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ArchSpec is a tool for Ruby and Rails teams that turns architecture conventions into rules checked against code, including changes written with AI assistance. Instead of asking an agent to remember boundaries, you can make those boundaries executable and run the checks repeatedly. The name is also used by unrelated tools, so this article refers specifically to the Ruby and Rails product at archspecrb.dev.
What ArchSpec checks—and what it does not
ArchSpec lets a team define architecture and code-convention rules in Ruby configuration, then uses static analysis to check source code against them. Its product page describes the approach as “No AI involved, just static analysis.” That is the vendor’s description of its analysis method, not an independent accuracy claim. The practical distinction is that the rules can be applied to code regardless of whether a person or an AI agent wrote it.
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Teams can express component dependency boundaries, require or forbid methods, forbid calls, restrict constant references, and check for dependency cycles. For example, a team could prevent models from depending on controllers or prohibit services from calling rendering and redirect methods. These are examples, not universal Rails architecture requirements; the rules should reflect the boundaries the team actually wants to enforce. See the configuration reference for supported rule forms.
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1Fix the driver behind crashes, sound loss and screen glitches2Repair Windows errors before they cause bigger problems3Scan for outdated or missing drivers - takes under a minuteArchSpec is not a substitute for deciding what the architecture should be. It checks the rules you define, so rules that are vague, incomplete, or inappropriate for the codebase can still produce an incomplete or unhelpful guardrail.
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Install it and run the first check
The official getting-started guide specifies Ruby 3.2 or newer. The basic setup is a development dependency, a configuration file, and the CLI check:
-
Add
gem "archspec"to the Gemfile’s development or test group. -
Install dependencies with
bundle install. -
Create the initial configuration by running
bundle exec archspec init.Free tools Windows power users keep installed
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Edit
Archspec.rbto select and assign source files and define the rules your team wants checked. -
Run
bundle exec archspec checkto evaluate the code against those rules.
The guide says a passing check exits with status 0 and a failed check returns a nonzero status. That makes the command suitable for automation that treats violations as a failed step. For exact current setup details, consult ArchSpec’s Getting Started guide.
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Shape rules around your codebase
The configuration can select source files, exclude ignored patterns, and assign files to named components. Those assignments give dependency rules meaningful boundaries: for example, a rule can allow or prohibit dependencies between components, or restrict which components are permitted to depend on a particular component.
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Other controls cover method requirements and prohibitions, forbidden calls, constant references, and dependency cycles. Rule declarations can include reasons. Documented inline suppression comments and todo handling provide a way to represent exceptions rather than silently ignoring them. Use exceptions deliberately: a suppression should explain why a rule does not apply in that location, not become a general escape hatch.
Use findings in review and automation
A violation diagnostic includes the rule ID and message, the offending code span, and a note describing the evidence found. The CLI also supports command help, alternate configuration paths, and JSON output. The combination is useful in two different places: developers can inspect the evidence during review, while scripts can use the exit status to decide whether a check passed. The CLI documentation describes the available command options and output.
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Once a check fits the team’s workflow, it can be run in CI, from a git hook, or after AI-assisted changes. A failed check signals that the configured rules found a violation; it does not by itself determine whether the rule is still appropriate or whether the code needs an exception. Developers still need to review the diagnostic and make that judgment.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Understand the limits of static analysis
ArchSpec’s implementation documentation describes a pipeline that discovers files, parses syntax, resolves semantics, merges facts, assigns components, evaluates rules, applies suppressions and todo handling, and emits diagnostics. The project says checks index code without loading the application, so they do not require a Rails boot or database and have no side effects. Those are vendor-documented behavior claims, not independently verified test results; details are described in How It Works.
Static analysis cannot always resolve Ruby’s dynamic behavior. ArchSpec documents dynamic receivers as unknown rather than guessed, and identifies features such as send, const_get, and method_missing as analysis gaps. Consequently, a clean check means no violation was found under the configured rules and the facts the analyzer could establish; it does not prove that every runtime dependency or architectural concern has been captured. Review the evidence for important rules and decide whether dynamic patterns in your code need additional safeguards.
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What to assess before adopting it
For a Ruby or Rails team, the key question is whether the architecture boundaries worth enforcing can be expressed clearly enough to be checked. Start with a small number of meaningful rules, then see whether the diagnostics give reviewers useful evidence and whether exceptions remain manageable. Consider the intended integration point—local command, git hook, or CI—and how the team will maintain rules as the codebase changes.
If evaluating ArchSpec alongside other architecture-checking approaches, compare supported languages and frameworks, static versus runtime or AI-based analysis, rule coverage, diagnostic evidence, integration options, treatment of dynamic language features, and licensing and hosting terms. The available documentation establishes ArchSpec’s Ruby and Rails workflow and capabilities, but does not provide comparative benchmarks or establish a tested winner.
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