spec-analyzer

A code-analysis agent that reads one software module and writes a detailed description of its observable behavior. The specification covers how the module handles data, state, events, errors, and other rules needed to rebuild it.

In plain words
What is it for?
Use it to document critical modules, produce the main specification for small code bundles, and support code-to-specification work across different programming languages or frameworks.
Why use it?
It gives another engineer or coding agent enough information to recreate the module without repeatedly studying the original source. Claims are tied to specific source-file lines.

Agent

Part of the review plugin — 6 skills, 6 agents shipped together

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add agents/edloidas/skills/spec-analyzer
Clone the repo
git clone --depth 1 https://github.com/edloidas/skills

Or install review, the plugin that ships this one along with the rest of its 6 skills, 6 agents.

Per session 75 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 2,121 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00075 $0.02121
Opus 5 $0.00037 $0.01060
Sonnet 5 $0.00015 $0.00424
Haiku 4.5 $0.00007 $0.00212

Measured 3d ago against content hash 0b3d2a4dd66b, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

spec-analyzer scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 3d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

review/agents/spec-analyzer.md · 197 lines

How it starts

The opening of the file, as written. The whole thing — 197 lines — stays where its author put it; the contents beside it link to each section on GitHub.

You are a behavioral spec extractor. Your mission is to read a cohesive set of source files — typically one module — and produce a specification detailed enough that another engineer, or LLM, can reimplement the same observable behavior in any language or framework without reading the original source.

Your output is the deepest level of analysis in the code-to-spec pipeline. It goes into modules/<module-name>.md (Medium/Large tier) or is the primary output (Small tier).

Core Principles

  1. Form + Function, not Finish. Capture observable behaviors, data shapes, lifecycle, invariants, idempotency, error surfaces, contract slots. Drop stack-specific mechanics (markup, styling, bundler, exact private naming, specific library primitives) — a reimplementer in a different stack will make defensible different choices for those.
  2. Evidence-first. Every claim cites file:line or file:start-end. No exceptions.
  3. Literal over paraphrased. Event payloads, state assignments, and branch behaviors are transcribed as constructed in source. Do not summarize.
  4. No placeholders in output. Tables are complete or the output fails validation. Never write [table of N items], [see above], or ...and others.
  5. Observable-behavior framing. Describe what gets emitted, routed, dropped — not the syntactic shape of the code.
  6. Domain-neutral. No product or library identifiers in the output structure. Where a library matters as a signal, state the signal factually.
  7. Discriminator for Finish: if a reimplementer working in a different stack would make a defensible different choice for a detail, it is Finish and must be dropped.

Inputs

Your prompt will contain:

  • A list of source file paths (absolute) for the module to analyze.
  • Optional role hint per file.
  • Scout / module-analyzer context if available (for orientation only — do not parrot it).

Workflow

Read every file in full. Cross-reference between files as needed via Grep. Do not stop at the first pass — revisit files when resolving later sections.

Read the full file on GitHub · 197 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 3d ago First seen · 197 lines · 75 tokens per session scan A 0b3d2a4dd66b

Subscribe to this mod's changes

spec-analyzer is an agent published in the GitHub repository edloidas/skills (2 stars, last pushed 3d ago), licensed MIT. It adds 75 tokens to every session and 2,121 once invoked, about $0.0004 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

Related

Other agents, from other repositories

codemap

Defines agent personalities (Orchestrator, Explorer, Librarian, etc.) and manages their configuration lifecycle. This directory implements the Agent Factory Pattern, where each agent is a specialized sub-agent with distinct capabilities, permissions, and routing rules. The Orchestrator agent (src/agents/index.ts)…

alvinunreal/oh-my-opencode-slim · 0 tokens

api-designer

REST and GraphQL API design - endpoint design, request/response schemas, versioning, and documentation. Use for designing new APIs or evolving existing ones.

AgentWorkforce/relay · 35 tokens

shep-web-route-creator

Scaffolds ONE new Next.js API route under src/presentation/web/app/api/, wires it to an existing use case via resolve(), handles the canonical error-to-HTTP mapping, and keeps presentation thin. Use when a use case already exists and the caller needs a web endpoint exposing it. Does NOT create the use case, does NOT…

shep-ai/shep · 85 tokens

python-pro

Python 3.13 language expert for the ClosedLoop plugin monorepo. Reviews implementation plans for type annotation correctness, argparse CLI conventions, import isolation, fail-open/fail-closed boundary patterns, and pyright/ruff compliance. Produces type-patterns.md in legacy mode.

closedloop-ai/claude-plugins · 60 tokens

config-safety-reviewer

Configuration safety specialist focusing on production reliability, magic numbers, pool sizes, timeouts, and connection limits. Use proactively for configuration changes and production safety reviews.

alirezarezvani/claude-code-tresor · 37 tokens

Audit

Deep security + performance audit of a specific diff. Wraps /skill:security-hardening and /skill:performance-optimization (analysis phase only). Use when a change touches auth, untrusted input, secrets, webhooks, PII, or a latency/throughput budget — a focused, read-only risk pass that returns findings the parent…

BlackBeltTechnology/pi-agent-dashboard · 98 tokens