Subagent

Spec Analyzer

Analyze specification artifacts for consistency, coverage, and quality

Type: Subagent
Repository: athola/claude-night-market
GitHub stars: 339
License: MIT
Repo last updated: Sep 24, 2026
Source file: plugins/spec-kit/agents/spec-analyzer.md
Model: opus

What Spec Analyzer is

Spec Analyzer is a subagent published in the athola/claude-night-market repository on GitHub, which has about 339 stars. The repository describes itself as: “23 Claude Code plugins: TDD enforcement hooks, git/PR workflows, spec-driven development, code review, project lifecycle, fix-from-error, maintenance automation, context optimization, research, and multi-LLM delegation. 186 skills, 128 commands, 54 agents.”

A subagent is a specialist assistant that Claude can hand part of a task to. It is a markdown file whose frontmatter sets a name, a description that tells Claude when to delegate, and optionally the tools and model it may use; the body becomes the subagent's own system prompt.

Because a subagent works in its own context, it keeps the main conversation focused: Claude can send a narrow job, such as a review or a specialised analysis, to Spec Analyzer and get back a compact result.

How to install Spec Analyzer

Claude Code

Download spec-analyzer.md from the repository.
Save it to ~/.claude/agents/ to use it in every project, or to .claude/agents/ inside one project to share it through version control.
Claude Code watches these folders, so the subagent is usually available right away. Ask Claude to use it by name, or @-mention it to make sure it runs.

Claude Cowork

Cowork loads subagents through plugins. If the repository is packaged as a plugin marketplace, add it under Customize → Plugins → Add marketplace and install the plugin that contains this subagent.
Otherwise, bundle the file into your own plugin's agents/ folder and upload it from Customize → Plugins.

New to extending Cowork? Our plugins guide and Customize guide explain how skills, plugins, and connectors fit together.

Inside the source file

An excerpt from plugins/spec-kit/agents/spec-analyzer.md, shared under the repository's MIT license. Read the full file on GitHub.

Analyzes specification artifacts for consistency, coverage, and quality issues.

Capabilities

Cross-artifact consistency checking (spec.md, plan.md, tasks.md)
Requirement coverage analysis
Ambiguity and underspecification detection
Constitution alignment validation
Terminology drift identification
Duplicate requirement detection

Analysis Categories

Consistency Checks

Terminology consistency across artifacts
Data entity alignment between spec and plan
Task ordering matches dependency requirements

Coverage Analysis

Requirements with zero associated tasks
Tasks without mapped requirements
Non-functional requirements coverage

Quality Metrics

Ambiguity detection (vague terms without measurable criteria)
Duplicate/near-duplicate requirements
Unresolved placeholders (TODO, ???, TKTK)

Severity Classification

CRITICAL: Constitution violations, missing core requirements, zero coverage
HIGH: Conflicting requirements, security/performance ambiguities
MEDIUM: Terminology drift, missing edge cases
LOW: Style improvements, minor redundancy

Output Format

Returns structured analysis report with:

Findings table (ID, Category, Severity, Location, Summary, Recommendation)
Coverage summary
Metrics (total requirements, coverage %, issue counts)
Next actions

Usage

Provide the feature directory path:

Analyze the specification at .specify/specs/feature-name/

Before you install

Read the whole file first. Skills, commands, and subagents are instructions Claude will follow, so make sure they match what you want.
Check which tools, scripts, or MCP servers it uses. Local servers and scripts run with your permissions.
Try it in a test project or a copy of your files before pointing it at real work.
Pin the version you tested, and review changes before updating.
Watch for instructions that fetch web content or run shell commands; those are where prompt injection risks start. See our prompt injection guide.

FAQ

What is Spec Analyzer?

Spec Analyzer is a subagent for Claude Code and Claude Cowork from the athola/claude-night-market repository on GitHub. Analyze specification artifacts for consistency, coverage, and quality

How do I install Spec Analyzer in Claude Code?

Download spec-analyzer.md from the repository. Save it to ~/.claude/agents/ to use it in every project, or to .claude/agents/ inside one project to share it through version control. Claude Code watches these folders, so the subagent is usually available right away. Ask Claude to use it by name, or @-mention it to make sure it runs.

Can I use Spec Analyzer in Claude Cowork?

Cowork loads subagents through plugins. If the repository is packaged as a plugin marketplace, add it under Customize → Plugins → Add marketplace and install the plugin that contains this subagent. Otherwise, bundle the file into your own plugin's agents/ folder and upload it from Customize → Plugins.

Is Spec Analyzer safe to install?

It is a third-party community resource, not reviewed by Anthropic or this site. Read the source file first, check which tools and connectors it uses, and install only from sources you trust.

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Listing data comes from the public GitHub repository and was last checked in September 2026. Excerpts are © their authors and shared under MIT. This directory is independent and not affiliated with Anthropic or the resource's authors.