yq
yq is a command-line utility for querying and transforming YAML (and related data) using a jq-like syntax. It can read from files or stdin and output transformed YAML/JSON.
Score Breakdown
⚙ Agent Friendliness
🔒 Security
No TLS/auth involved because it is a local CLI. Main security considerations are safe handling of sensitive YAML content passed via files/stdin (avoid logging secrets) and ensuring the yq package dependencies are kept up to date to mitigate CVEs.
⚡ Reliability
Best When
You already work with YAML in shell scripts/CI and want jq-like transformations without writing a full program.
Avoid When
You require interactive UIs, long-running services, or a hosted API interface.
Use Cases
- • Convert and restructure YAML configuration files
- • Extract specific fields from YAML
- • Apply transformations across multiple YAML documents
- • Generate derived YAML/JSON for deployment/config pipelines
- • Validate or normalize YAML by rewriting it in a consistent structure
Not For
- • Complex API-driven workflows requiring network calls
- • Cases where you need an always-on service with authentication/rate limits
- • Binary or non-text formats (unless wrapped/consolidated into YAML first)
Interface
Authentication
No network authentication; operates locally on provided input (files/stdin).
Pricing
Typically open-source CLI; no usage-based pricing.
Agent Metadata
Known Gotchas
- ⚠ YAML quoting/escaping issues in shell contexts (especially expressions and paths)
- ⚠ Handling of null/missing fields can yield different outputs vs jq-like expectations
- ⚠ Differences between yq variants/major versions (syntax/flags may not be identical)
- ⚠ Large YAML files can be memory-intensive depending on implementation
Alternatives
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Scores are editorial opinions as of 2026-04-04.