Agent Skills Runtime

Agents should execute whenever possible.

Agent Skills turns repeatable agent reasoning into executable skills: reusable, testable, observable, and portable across tools and model providers.

Stop rebuilding agent logic in prompts. Define it once as a skill, bind it to any backend, and run it with full traceability.

Agent Skills Runtime is the reference implementation of ORCA (Open Cognitive Runtime Architecture):

• Skills package reusable cognitive workflows
• Capabilities define backend-agnostic contracts
• Bindings connect contracts to execution backends (PythonCall, OpenAPI, MCP, OpenRPC)
• Runtime executes DAGs with policy/safety, CognitiveState, and traceability

No API key required for local-first runs. Deterministic Python baselines are available for offline development and testing.

---

The problem

Most agent systems still encode critical logic inside prompts and framework glue.

That creates recurring engineering pain:

• Reasoning logic gets trapped in prompt text instead of executable workflows
• Workflows are hard to reuse and harder to test
• Contracts between steps are implicit and brittle
• Observability and auditability are often an afterthought
• Safety and governance controls are inconsistent
• Switching providers or frameworks usually means rewriting too much

---

The ORCA answer

ORCA introduces an execution layer for cognitive workflows:

• Skills are reusable cognitive workflows
• Capabilities are stable, contract-driven interfaces
• Bindings are interchangeable execution backends
• Runtime is a DAG scheduler + policy engine + cognitive state + trace

This keeps reasoning structure explicit and executable, while preserving portability across backends.

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Before / after

Before (logic trapped in prompt text):

prompt = """
Analyze this PR.
Find risks.
Estimate confidence.
Suggest fixes.
Return JSON.
"""

After (logic as a reusable skill graph):

# Conceptual example (illustrative structure)
skill: code.pr.review
steps:
  - parse_diff
  - detect_risks
  - score_confidence
  - generate_review
  - validate_output

Same reasoning pattern. Reusable. Testable. Observable. Bindable to Python, OpenAPI, MCP, or your own APIs.

---

Try it locally in 3 minutes

git clone https://github.com/gfernandf/agent-skills.git
cd agent-skills
make bootstrap
python skills.py doctor
python skills.py run text.language-summary \
  --input '{"text": "ORCA turns agent reasoning into reusable executable skills."}'

What to expect:

• No API key required
• Runs offline with deterministic Python baselines
• First run may take 30-60 seconds

Windows PowerShell setup and run

git clone https://github.com/gfernandf/agent-skills.git
cd agent-skills
pip install -e ".[all,dev]"
git clone https://github.com/gfernandf/agent-skill-registry.git ../agent-skill-registry
python skills.py doctor

$env:OPENAI_API_KEY = ""
'{ "text": "ORCA turns agent reasoning into reusable executable skills." }' | Set-Content input_qs.json -Encoding ascii
python skills.py run text.language-summary --input-file input_qs.json
Remove-Item input_qs.json

---

Why this matters beyond a toy summary

The first command verifies install. The stronger demo is the official skill decision.make.

decision.make shows a full decision workflow under uncertainty with explicit stages and auditable outputs.

From the skill contract in the registry, it includes:

• Multi-step pipeline (option generation, analysis, scoring, justification, validation)
• Structured outputs such as recommendation, tradeoffs, confidence_score, confidence_level, uncertainties, and next_steps
• Risk-aware reasoning through explicit criteria and constraints
• Trace-friendly execution aligned with ORCA observability goals

Conceptual output shape for decision-style workflows:

{
  "recommendation": "Proceed with a controlled pilot",
  "confidence_score": 0.82,
  "confidence_level": "medium",
  "tradeoffs": [
    "Faster learning, higher short-term operational overhead"
  ],
  "uncertainties": [
    "Regulatory timeline may change in Q3"
  ],
  "next_steps": [
    "Run a 6-week pilot in one segment"
  ],
  "trace_id": "..."
}

Note: the JSON above is illustrative. Exact outputs depend on input context, bindings, and policy settings.

---

I want to...

I want to try it

• Start with local CLI: see Try it locally in 3 minutes
• Use deterministic baselines for offline reproducibility
• Explore first workflows in examples and docs

I want to integrate it

Choose one integration surface:

• Embedded SDK (lowest latency, in-process)
• HTTP API (service boundary, non-Python clients)
• MCP server (tooling ecosystems and MCP hosts)
• Framework adapters (LangChain, CrewAI, AutoGen, Semantic Kernel)
• Native tool definitions (Anthropic, OpenAI, Gemini)

I want to build skills

• Author declarative skills as DAG workflows
• Reuse existing capability contracts
• Validate wiring and execution behavior
• Package and contribute reusable workflows

---

Mental model

Think of Agent Skills as:

• Capabilities: what an operation means (contract)
• Bindings: how that operation is executed (backend)
• Skills: how operations compose into workflows (DAG)
• Runtime: how workflows execute safely and observably

Cognitive Taxonomy

The pure cognitive layer is intentionally narrower than the full runtime. The current taxonomy separates:

• Pure cognitive capabilities: decision, evaluation, evidence, memory, perception, and reasoning.
• Compatibility surfaces: legacy or transitional names such as eval.* that remain in the live registry during migration.
• Operational capabilities: routing, delegation, workflow control, and other runtime helpers that should not be counted as core cognition.

The registry-level reference for that taxonomy is:

• agent-skill-registry/docs/COGNITIVE_TAXONOMY.md

Use that document as the source of truth when deciding whether a capability belongs to the cognitive core or to the operational layer.

---

Core concepts

Skills

Reusable cognitive workflows declared as DAGs.

Capabilities

Backend-agnostic contracts with typed inputs and outputs.

Bindings

Execution adapters for PythonCall, OpenAPI, MCP, and OpenRPC.

Runtime

Execution layer with DAG scheduling, policy gates, cognitive state, and trace.

---

Integration modes

Mode	Best for	Requires server?
Embedded SDK	Python apps and notebooks	No
Native tool defs	Direct model SDK integration	No
Framework adapters	Existing agent frameworks	No
MCP server	MCP-compatible hosts	MCP host
HTTP API	Service-oriented architectures	Yes

Embedded SDK (example)

from sdk.embedded import as_langchain_tools

tools = as_langchain_tools(["text.content.summarize", "text.content.translate"])

HTTP API (example)

agent-skills serve
curl http://localhost:8080/v1/health
curl -X POST http://localhost:8080/v1/skills/text.language-summary/execute \
  -H "Content-Type: application/json" \
  -d '{"inputs": {"text": "Hello world from ORCA"}}'

MCP server (example)

python -m official_mcp_servers
python -m official_mcp_servers --sse --host 0.0.0.0 --port 8765

Native tool definitions (example)

from sdk.embedded import as_openai_tools, execute_openai_tool_call

tools = as_openai_tools()
# pass tools to your OpenAI client, then dispatch tool calls via execute_openai_tool_call

---

Architecture

graph TB
    subgraph Interface
        CLI[CLI]
        HTTP[HTTP API]
        SDK[Embedded SDK / Adapters]
        MCP[MCP Server]
    end

    subgraph Runtime
        GW[Gateway]
        SCH[DAG Scheduler]
        POL[Policy and Safety]
        COG[CognitiveState]
        TRC[Trace and Audit]
    end

    subgraph BindingLayer
        RES[Binding Resolver]
        PY[PythonCall]
        OA[OpenAPI]
        MP[MCP]
        RP[OpenRPC]
    end

    subgraph Backends
        BASE[Deterministic Python baselines]
        EXT[External APIs and services]
        MCPB[MCP backends]
    end

    CLI --> GW
    HTTP --> GW
    SDK --> GW
    MCP --> GW

    GW --> SCH
    SCH --> POL
    SCH --> COG
    SCH --> TRC
    POL --> RES

    RES --> PY --> BASE
    RES --> OA --> EXT
    RES --> MP --> MCPB
    RES --> RP --> EXT

Loading

---

How it compares

Agent Skills is not a replacement for every agent framework.

It can run standalone, but its strongest use case is as a reusable execution layer underneath frameworks, tools, and model providers.

Dimension	Agent Skills	Typical agent framework
Execution model	Declarative DAG skills	Often prompt/tool loop centered
Contracts	Capability-first, typed	Usually app-level conventions
Backend portability	Binding abstraction layer	Often provider/framework specific
Safety/governance	Policy gates and execution controls	Varies widely
Observability	Trace and audit oriented	Varies widely
Local deterministic mode	Yes, baseline-first workflow	Often key-dependent

---

Advanced features

• Auth and RBAC controls
• Webhook eventing
• Plugin extension points
• Audit modes and runtime observability
• CognitiveState v1 and cognitive hints
• Runtime-managed output envelope (status, rationale, trace_ref)
• JSON Schema generation and validation
• Skill governance and conformance tooling

---

Cognitive quality gates (>9)

The runtime includes a quality gate bundle for pure cognitive capabilities.

Run the gate pack:

python tooling/run_cognitive_quality_gates.py \
  --report-file artifacts/cognitive_quality_gates_local_report.json

Generate scorecard only:

python tooling/generate_cognitive_quality_scorecard.py \
  --fail-on-threshold \
  --min-axis 9.0 \
  --min-overall 9.0

Primary artifacts:

• artifacts/cognitive_e2e_contract_report.json
• artifacts/cognitive_semantic_all_report.json
• artifacts/cognitive_quality_scorecard.json
• artifacts/cognitive_quality_gates_local_report.json

See docs index below for details.

---

Documentation

Topic	Link
10-minute onboarding	docs/ONBOARDING_10_MIN.md
Target architecture (canonical)	docs/TARGET_ARCHITECTURE.md
Installation	docs/INSTALLATION.md
Environment variables	docs/ENVIRONMENT_VARIABLES.md
Error taxonomy	docs/ERROR_TAXONOMY.md
Runner architecture	docs/RUNNER_GUIDE.md
Binding selection policy	docs/BINDING_SELECTION.md
Binding authoring guide	docs/BINDING_GUIDE.md
DAG scheduler	docs/SCHEDULER.md
Step control flow	docs/STEP_CONTROL_FLOW.md
Streaming	docs/STREAMING.md
Async execution	docs/ASYNC_EXECUTION.md
Deployment	docs/DEPLOYMENT.md
Observability	docs/OBSERVABILITY.md
Auth and RBAC	docs/AUTH.md
Webhooks	docs/WEBHOOKS.md
Plugins	docs/PLUGINS.md
JSON schemas	docs/JSON_SCHEMAS.md
Skill authoring	docs/SKILL_AUTHORING.md
Troubleshooting	docs/TROUBLESHOOTING.md
Public release use cases	docs/PUBLIC_RELEASE_USE_CASES.md
Project status	docs/PROJECT_STATUS.md
ORCA specification	ORCA.md

Serve docs locally:

make serve

---

Research paper

Beyond Prompting: Decoupling Cognition from Execution in LLM-based Agents through the ORCA Framework

Fernandez Alvarez, G. E. (2026)

• DOI: https://doi.org/10.5281/zenodo.19438943
• SSRN: https://papers.ssrn.com/sol3/papers.cfm?abstract_id=6600840
• Paper page: docs/PAPER.md

---

Contributing

Contributions are welcome. See CONTRIBUTING.md.

make check

---

License

Apache 2.0. See LICENSE.

---

Citing

If you use Agent Skills or ORCA in research, please cite:

@article{fernandez_orca_2026,
  author    = {Fernandez Alvarez, Guillermo E.},
  title     = {Beyond Prompting: Decoupling Cognition from Execution in
               LLM-based Agents through the ORCA Framework},
  year      = {2026},
  publisher = {Zenodo},
  doi       = {10.5281/zenodo.19438943},
  url       = {https://doi.org/10.5281/zenodo.19438943}
}

Software citation:

@software{fernandez_agent_skills_2026,
  author       = {Fernandez Alvarez, Guillermo},
  title        = {Agent Skills Runtime},
  year         = {2026},
  url          = {https://github.com/gfernandf/agent-skills},
  version      = {1.0.2},
  license      = {Apache-2.0}
}

See also CITATION.cff.

---

Troubleshooting

Problem	Solution
Registry not found	Run doctor and ensure agent-skill-registry is cloned next to this repo
Command not found on Windows	Use python skills.py ... from repo root
Unexpected runtime error	Check docs/ERROR_TAXONOMY.md
Environment mismatch	Review docs/ENVIRONMENT_VARIABLES.md