notification, PreCompress | -10 (advisory) |
| R27 | Case correct (Gemini lineage) | Event name has wrong case | -5 (advisory) |
plugin.json (Claude Code — .claude-plugin/plugin.json)
| Check | Condition | Penalty |
|---|
name present | Missing | -25 |
version is semver | Present but not valid semver | -10 |
description present | Missing | -5 |
.codex-plugin/plugin.json (Codex CLI — Tier 2-Codex only)
Schema reference: nlpm:conventions-codex §3.
| Check | Condition | Penalty |
|---|
| Valid JSON | File fails JSON parse | -25 |
name present | Missing | -25 |
name kebab-case | Mixed case or underscores | -10 |
version is semver | Present but not valid semver | -10 |
description present | Missing | -5 |
| Component paths relative | skills/mcpServers/apps/hooks paths absolute or missing ./ prefix | -5 each |
.agents/plugins/marketplace.json (Codex marketplace — Tier 2-Codex)
Schema reference: nlpm:conventions-codex §4. Schema is largely compatible with Claude's .claude-plugin/marketplace.json.
| Check | Condition | Penalty |
|---|
| Valid JSON | File fails JSON parse | -25 |
name present | Missing | -25 |
plugins array present | Missing or empty | -10 |
Per-plugin source valid | source.source not in github/git/local, or required repo/path missing | -10 each |
Per-plugin category present | Missing (informational, helps marketplace navigation) | -3 each |
agents/openai.yaml (Codex skill sidecar — Tier 2-Codex)
Schema reference: nlpm:conventions-codex §2.
| Check | Condition | Penalty |
|---|
| Valid YAML | File fails YAML parse | -25 |
| Sidecar is colocated | agents/openai.yaml not in same directory as a SKILL.md | -10 |
interface.display_name present | Missing | -5 (informational) |
gemini-extension.json (Gemini/Antigravity — Tier 2-Antigravity) — ADVISORY
Schema reference: nlpm:conventions-antigravity §3. All Antigravity-specific manifest scoring is advisory-only until the post-2026-06-18 Antigravity spec stabilizes.
| Check | Condition | Penalty |
|---|
| Valid JSON | File fails JSON parse | -25 |
name present | Missing | -25 |
version present | Missing | -10 |
contextFileName includes AGENTS.md | Single-tool projects use only GEMINI.md; multi-tool should include AGENTS.md | -3 (advisory; multi-tool nudge) |
.gemini/commands/*.toml (Gemini slash commands — legacy/transitional, Tier 2-Antigravity)
Schema reference: nlpm:conventions-antigravity §4.
| Check | Condition | Penalty |
|---|
| Valid TOML | File fails TOML parse | -25 |
prompt field present | Missing required field | -25 |
description field present | Missing (auto-generated from filename, but explicit is better) | -3 |
.mcp.json (Claude Code — .mcp.json at repo root)
| Check | Condition | Penalty |
|---|
| Valid JSON | File fails JSON parse | -25 |
Server command present | MCP server entry missing command field | -15 |
.codex/config.toml (Codex configuration — Tier 2-Codex)
Schema reference: nlpm:conventions-codex §5.
| Check | Condition | Penalty |
|---|
| Valid TOML | File fails TOML parse | -25 |
Deprecated [features].codex_hooks | Should be [features].hooks (renamed ~CLI 0.129) | -5 (advisory) |
Per-MCP command present | [mcp_servers.<id>] table missing command field | -15 each |
.lsp.json (Claude Code LSP — Tier 2-Claude)
Schema details: nlpm:conventions-claude §12. Stable in 2026.
| Check | Condition | Penalty |
|---|
| Valid JSON | File fails JSON parse | -25 |
monitors/monitors.json (Claude Code monitors — Tier 2-Claude)
Schema details: nlpm:conventions-claude §13. Stable in 2026.
| Check | Condition | Penalty |
|---|
| Valid JSON | File fails JSON parse | -25 |
Settings Files (.claude/settings.json, .claude/settings.local.json)
| Check | Condition | Penalty |
|---|
| Valid JSON | File fails JSON parse | -25 |
| No hardcoded secrets | Contains API keys, tokens, or passwords | -25 |
| Permission mode sanity | bypassPermissions enabled in a shared project settings file (not .local) | -15 |
| Recognized keys | Contains unknown top-level keys not in Claude Code schema | -5 each, cap -15 |
| Hook definitions valid | hooks key present — check event names valid and case-correct | -10 per invalid |
CLAUDE.md
| Rule | Check | Condition | Penalty |
|---|
| R49 | File exists | No CLAUDE.md in plugin root | -10 |
| -- | Under 200 lines | CLAUDE.md exceeds 200 lines | -5 |
| R38 | Actionable content | CLAUDE.md has no actionable guidance (just filler) | -10 |
| R33 | Build/run command | No instructions for how to build or run the project | -10 |
| R34 | Test command | No instructions for how to run tests | -5 |
| R35 | Architecture overview | No structure/component description (what lives where) | -5 |
| R36 | Valid @ imports | Contains @ import syntax referencing a file that doesn't exist | -10 |
| R37 | No stale file references | Mentions files or functions that no longer exist in the repo | -10 |
| R38 | Actionability ratio | >60% of content is description rather than instructions | -5 |
| -- | Prerequisites section | No section covering required tools, versions, or setup steps | -5 |
| R39 | No rule conflicts | CLAUDE.md says X while a .claude/rules/ file says not-X | -15 |
Memory Files
Applies to .md files located in ~/.claude/projects/*/memory/ directories.
| Rule | Check | Pass (+0) | Penalty |
|---|
| -- | Has YAML frontmatter | Present | -15 |
| -- | name in frontmatter | Present | -10 |
| -- | description in frontmatter | Present | -10 |
| -- | type in frontmatter | Present (user/feedback/project/reference) | -5 |
| -- | Content matches declared type | Yes | -10 |
| -- | Referenced in MEMORY.md index | Yes | -5 (orphaned memory) |
| R37 | Stale content | No references to removed files or functions | -10 |
Agent Workflow Programs (project-root program.md-style files)
A new artifact type recognized 2026-05-28 (see nlpm:conventions §2 and auditor/exemplars/karpathy-autoresearch.md): a project-root Markdown file driving an autonomous agent loop, hybrid between a memory file (AGENTS.md-shaped context) and a slash command (numbered workflow with output format + error paths).
No type-specific penalty rows. This artifact type is scored as the UNION of:
- Command rules R14–R17: numbered steps for multi-phase work, empty-input handling, output format, error paths.
- Memory file rules R33–R39: build/run commands, architecture overview, no stale refs, instructive-not-descriptive.
- Universal R01 (vague quantifiers) and R03 (positive framing).
Type-specific penalty rows are deferred until N ≥ 3 examples surface — the existing rules cover the artifact adequately as a hybrid, and inventing rows from N = 1 risks over-fitting (calibrated per the same discipline applied to multi-tool discovery deferrals).
Patterns this artifact type rewards (loaded on demand from nlpm:patterns):
- P10 (numeric anchoring of subjective principles)
- P11 (paired CAN/CANNOT contract)
- P12 (autonomy instruction + rationale + fallback ladder)
- P13 (vivid closing use-case)
All Artifact Types: Vague Quantifiers
| Rule | Check | Condition | Penalty |
|---|
| R01 | Vague quantifier | Each occurrence of: "appropriate", "relevant", "as needed", "sufficient", "adequate", "reasonable", "properly", "correctly", "some", "several", "various" without measurable criteria | -2 each |
| R01 | Vague quantifier cap | Total vague quantifier penalty | max -20 |
All Artifact Types: Vocabulary Drift (R51 — opt-in, disabled by default)
Applied only when R51: { enabled: true, vocabulary_skill: <path> } appears in .claude/nlpm.local.md. Without the opt-in, R51 contributes zero penalty regardless of artifact content. The configured vocabulary_skill must contain a registry.yaml listing canonical and deprecated terms; without it, R51 emits an advisory and contributes zero penalty.
| Rule | Check | Condition | Penalty |
|---|
| R51 | Deprecated synonym | Each occurrence of a term marked deprecated: in the project's registry.yaml, in the scope the artifact belongs to | -2 each |
| R51 | Drift cap | Total R51 penalty | max -10 per file |
| R51 | Missing registry | enabled: true but vocabulary_skill: not set or points to a directory with no registry.yaml | 0 (advisory only) |
Why opt-in: vocabulary discipline is high-leverage for projects with accumulated drift but premature for projects still discovering their domain. Each project decides when it has enough literary warrant (P6) to lock terms in. See analysis/vocabulary-design-principles.md for the six principles R51 operationalizes.
Cross-Component (--plugin flag)
Applied when linting an entire plugin rather than individual files.
| Check | Condition | Penalty |
|---|
| Broken partial refs | Command references commands/shared/X.md that doesn't exist | -20 |
| Broken skill refs | Agent references plugin:skill that isn't installed | -20 |
| Missing scripts | Hook references script that doesn't exist | -20 |
| Orphaned files | Agent/command/skill file not referenced by anything | -5 per file |
| Contradictions | Two rules/instructions in same plugin directly contradict each other | -15 per pair |
Score Bands
| Range | Label | Meaning |
|---|
| 90–100 | Excellent | Production-ready; minor or no issues |
| 80–89 | Good | Solid; one or two non-critical gaps |
| 70–79 | Adequate | Meets threshold; noticeable gaps to address |
| 60–69 | Weak | Below threshold; significant issues |
| <60 | Rewrite | Fundamental problems; recommend rewriting from scratch |
Default pass threshold: 70. Configurable in .claude/nlpm.local.md.
Calibration Examples
Four worked examples — Excellent Agent (95), Rewrite Agent (41), Excellent Rule (92), Weak Rule (40) — live in references/calibration-examples.md. Load that file on demand when scoring a borderline case (around band boundaries: 88-92, 68-72, 58-62) and you need an anchored reference.
The examples are not needed for routine scoring — the penalty tables above are self-contained. They were extracted from this file 2026-05-28 to keep the rubric under R05's 500-line body budget while preserving the calibration material verbatim.
Scope Note
This skill covers the NLPM scoring formula, penalty tables, score bands, and calibration examples. It does NOT cover:
- Artifact schemas and valid field values → see
nlpm:conventions (universal) and the tool-specific overlays nlpm:conventions-claude, nlpm:conventions-codex, nlpm:conventions-antigravity (the latter three created in PR-B; see analysis/multi-tool-design-2026-05.md)
- Patterns and anti-patterns catalog → see
nlpm:patterns
- How to run the score command → see
commands/score.md
Multi-tool scoring (PR-B landed 2026-05-25)
nlpm now scores artifacts across three tool ecosystems — Claude Code, Codex CLI, and Antigravity (which absorbs Gemini CLI on 2026-06-18). The tier classification in agents/scorer.md separates open-spec (Tier 1), Tier 1.5 open-spec corpora, and per-tool Tier 2 overlays (2-Claude / 2-Codex / 2-Antigravity).
- Hooks are scored per tool (Claude / Codex / Antigravity tables above). The three tools' event vocabularies are not 1:1 mappable; no universal translation layer. See
analysis/multi-tool-design-2026-05.md decision #4.
- Codex-specific artifacts scored:
.codex-plugin/plugin.json, .agents/plugins/marketplace.json, .codex/config.toml, agents/openai.yaml sidecars.
- Antigravity-specific artifacts scored (advisory-only until spec stabilizes):
gemini-extension.json, .gemini/commands/*.toml, Antigravity hook events.
- Claude-specific additions in 2026:
.lsp.json, monitors/monitors.json (validate JSON-parse only until detailed schemas land). New SKILL.md fields documented in nlpm:conventions-claude.
Known False Positive Patterns
The following findings have historically been reported by the scorer despite
having no backing in this rubric. They MUST NOT be penalized:
| Invalid finding | Why it is invalid |
|---|
Missing namespace: on skill | Not in the skill schema; conventions §5 does not list it |
Missing inline hooks:/skills: registration blocks in plugin.json | conventions §1 defines these as optional path strings |
AskUserQuestion / Task / WebFetch flagged as undocumented tool | Built-in per conventions §14 |
Agent missing skills: when omission is documented in CLAUDE.md | Intentional architectural choice |
plugin.json missing engines: / minClaudeVersion: / main: | All optional per conventions §1 |
| plugin.json description shorter than sibling marketplace.json description | Desynchronization ≠ defect; only penalize if required field is absent |
When in doubt: if a finding cannot be cited to a specific row in the penalty
tables above, drop it.
