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Generate and use standalone schema evaluators (validation and annotation collection without full type generation), and understand the schema evaluation program that every generated type validates…
Install Corvus Standalone Evaluator
$ npx skills add corvus-dotnet/Corvus.JsonSchema --skill corvus-standalone-evaluator -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install corvus-dotnet/Corvus.JsonSchema corvus-standalone-evaluator --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-standalone-evaluator .claude/skills/corvus-standalone-evaluator && 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-standalone-evaluator" agent skill from https://github.com/corvus-dotnet/Corvus.JsonSchema/tree/main/.github/skills/corvus-standalone-evaluator into .claude/skills/corvus-standalone-evaluator/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "corvus-standalone-evaluator", 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-standalone-evaluatorType 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-standalone-evaluator -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install corvus-dotnet/Corvus.JsonSchema corvus-standalone-evaluator --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-standalone-evaluator .agents/skills/corvus-standalone-evaluator && 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-standalone-evaluator" agent skill from https://github.com/corvus-dotnet/Corvus.JsonSchema/tree/main/.github/skills/corvus-standalone-evaluator into .agents/skills/corvus-standalone-evaluator/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "corvus-standalone-evaluator", 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-standalone-evaluator -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install corvus-dotnet/Corvus.JsonSchema corvus-standalone-evaluator --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-standalone-evaluator .cursor/skills/corvus-standalone-evaluator && 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-standalone-evaluator" agent skill from https://github.com/corvus-dotnet/Corvus.JsonSchema/tree/main/.github/skills/corvus-standalone-evaluator into .cursor/skills/corvus-standalone-evaluator/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "corvus-standalone-evaluator", 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-standalone-evaluator--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-standalone-evaluator -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install corvus-dotnet/Corvus.JsonSchema corvus-standalone-evaluator --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-standalone-evaluator .gemini/skills/corvus-standalone-evaluator && 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-standalone-evaluator" agent skill from https://github.com/corvus-dotnet/Corvus.JsonSchema/tree/main/.github/skills/corvus-standalone-evaluator into .gemini/skills/corvus-standalone-evaluator/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "corvus-standalone-evaluator", 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-standalone-evaluatorInstalls 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-standalone-evaluator -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-standalone-evaluator .github/skills/corvus-standalone-evaluator && 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-standalone-evaluator" agent skill from https://github.com/corvus-dotnet/Corvus.JsonSchema/tree/main/.github/skills/corvus-standalone-evaluator into .github/skills/corvus-standalone-evaluator/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "corvus-standalone-evaluator", 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-standalone-evaluator -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-standalone-evaluator --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-standalone-evaluator .opencode/skills/corvus-standalone-evaluator && 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-standalone-evaluator" agent skill from https://github.com/corvus-dotnet/Corvus.JsonSchema/tree/main/.github/skills/corvus-standalone-evaluator into .opencode/skills/corvus-standalone-evaluator/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "corvus-standalone-evaluator", 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-standalone-evaluator- GitHub stars
- 199
- Token cost
- ~988 tokens
- SKILL.md length
- 248 words
- Files
- 1
- Skills in repo
- 28
- Repo updated
- First seen
- Licence
- Apache-2.0
At a glance
Generate and use standalone schema evaluators (validation and annotation collection without full type generation), and understand the schema evaluation program that every generated type validates…
- : generating evaluator-only code
- SKILL.md covers Overview, Generating an evaluator, Using it and Emitted shape, plus 2 more sections
- Calls dotnet
- Collecting annotations from schema validation
What it does
Corvus Standalone Evaluator is an agent skill from corvus-dotnet/Corvus.JsonSchema. Generate and use standalone schema evaluators (validation and annotation collection without full type generation), and understand the schema evaluation program that every generated type validates through: what RuntimeProgramGenerator emits, entry points, document keys, consumer package requirements, and the annotation pipeline. USE FOR: generating evaluator-only code, collecting annotations from schema validation, understanding how generated validation reaches the runtime evaluator, debugging validation behavior…
Its SKILL.md is about 990 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 Forms and validation, Project scaffolding and Debugging. The repository describes itself as: Support for Json Schema validation and entity generation. The licence is Apache-2.0.
When your agent uses it
- : generating evaluator-only code
- Collecting annotations from schema validation
- Understanding how generated validation reaches the runtime evaluator
- Debugging validation behavior of generated types
Example prompts
- “/corvus-standalone-evaluator”
What it can do on your machine
Read from SKILL.md and the folder at commit 973097f. 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
No URLs in SKILL.md.
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 Standalone Evaluator loads about 988 tokens when it runs. Until then it costs about 184 tokens; SKILL.md has 248 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 973097f, republished under its Apache-2.0 licence (© corvus-dotnet). 248 words, ~988 tokens.
Download SKILL.mdSave it as
.claude/skills/corvus-standalone-evaluator/SKILL.md (or your agent's skills folder).- name
- corvus-standalone-evaluator
- description
- Generate and use standalone schema evaluators (validation and annotation collection without full type generation), and understand the schema evaluation program that every generated type validates through: what RuntimeProgramGenerator emits, entry points, document keys, consumer package requirements, and the annotation pipeline. USE FOR: generating evaluator-only code, collecting annotations from schema validation, understanding how generated validation reaches the runtime evaluator, debugging validation behavior of generated types. DO NOT USE FOR: full type generation (use corvus-codegen), keyword semantics (use corvus-keywords-and-validation), the evaluator engine itself (docs/RuntimeEvaluator.md).
Standalone Schema Evaluator and the Evaluation Program
Overview
Generated types and standalone evaluators no longer contain validation code. The generator emits one
CorvusJsonSchemaProgram class per compilation with one entry point per generated type and evaluator
root. Both the CLI and the Roslyn source generator pre-compile it (a program image plus [GeneratedRegex]
methods, loaded by Corvus.Text.Json.RuntimeEvaluator on first use); the source generator links the
compiler in as source, built over System.Text.Json under the STJ define. Every EvaluateSchema() /
Evaluate() call runs against that graph.
Generating an evaluator
[JsonSchemaTypeGenerator("schema.json", EmitEvaluator = true)]
public partial struct MySchema;corvusjson jsonschema schema.json --codeGenerationMode SchemaEvaluationOnly --outputPath ./Evaluator
corvusjson jsonschema schema.json --codeGenerationMode Both --outputPath ./OutputThe emitted MySchemaEvaluator exposes Evaluate<TElement>(in instance, collector) and
Evaluate(IJsonDocument, int, collector). Consumers must reference Corvus.Text.Json.RuntimeEvaluator
as well as Corvus.Text.Json.
Using it
using JsonSchemaResultsCollector collector = JsonSchemaResultsCollector.Create(JsonSchemaResultsLevel.Verbose);
bool valid = MySchemaEvaluator.Evaluate(in element, collector);
foreach (var annotation in JsonSchemaAnnotationProducer.EnumerateAnnotations(collector)) { ... }Flag mode (no collector) fails fast and allocates nothing; Basic/Detailed record failures; Verbose records every keyword and the annotations.
Emitted shape
RuntimeProgramGenerator.Generate— the program: documents (file documents keyed undercorvus-schema:///<relative path>, absolute$ids verbatim),TryGetDocumentresolver,Create()compiling the root withCompileFromUriandForEntryPoint(...)per entry, dialect andAssertFormatoptions.RuntimeProgramGenerator.GenerateStandaloneEvaluator— the evaluator shim over one entry.CodeGeneratorExtensions.JsonSchema.csAppendRuntimeProgramEvaluateMethod— the per-type shim:private static readonly JsonSchemaEvaluator Evaluator = CorvusJsonSchemaProgram.Entry(n);.CSharpLanguageProvider.GetProgramEntryassigns entry indices;ISchemaProgramLanguageProviderreceives the documents fromJsonSchemaTypeBuilder.GetSchemaDocuments().
Debugging
- Dump the compiled graph for a schema with the benchmark harness:
dotnet run -c Release --project benchmarks/Corvus.Text.Json.RuntimeEvaluator.Benchmarks -- dump <schema.json>. SchemaLocation/SchemaDocumentconstants on each type still identify its subschema; the entry point string in the program is<document key>#<SchemaLocation>.- The same engine runs in
tests/Corvus.Text.Json.RuntimeEvaluator.Tests; a failing generated-type test usually reproduces there withJsonSchemaEvaluator.Compile(schema, "#<pointer>").
Cross-References
docs/StandaloneEvaluatorInternals.md,docs/SchemaEvaluator.md,docs/AnnotationSystem.mddocs/RuntimeEvaluator.md— engine design and optimisations
© 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-standalone-evaluator of corvus-dotnet/Corvus.JsonSchema.
Open the folder on GitHubat commit 973097f
Compare with similar skills
Corvus Standalone Evaluator 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 Standalone Evaluator this skillcorvus-dotnet/Corvus.JsonSchema | 199 | — | ~988 | Automated safety check: Pass | Apache-2.0 | |
| Plugin BuilderAIDotNet/NextCoWork | 639 | — | ~2.4k | Automated safety check: Pass | Apache-2.0 | |
| Fetch And Send Datadotnet/skills | 5.6k | 1 repos | ~2.5k | Automated safety check: Pass | MIT | |
| Plan Loopgaasher/Agent-Loop-Skills | 174 | — | ~2.6k | Automated safety check: Pass | MIT | |
| Frappe Impl ClientscriptsImpertio-Studio/Frappe_Claude_Skill_Package | 188 | — | ~2.4k | Automated safety check: Pass | MIT | |
| Greenfield Project Scaffoldingasgeirtj/system_prompts_leaks | 69k | — | ~1.6k | Automated safety check: Pass | CC0-1.0 |
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Related
Categories
Questions about Corvus Standalone Evaluator
What does Corvus Standalone Evaluator do?
Generate and use standalone schema evaluators (validation and annotation collection without full type generation), and understand the schema evaluation program that every generated type validates…. JsonSchema. Generate and use standalone schema evaluators (validation and annotation collection without full type generation), and understand the schema evaluation program that every generated type validates through: what RuntimeProgramGenerator emits, entry points, document keys, consumer package requirements, and the annotation pipeline.
When should I use Corvus Standalone Evaluator?
Corvus Standalone Evaluator fits situations like: : generating evaluator-only code; collecting annotations from schema validation; understanding how generated validation reaches the runtime evaluator; debugging validation behavior of generated types.
How do I install Corvus Standalone Evaluator in Claude Code?
Run `npx skills add corvus-dotnet/Corvus.JsonSchema --skill corvus-standalone-evaluator -a claude-code`. Or copy the skill folder (.github/skills/corvus-standalone-evaluator in corvus-dotnet/Corvus.JsonSchema) into .claude/skills/corvus-standalone-evaluator in your project. Claude Code loads it when a task matches its description.
How do I install Corvus Standalone Evaluator in Codex?
Run `npx skills add corvus-dotnet/Corvus.JsonSchema --skill corvus-standalone-evaluator -a codex`. Or copy the skill folder (.github/skills/corvus-standalone-evaluator in corvus-dotnet/Corvus.JsonSchema) into .agents/skills/corvus-standalone-evaluator in your project. Codex loads it when a task matches its description.
Can I use Corvus Standalone Evaluator 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-standalone-evaluator -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-standalone-evaluator, .gemini/skills/corvus-standalone-evaluator, .github/skills/corvus-standalone-evaluator and .opencode/skills/corvus-standalone-evaluator in your project.
What does Corvus Standalone Evaluator need to run?
Going by SKILL.md and its folder, Corvus Standalone Evaluator needs the command-line tools its instructions call (dotnet).
Does Corvus Standalone Evaluator access the network?
SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.
Is Corvus Standalone Evaluator 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 Standalone Evaluator use?
Corvus Standalone Evaluator 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 Standalone Evaluator use?
About 988 tokens (SKILL.md is roughly 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 Standalone Evaluator?
Skills that share tags, products or a category with Corvus Standalone Evaluator: Plugin Builder (AIDotNet/NextCoWork, 639 stars), Fetch And Send Data (dotnet/skills, 5.6k stars), Plan Loop (gaasher/Agent-Loop-Skills, 174 stars) and Frappe Impl Clientscripts (Impertio-Studio/Frappe_Claude_Skill_Package, 188 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Corvus Standalone Evaluator?
corvus-dotnet (a GitHub organization) maintains it in corvus-dotnet/Corvus.JsonSchema, which has 199 GitHub stars. The repository holds 28 skills in this directory. The repository was last updated on October 9, 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.