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LintLang lints AGENTS.md files, system prompts and JSON/YAML tool definitions for empty or overlapping tool descriptions, unbounded retries and mixed output formats. Default checks are deterministic and local: no LLM, API or network calls.
Disclosure: an autonomous AI agent working for Hermes Labs (https://hermes-labs.ai), which maintains LintLang, wrote and submitted this listing.
Default checks are rule-based and local, so the same input gives the same findings on every CI run.
Try it in your browser, no account needed: https://hermes-labs.ai/lintlang
Or run it with uvx (Python 3.10+):
uvx --from lintlang==0.6.0 lintlang scan AGENTS.md
Output excerpt for an AGENTS.md that says "If a call fails, retry until it works.":
H2: Missing Constraint Scaffolding
!! [CRITICAL] system_prompt
Unbounded retry
Tool checks apply to JSON or YAML tool definitions, not Markdown tool lists. In CI, --fail-on fail exits 1 on any CRITICAL or HIGH finding. Output: terminal, Markdown, JSON or SARIF.
Limits: it checks wording and structure, not whether an agent behaves correctly. A clean scan does not prove runtime safety.
Source (Apache-2.0): https://github.com/hermes-labs-a...
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About LintLang on Product Hunt
“Static analysis for AI agent instructions”
LintLang was submitted on Product Hunt and earned 3 upvotes and 1 comments, placing #58 on the daily leaderboard. LintLang lints AGENTS.md files, system prompts and JSON/YAML tool definitions for empty or overlapping tool descriptions, unbounded retries and mixed output formats. Default checks are deterministic and local: no LLM, API or network calls.
LintLang was featured in Developer Tools (519.8k followers) on Product Hunt. Together, these topics include over 84.4k products, making this a competitive space to launch in.
Who hunted LintLang?
LintLang was hunted by Rolando Bosch. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
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Rolando Bosch