Design Import
yonatangross/orchestkit
Scaffolds React components from a Claude Design handoff bundle and stops at files on disk: no stories, no tests, no pull request.
Work with JSONata, JMESPath, JsonLogic, and JSONPath query and transformation languages.
Install Corvus Query Languages
$ npx skills add corvus-dotnet/Corvus.JsonSchema --skill corvus-query-languages -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install corvus-dotnet/Corvus.JsonSchema corvus-query-languages --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/corvus-dotnet/Corvus.JsonSchema.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.github/skills/corvus-query-languages .claude/skills/corvus-query-languages && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "corvus-query-languages" agent skill from https://github.com/corvus-dotnet/Corvus.JsonSchema/tree/main/.github/skills/corvus-query-languages into .claude/skills/corvus-query-languages/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "corvus-query-languages", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/corvus-dotnet/Corvus.JsonSchema/tree/main/.github/skills/corvus-query-languagesType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add corvus-dotnet/Corvus.JsonSchema --skill corvus-query-languages -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install corvus-dotnet/Corvus.JsonSchema corvus-query-languages --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/corvus-dotnet/Corvus.JsonSchema.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.github/skills/corvus-query-languages .agents/skills/corvus-query-languages && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "corvus-query-languages" agent skill from https://github.com/corvus-dotnet/Corvus.JsonSchema/tree/main/.github/skills/corvus-query-languages into .agents/skills/corvus-query-languages/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "corvus-query-languages", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add corvus-dotnet/Corvus.JsonSchema --skill corvus-query-languages -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install corvus-dotnet/Corvus.JsonSchema corvus-query-languages --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/corvus-dotnet/Corvus.JsonSchema.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.github/skills/corvus-query-languages .cursor/skills/corvus-query-languages && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "corvus-query-languages" agent skill from https://github.com/corvus-dotnet/Corvus.JsonSchema/tree/main/.github/skills/corvus-query-languages into .cursor/skills/corvus-query-languages/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "corvus-query-languages", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/corvus-dotnet/Corvus.JsonSchema.git --path .github/skills/corvus-query-languages--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add corvus-dotnet/Corvus.JsonSchema --skill corvus-query-languages -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install corvus-dotnet/Corvus.JsonSchema corvus-query-languages --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/corvus-dotnet/Corvus.JsonSchema.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.github/skills/corvus-query-languages .gemini/skills/corvus-query-languages && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "corvus-query-languages" agent skill from https://github.com/corvus-dotnet/Corvus.JsonSchema/tree/main/.github/skills/corvus-query-languages into .gemini/skills/corvus-query-languages/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "corvus-query-languages", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install corvus-dotnet/Corvus.JsonSchema corvus-query-languagesInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add corvus-dotnet/Corvus.JsonSchema --skill corvus-query-languages -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/corvus-dotnet/Corvus.JsonSchema.git skills-src && mkdir -p .github/skills && cp -r skills-src/.github/skills/corvus-query-languages .github/skills/corvus-query-languages && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "corvus-query-languages" agent skill from https://github.com/corvus-dotnet/Corvus.JsonSchema/tree/main/.github/skills/corvus-query-languages into .github/skills/corvus-query-languages/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "corvus-query-languages", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add corvus-dotnet/Corvus.JsonSchema --skill corvus-query-languages -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install corvus-dotnet/Corvus.JsonSchema corvus-query-languages --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/corvus-dotnet/Corvus.JsonSchema.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.github/skills/corvus-query-languages .opencode/skills/corvus-query-languages && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "corvus-query-languages" agent skill from https://github.com/corvus-dotnet/Corvus.JsonSchema/tree/main/.github/skills/corvus-query-languages into .opencode/skills/corvus-query-languages/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "corvus-query-languages", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
corvus-query-languages- GitHub stars
- 199
- Token cost
- ~2.1k tokens
- SKILL.md length
- 359 words
- Files
- 1
- Skills in repo
- 26
- Repo updated
- First seen
- Licence
- Apache-2.0
At a glance
Work with JSONata, JMESPath, JsonLogic, and JSONPath query and transformation languages.
- : evaluating queries and transforms
- SKILL.md covers Architecture, JSONata, JMESPath and JsonLogic, plus 4 more sections
- Calls dotnet
- Generating optimized evaluators
What it does
Corvus Query Languages is an agent skill from corvus-dotnet/Corvus.JsonSchema. Work with JSONata, JMESPath, JsonLogic, and JSONPath query and transformation languages. Each has runtime (interpreted) and code-generated evaluation modes plus Roslyn source generators. Covers the JSONata evaluator API, JMESPath Search(), JsonLogic rule engine, JSONPath Query/QueryNodes with custom function extensions, conformance test suites, code generation for all four, and performance characteristics. USE FOR: evaluating queries and transforms, generating optimized evaluators, running conformance tests…
Its SKILL.md is about 2.1k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.
It sits in Development, covering Project scaffolding, Test generation and Forms and validation. The repository describes itself as: Support for Json Schema validation and entity generation. The licence is Apache-2.0.
When your agent uses it
- : evaluating queries and transforms
- Generating optimized evaluators
- Running conformance tests
- Understanding the dual (runtime + codegen) architecture
Example prompts
- “/corvus-query-languages”
What it can do on your machine
Read from SKILL.md and the folder at commit b9e3040. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
Shell commands in SKILL.md call:
dotnet
From the folder's file list and the shell code blocks in SKILL.md.
Network
Links to these hosts (documentation or services it may open):
rfc-editor.org
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
Corvus Query Languages loads about 2.1k tokens when it runs. Until then it costs about 175 tokens; SKILL.md has 359 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
Safety
Auto-check passed
The automated check found no risky patterns in SKILL.md.
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.
SKILL.md
The full file from corvus-dotnet/Corvus.JsonSchema at commit b9e3040, republished under its Apache-2.0 licence (© corvus-dotnet). 359 words, ~2,103 tokens.
Download SKILL.mdSave it as
.claude/skills/corvus-query-languages/SKILL.md (or your agent's skills folder).- name
- corvus-query-languages
- description
- Work with JSONata, JMESPath, JsonLogic, and JSONPath query and transformation languages. Each has runtime (interpreted) and code-generated evaluation modes plus Roslyn source generators. Covers the JSONata evaluator API, JMESPath Search(), JsonLogic rule engine, JSONPath Query/QueryNodes with custom function extensions, conformance test suites, code generation for all four, and performance characteristics. USE FOR: evaluating queries and transforms, generating optimized evaluators, running conformance tests, understanding the dual (runtime + codegen) architecture. DO NOT USE FOR: JSON Schema validation (use corvus-keywords-and-validation or corvus-standalone-evaluator).
Query Languages: JSONata, JMESPath, JsonLogic, JSONPath
Architecture
Each language follows the same three-package pattern:
| Package tier | JSONata | JMESPath | JsonLogic | JSONPath |
|---|---|---|---|---|
| Runtime (interpreted) | Corvus.Text.Json.Jsonata | Corvus.Text.Json.JMESPath | Corvus.Text.Json.JsonLogic | Corvus.Text.Json.JsonPath |
| Code generation library | Corvus.Text.Json.Jsonata.CodeGeneration | Corvus.Text.Json.JMESPath.CodeGeneration | Corvus.Text.Json.JsonLogic.CodeGeneration | Corvus.Text.Json.JsonPath.CodeGeneration |
| Source generator | Corvus.Text.Json.Jsonata.SourceGenerator | Corvus.Text.Json.JMESPath.SourceGenerator | Corvus.Text.Json.JsonLogic.SourceGenerator | Corvus.Text.Json.JsonPath.SourceGenerator |
JSONata
Conformance: 100% (1,665 tests) Performance: Up to 8× faster than Jsonata.Net.Native (runtime), up to 12× (code-generated)
Runtime Evaluation
using var doc = ParsedJsonDocument<JsonElement>.Parse(data);
JsonElement result = JsonataEvaluator.Default.Evaluate(expression, doc.RootElement);Code-Generated Evaluation
// Source generator takes a .jsonata FILE path, not an inline expression
[JsonataExpression("expressions/total-price.jsonata")]
internal static partial class TotalPrice;
// Usage — code-gen produces a static Evaluate(in JsonElement, JsonWorkspace) method:
using JsonWorkspace workspace = JsonWorkspace.Create();
JsonElement result = TotalPrice.Evaluate(doc.RootElement, workspace);Key Notes
- User-defined functions may shadow built-ins; compilation preserves runtime fallback
- Individual test cases have 10-second timeout for runaway recursion
- Conformance tests:
dotnet test --project tests\Corvus.Text.Json.Jsonata.Tests --filter "TestCategory!=failing&TestCategory!=outerloop" - Code-gen tests tagged:
codegen-conformanceandcodegen-edge
JMESPath
Conformance: 100% (892 tests) Performance: Up to 150× faster than JmesPath.Net
Runtime Evaluation
using var doc = ParsedJsonDocument<JsonElement>.Parse(data);
JsonElement result = JMESPathEvaluator.Default.Search(expression, doc.RootElement);Code-Generated Evaluation
// Source generator takes a .jmespath FILE path, not an inline expression
[JMESPathExpression("expressions/wa-locations.jmespath")]
internal static partial class WashingtonLocations;
// Usage — code-gen produces a static Evaluate(in JsonElement, JsonWorkspace) method:
using JsonWorkspace workspace = JsonWorkspace.Create();
JsonElement result = WashingtonLocations.Evaluate(doc.RootElement, workspace);JsonLogic
Complete rule engine with all standard operations.
Runtime Evaluation
using var ruleDoc = ParsedJsonDocument<JsonElement>.Parse(ruleJson);
JsonLogicRule rule = new(ruleDoc.RootElement);
using var dataDoc = ParsedJsonDocument<JsonElement>.Parse(dataJson);
JsonElement result = JsonLogicEvaluator.Default.Evaluate(rule, dataDoc.RootElement);Code-Generated Evaluation
// Source generator takes a .json FILE path containing the rule, not an inline expression
[JsonLogicRule("rules/conditional.json")]
internal static partial class ConditionalRule;
// Usage — code-gen produces a static Evaluate(in JsonElement, JsonWorkspace) method:
using JsonWorkspace workspace = JsonWorkspace.Create();
JsonElement result = ConditionalRule.Evaluate(doc.RootElement, workspace);Thread Safety Warning
JsonLogicEvaluator (including the Default singleton) has mutable last-rule cache fields (_lastCompiled, _lastRuleIdentity) that are not synchronized. The ConcurrentDictionary cache is thread-safe, but the fast-path identity check is not. Concurrent calls on the same instance may produce correct results but with degraded cache performance (benign races). If strict single-evaluation-at-a-time fast-path caching matters, use separate instances or external synchronization.
JSONPath
Conformance: 100% (723 tests) — full RFC 9535 compliance Performance: Up to 16× fewer allocations than JsonEverything; faster on all benchmark scenarios (both RT and CG)
Runtime Evaluation
// Returns a JSON array of matched nodes within the provided workspace
using JsonWorkspace workspace = JsonWorkspace.Create();
JsonElement result = JsonPathEvaluator.Default.Query("$.store.book[*].author", doc.RootElement, workspace);
// Zero-allocation — returns a disposable result with direct node access
using JsonPathResult result = JsonPathEvaluator.Default.QueryNodes("$.store.book[?@.price<10]", doc.RootElement);
foreach (JsonElement node in result.Nodes)
{
Console.WriteLine(node);
}Code-Generated Evaluation
// Source generator takes a .jsonpath FILE path, not an inline expression
[JsonPathExpression("expressions/book-authors.jsonpath")]
internal static partial class BookAuthors;
// Usage — code-gen produces a static Query(in JsonElement, JsonWorkspace) method:
using JsonWorkspace workspace = JsonWorkspace.Create();
JsonElement result = BookAuthors.Query(doc.RootElement, workspace);Show full SKILL.md (147 more words)Show less
Custom Function Extensions
JSONPath supports custom function extensions for both runtime and code generation:
// Register a custom function at runtime
JsonPathEvaluator evaluator = JsonPathEvaluator.Default
.WithFunction(JsonPathFunction.Value("double", args => JsonPathFunctionResult.FromValue(args[0].GetDouble() * 2)));Key Notes
- JSONPath focuses on node selection (returns matched nodes); for data reshaping use JMESPath or JSONata
- Custom functions use
JsonPathFunction.Value,Logical,NodesValue,NodesLogical, orCreatefactories JsonPathFunctionResult.FromValueoverloads accept int, double, string, and bool
Running Tests
# JSONata conformance
dotnet test --project tests\Corvus.Text.Json.Jsonata.Tests --filter "TestCategory!=failing&TestCategory!=outerloop"
# JSONata code-gen
dotnet test --project tests\Corvus.Text.Json.Jsonata.CodeGeneration.Tests --filter "TestCategory!=failing&TestCategory!=outerloop"
# JMESPath conformance
dotnet test --project tests\Corvus.Text.Json.JMESPath.Tests --filter "TestCategory!=failing&TestCategory!=outerloop"
# JsonLogic conformance
dotnet test --project tests\Corvus.Text.Json.JsonLogic.Tests --filter "TestCategory!=failing&TestCategory!=outerloop"
# JSONPath conformance
dotnet test --project tests\Corvus.Text.Json.JsonPath.Tests --filter "TestCategory!=failing&TestCategory!=outerloop"
# JSONPath code-gen
dotnet test --project tests\Corvus.Text.Json.JsonPath.CodeGeneration.Tests --filter "TestCategory!=failing&TestCategory!=outerloop"Common Pitfalls
- JsonLogic thread safety: The
Defaultsingleton's fast-path cache fields (_lastCompiled,_lastRuleIdentity) are not atomic. Concurrent use is functionally safe (falls back toConcurrentDictionary) but the fast-path may thrash. Use separate instances if this matters. - JSONata timeout: Complex expressions may hit the 10-second test timeout.
- Code-gen vs runtime: Code-generated evaluators are pre-compiled and faster, but less flexible for dynamic expressions.
- JSONPath ordering: Evaluation must preserve document order and selector declaration order; descendant queries may yield duplicates in order.
Cross-References
- For benchmarking query languages, see
corvus-benchmarks - For building/testing, see
corvus-build-and-test - Full guides:
docs/Jsonata.md,docs/JMESPath.md,docs/JsonLogic.md,docs/JsonPath.md
© corvus-dotnet, Apache-2.0. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
Just SKILL.md in .github/skills/corvus-query-languages of corvus-dotnet/Corvus.JsonSchema.
Open the folder on GitHubat commit b9e3040
Compare with similar skills
Corvus Query Languages next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Corvus Query Languages this skillcorvus-dotnet/Corvus.JsonSchema | 199 | — | ~2.1k | Automated safety check: Pass | Apache-2.0 | |
| Design Importyonatangross/orchestkit | 289 | — | ~2.9k | Automated safety check: Notes | MIT | |
| Core PR Helpercalimero-network/core | 171 | — | ~614 | Automated safety check: Pass | Custom licence | |
| Veomni Patchgen ModelByteDance-Seed/VeOmni | 2.2k | — | ~9.6k | Automated safety check: Pass | Apache-2.0 | |
| Exp Test Maintainabilitydotnet/skills | 5.6k | 1 repos | ~2.5k | Automated safety check: Pass | MIT | |
| Antigravityyuting0624/antigravity-for-claude-code | 376 | — | ~9.1k | Automated safety check: Pass | MIT |
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Related
Categories
Questions about Corvus Query Languages
What does Corvus Query Languages do?
Work with JSONata, JMESPath, JsonLogic, and JSONPath query and transformation languages. JsonSchema. Work with JSONata, JMESPath, JsonLogic, and JSONPath query and transformation languages.
When should I use Corvus Query Languages?
Corvus Query Languages fits situations like: : evaluating queries and transforms; generating optimized evaluators; running conformance tests; understanding the dual (runtime + codegen) architecture.
How do I install Corvus Query Languages in Claude Code?
Run `npx skills add corvus-dotnet/Corvus.JsonSchema --skill corvus-query-languages -a claude-code`. Or copy the skill folder (.github/skills/corvus-query-languages in corvus-dotnet/Corvus.JsonSchema) into .claude/skills/corvus-query-languages in your project. Claude Code loads it when a task matches its description.
How do I install Corvus Query Languages in Codex?
Run `npx skills add corvus-dotnet/Corvus.JsonSchema --skill corvus-query-languages -a codex`. Or copy the skill folder (.github/skills/corvus-query-languages in corvus-dotnet/Corvus.JsonSchema) into .agents/skills/corvus-query-languages in your project. Codex loads it when a task matches its description.
Can I use Corvus Query Languages in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add corvus-dotnet/Corvus.JsonSchema --skill corvus-query-languages -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/corvus-query-languages, .gemini/skills/corvus-query-languages, .github/skills/corvus-query-languages and .opencode/skills/corvus-query-languages in your project.
What does Corvus Query Languages need to run?
Going by SKILL.md and its folder, Corvus Query Languages needs the command-line tools its instructions call (dotnet).
Does Corvus Query Languages access the network?
SKILL.md names 1 domain. As links in the text: rfc-editor.org. This is read from the text; nothing was executed.
Is Corvus Query Languages safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.
What licence does Corvus Query Languages use?
Corvus Query Languages is published under the Apache-2.0 licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Corvus Query Languages use?
About 2.1k tokens (SKILL.md is roughly 8.4k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.
What are the alternatives to Corvus Query Languages?
Skills that share tags, products or a category with Corvus Query Languages: Design Import (yonatangross/orchestkit, 289 stars), Core PR Helper (calimero-network/core, 171 stars), Veomni Patchgen Model (ByteDance-Seed/VeOmni, 2.2k stars) and Exp Test Maintainability (dotnet/skills, 5.6k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Corvus Query Languages?
corvus-dotnet (a GitHub organization) maintains it in corvus-dotnet/Corvus.JsonSchema, which has 199 GitHub stars. The repository holds 26 skills in this directory. The repository was last updated on October 8, 2026.
Source: corvus-dotnet/Corvus.JsonSchema on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.