Using Agent Skills with the API

Learn how to use Agent Skills to extend Claude’s capabilities through the API.

Agent Skills extend Claude’s capabilities through organized folders of instructions, scripts, and resources. This guide shows you how to use both pre-built and custom Skills with the Claude API.

For complete API reference including request/response schemas and all parameters, see:

Skill Management API Reference - CRUD operations for Skills
Skill Versions API Reference - Version management

Quick Links

Get started with Agent Skills

Create your first Skill

Create Custom Skills

Best practices for authoring Skills

Overview

For a deep dive into the architecture and real-world applications of Agent Skills, read our engineering blog: Equipping agents for the real world with Agent Skills.

Skills integrate with the Messages API through the code execution tool. Whether using pre-built Skills managed by Anthropic or custom Skills you’ve uploaded, the integration shape is identical—both require code execution and use the same container structure.

Using Skills

Skills integrate identically in the Messages API regardless of source. You specify Skills in the container parameter with a skill_id, type, and optional version, and they execute in the code execution environment. You can use Skills from two sources:

Aspect	Anthropic Skills	Custom Skills
Type value	`anthropic`	`custom`
Skill IDs	Short names: `pptx`, `xlsx`, `docx`, `pdf`	Generated: `skill_01AbCdEfGhIjKlMnOpQrStUv`
Version format	Date-based: `20251013` or `latest`	Epoch timestamp: `1759178010641129` or `latest`
Management	Pre-built and maintained by Anthropic	Upload and manage via Skills API
Availability	Available to all users	Private to your workspace

Both skill sources are returned by the List Skills endpoint (use the source parameter to filter). The integration shape and execution environment are identical—the only difference is where the Skills come from and how they’re managed.

Prerequisites

To use Skills, you need:

Anthropic API key from the Console
Beta headers:
- code-execution-2025-08-25 - Enables code execution (required for Skills)
- skills-2025-10-02 - Enables Skills API
- files-api-2025-04-14 - For uploading/downloading files to/from container
Code execution tool enabled in your requests

Using Skills in Messages

Container Parameter

Skills are specified using the container parameter in the Messages API. You can include up to 8 Skills per request. The structure is identical for both Anthropic and custom Skills—specify the required type and skill_id, and optionally include version to pin to a specific version:

import anthropic

client = anthropic.Anthropic()

response = client.beta.messages.create(
    model="claude-sonnet-4-5-20250929",
    max_tokens=4096,
    betas=["code-execution-2025-08-25", "skills-2025-10-02"],
    container={
        "skills": [
            {
                "type": "anthropic",
                "skill_id": "pptx",
                "version": "latest"
            }
        ]
    },
    messages=[{
        "role": "user",
        "content": "Create a presentation about renewable energy"
    }],
    tools=[{
        "type": "code_execution_20250825",
        "name": "code_execution"
    }]
)

import Anthropic from '@anthropic-ai/sdk';

const client = new Anthropic();

const response = await client.beta.messages.create({
  model: 'claude-sonnet-4-5-20250929',
  max_tokens: 4096,
  betas: ['code-execution-2025-08-25', 'skills-2025-10-02'],
  container: {
    skills: [
      {
        type: 'anthropic',
        skill_id: 'pptx',
        version: 'latest'
      }
    ]
  },
  messages: [{
    role: 'user',
    content: 'Create a presentation about renewable energy'
  }],
  tools: [{
    type: 'code_execution_20250825',
    name: 'code_execution'
  }]
});

curl https://api.anthropic.com/v1/messages \
  -H "x-api-key: $ANTHROPIC_API_KEY" \
  -H "anthropic-version: 2023-06-01" \
  -H "anthropic-beta: code-execution-2025-08-25,skills-2025-10-02" \
  -H "content-type: application/json" \
  -d '{
    "model": "claude-sonnet-4-5-20250929",
    "max_tokens": 4096,
    "container": {
      "skills": [
        {
          "type": "anthropic",
          "skill_id": "pptx",
          "version": "latest"
        }
      ]
    },
    "messages": [{
      "role": "user",
      "content": "Create a presentation about renewable energy"
    }],
    "tools": [{
      "type": "code_execution_20250825",
      "name": "code_execution"
    }]
  }'

Downloading Generated Files

When Skills create documents (Excel, PowerPoint, PDF, Word), they return file_id attributes in the response. You must use the Files API to download these files. How it works:

Skills create files during code execution
Response includes file_id for each created file
Use Files API to download the actual file content
Save locally or process as needed

Example: Creating and downloading an Excel file

import anthropic

client = anthropic.Anthropic()

# Step 1: Use a Skill to create a file
response = client.beta.messages.create(
    model="claude-sonnet-4-5-20250929",
    max_tokens=4096,
    betas=["code-execution-2025-08-25", "skills-2025-10-02"],
    container={
        "skills": [
            {"type": "anthropic", "skill_id": "xlsx", "version": "latest"}
        ]
    },
    messages=[{
        "role": "user",
        "content": "Create an Excel file with a simple budget spreadsheet"
    }],
    tools=[{"type": "code_execution_20250825", "name": "code_execution"}]
)

# Step 2: Extract file IDs from the response
def extract_file_ids(response):
    file_ids = []
    for item in response.content:
        if item.type == 'bash_code_execution_tool_result':
            content_item = item.content
            if content_item.type == 'bash_code_execution_result':
                for file in content_item.content:
                    if hasattr(file, 'file_id'):
                        file_ids.append(file.file_id)
    return file_ids

# Step 3: Download the file using Files API
for file_id in extract_file_ids(response):
    file_metadata = client.beta.files.retrieve_metadata(
        file_id=file_id,
        betas=["files-api-2025-04-14"]
    )
    file_content = client.beta.files.download(
        file_id=file_id,
        betas=["files-api-2025-04-14"]
    )

    # Step 4: Save to disk
    file_content.write_to_file(file_metadata.filename)
    print(f"Downloaded: {file_metadata.filename}")

import Anthropic from '@anthropic-ai/sdk';

const client = new Anthropic();

// Step 1: Use a Skill to create a file
const response = await client.beta.messages.create({
  model: 'claude-sonnet-4-5-20250929',
  max_tokens: 4096,
  betas: ['code-execution-2025-08-25', 'skills-2025-10-02'],
  container: {
    skills: [
      {type: 'anthropic', skill_id: 'xlsx', version: 'latest'}
    ]
  },
  messages: [{
    role: 'user',
    content: 'Create an Excel file with a simple budget spreadsheet'
  }],
  tools: [{type: 'code_execution_20250825', name: 'code_execution'}]
});

// Step 2: Extract file IDs from the response
function extractFileIds(response: any): string[] {
  const fileIds: string[] = [];
  for (const item of response.content) {
    if (item.type === 'bash_code_execution_tool_result') {
      const contentItem = item.content;
      if (contentItem.type === 'bash_code_execution_result') {
        for (const file of contentItem.content) {
          if ('file_id' in file) {
            fileIds.push(file.file_id);
          }
        }
      }
    }
  }
  return fileIds;
}

// Step 3: Download the file using Files API
const fs = require('fs');
for (const fileId of extractFileIds(response)) {
  const fileMetadata = await client.beta.files.retrieve_metadata(fileId, {
    betas: ['files-api-2025-04-14']
  });
  const fileContent = await client.beta.files.download(fileId, {
    betas: ['files-api-2025-04-14']
  });

  // Step 4: Save to disk
  fs.writeFileSync(fileMetadata.filename, Buffer.from(await fileContent.arrayBuffer()));
  console.log(`Downloaded: ${fileMetadata.filename}`);
}

# Step 1: Use a Skill to create a file
RESPONSE=$(curl https://api.anthropic.com/v1/messages \
  -H "x-api-key: $ANTHROPIC_API_KEY" \
  -H "anthropic-version: 2023-06-01" \
  -H "anthropic-beta: code-execution-2025-08-25,skills-2025-10-02" \
  -H "content-type: application/json" \
  -d '{
    "model": "claude-sonnet-4-5-20250929",
    "max_tokens": 4096,
    "container": {
      "skills": [
        {"type": "anthropic", "skill_id": "xlsx", "version": "latest"}
      ]
    },
    "messages": [{
      "role": "user",
      "content": "Create an Excel file with a simple budget spreadsheet"
    }],
    "tools": [{
      "type": "code_execution_20250825",
      "name": "code_execution"
    }]
  }')

# Step 2: Extract file_id from response (using jq)
FILE_ID=$(echo "$RESPONSE" | jq -r '.content[] | select(.type=="bash_code_execution_tool_result") | .content | select(.type=="bash_code_execution_result") | .content[] | select(.file_id) | .file_id')

# Step 3: Get filename from metadata
FILENAME=$(curl "https://api.anthropic.com/v1/files/$FILE_ID" \
  -H "x-api-key: $ANTHROPIC_API_KEY" \
  -H "anthropic-version: 2023-06-01" \
  -H "anthropic-beta: files-api-2025-04-14" | jq -r '.filename')

# Step 4: Download the file using Files API
curl "https://api.anthropic.com/v1/files/$FILE_ID/content" \
  -H "x-api-key: $ANTHROPIC_API_KEY" \
  -H "anthropic-version: 2023-06-01" \
  -H "anthropic-beta: files-api-2025-04-14" \
  --output "$FILENAME"

echo "Downloaded: $FILENAME"

Additional Files API operations:

# Get file metadata
file_info = client.beta.files.retrieve_metadata(
    file_id=file_id,
    betas=["files-api-2025-04-14"]
)
print(f"Filename: {file_info.filename}, Size: {file_info.size_bytes} bytes")

# List all files
files = client.beta.files.list(betas=["files-api-2025-04-14"])
for file in files.data:
    print(f"{file.filename} - {file.created_at}")

# Delete a file
client.beta.files.delete(
    file_id=file_id,
    betas=["files-api-2025-04-14"]
)

// Get file metadata
const fileInfo = await client.beta.files.retrieve_metadata(fileId, {
  betas: ['files-api-2025-04-14']
});
console.log(`Filename: ${fileInfo.filename}, Size: ${fileInfo.size_bytes} bytes`);

// List all files
const files = await client.beta.files.list({
  betas: ['files-api-2025-04-14']
});
for (const file of files.data) {
  console.log(`${file.filename} - ${file.created_at}`);
}

// Delete a file
await client.beta.files.delete(fileId, {
  betas: ['files-api-2025-04-14']
});

# Get file metadata
curl "https://api.anthropic.com/v1/files/$FILE_ID" \
  -H "x-api-key: $ANTHROPIC_API_KEY" \
  -H "anthropic-version: 2023-06-01" \
  -H "anthropic-beta: files-api-2025-04-14"

# List all files
curl "https://api.anthropic.com/v1/files" \
  -H "x-api-key: $ANTHROPIC_API_KEY" \
  -H "anthropic-version: 2023-06-01" \
  -H "anthropic-beta: files-api-2025-04-14"

# Delete a file
curl -X DELETE "https://api.anthropic.com/v1/files/$FILE_ID" \
  -H "x-api-key: $ANTHROPIC_API_KEY" \
  -H "anthropic-version: 2023-06-01" \
  -H "anthropic-beta: files-api-2025-04-14"

For complete details on the Files API, see the Files API documentation.

Multi-Turn Conversations

Reuse the same container across multiple messages by specifying the container ID:

# First request creates container
response1 = client.beta.messages.create(
    model="claude-sonnet-4-5-20250929",
    max_tokens=4096,
    betas=["code-execution-2025-08-25", "skills-2025-10-02"],
    container={
        "skills": [
            {"type": "anthropic", "skill_id": "xlsx", "version": "latest"}
        ]
    },
    messages=[{"role": "user", "content": "Analyze this sales data"}],
    tools=[{"type": "code_execution_20250825", "name": "code_execution"}]
)

# Continue conversation with same container
messages = [
    {"role": "user", "content": "Analyze this sales data"},
    {"role": "assistant", "content": response1.content},
    {"role": "user", "content": "What was the total revenue?"}
]

response2 = client.beta.messages.create(
    model="claude-sonnet-4-5-20250929",
    max_tokens=4096,
    betas=["code-execution-2025-08-25", "skills-2025-10-02"],
    container={
        "id": response1.container.id,  # Reuse container
        "skills": [
            {"type": "anthropic", "skill_id": "xlsx", "version": "latest"}
        ]
    },
    messages=messages,
    tools=[{"type": "code_execution_20250825", "name": "code_execution"}]
)

// First request creates container
const response1 = await client.beta.messages.create({
  model: 'claude-sonnet-4-5-20250929',
  max_tokens: 4096,
  betas: ['code-execution-2025-08-25', 'skills-2025-10-02'],
  container: {
    skills: [
      {type: 'anthropic', skill_id: 'xlsx', version: 'latest'}
    ]
  },
  messages: [{role: 'user', content: 'Analyze this sales data'}],
  tools: [{type: 'code_execution_20250825', name: 'code_execution'}]
});

// Continue conversation with same container
const messages = [
  {role: 'user', content: 'Analyze this sales data'},
  {role: 'assistant', content: response1.content},
  {role: 'user', content: 'What was the total revenue?'}
];

const response2 = await client.beta.messages.create({
  model: 'claude-sonnet-4-5-20250929',
  max_tokens: 4096,
  betas: ['code-execution-2025-08-25', 'skills-2025-10-02'],
  container: {
    id: response1.container.id,  // Reuse container
    skills: [
      {type: 'anthropic', skill_id: 'xlsx', version: 'latest'}
    ]
  },
  messages,
  tools: [{type: 'code_execution_20250825', name: 'code_execution'}]
});

Long-Running Operations

Skills may perform operations that require multiple turns. Handle pause_turn stop reasons:

messages = [{"role": "user", "content": "Process this large dataset"}]
max_retries = 10

response = client.beta.messages.create(
    model="claude-sonnet-4-5-20250929",
    max_tokens=4096,
    betas=["code-execution-2025-08-25", "skills-2025-10-02"],
    container={
        "skills": [
            {"type": "custom", "skill_id": "skill_01AbCdEfGhIjKlMnOpQrStUv", "version": "latest"}
        ]
    },
    messages=messages,
    tools=[{"type": "code_execution_20250825", "name": "code_execution"}]
)

# Handle pause_turn for long operations
for i in range(max_retries):
    if response.stop_reason != "pause_turn":
        break

    messages.append({"role": "assistant", "content": response.content})
    response = client.beta.messages.create(
        model="claude-sonnet-4-5-20250929",
        max_tokens=4096,
        betas=["code-execution-2025-08-25", "skills-2025-10-02"],
        container={
            "id": response.container.id,
            "skills": [
                {"type": "custom", "skill_id": "skill_01AbCdEfGhIjKlMnOpQrStUv", "version": "latest"}
            ]
        },
        messages=messages,
        tools=[{"type": "code_execution_20250825", "name": "code_execution"}]
    )

let messages = [{role: 'user' as const, content: 'Process this large dataset'}];
const maxRetries = 10;

let response = await client.beta.messages.create({
  model: 'claude-sonnet-4-5-20250929',
  max_tokens: 4096,
  betas: ['code-execution-2025-08-25', 'skills-2025-10-02'],
  container: {
    skills: [
      {type: 'custom', skill_id: 'skill_01AbCdEfGhIjKlMnOpQrStUv', version: 'latest'}
    ]
  },
  messages,
  tools: [{type: 'code_execution_20250825', name: 'code_execution'}]
});

// Handle pause_turn for long operations
for (let i = 0; i < maxRetries; i++) {
  if (response.stop_reason !== 'pause_turn') {
    break;
  }

  messages.push({role: 'assistant', content: response.content});
  response = await client.beta.messages.create({
    model: 'claude-sonnet-4-5-20250929',
    max_tokens: 4096,
    betas: ['code-execution-2025-08-25', 'skills-2025-10-02'],
    container: {
      id: response.container.id,
      skills: [
        {type: 'custom', skill_id: 'skill_01AbCdEfGhIjKlMnOpQrStUv', version: 'latest'}
      ]
    },
    messages,
    tools: [{type: 'code_execution_20250825', name: 'code_execution'}]
  });
}

# Initial request
RESPONSE=$(curl https://api.anthropic.com/v1/messages \
  -H "x-api-key: $ANTHROPIC_API_KEY" \
  -H "anthropic-version: 2023-06-01" \
  -H "anthropic-beta: code-execution-2025-08-25,skills-2025-10-02" \
  -H "content-type: application/json" \
  -d '{
    "model": "claude-sonnet-4-5-20250929",
    "max_tokens": 4096,
    "container": {
      "skills": [
        {
          "type": "custom",
          "skill_id": "skill_01AbCdEfGhIjKlMnOpQrStUv",
          "version": "latest"
        }
      ]
    },
    "messages": [{
      "role": "user",
      "content": "Process this large dataset"
    }],
    "tools": [{
      "type": "code_execution_20250825",
      "name": "code_execution"
    }]
  }')

# Check stop_reason and handle pause_turn in a loop
STOP_REASON=$(echo "$RESPONSE" | jq -r '.stop_reason')
CONTAINER_ID=$(echo "$RESPONSE" | jq -r '.container.id')

while [ "$STOP_REASON" = "pause_turn" ]; do
  # Continue with same container
  RESPONSE=$(curl https://api.anthropic.com/v1/messages \
    -H "x-api-key: $ANTHROPIC_API_KEY" \
    -H "anthropic-version: 2023-06-01" \
    -H "anthropic-beta: code-execution-2025-08-25,skills-2025-10-02" \
    -H "content-type: application/json" \
    -d "{
      \"model\": \"claude-sonnet-4-5-20250929\",
      \"max_tokens\": 4096,
      \"container\": {
        \"id\": \"$CONTAINER_ID\",
        \"skills\": [{
          \"type\": \"custom\",
          \"skill_id\": \"skill_01AbCdEfGhIjKlMnOpQrStUv\",
          \"version\": \"latest\"
        }]
      },
      \"messages\": [/* include conversation history */],
      \"tools\": [{
        \"type\": \"code_execution_20250825\",
        \"name\": \"code_execution\"
      }]
    }")

  STOP_REASON=$(echo "$RESPONSE" | jq -r '.stop_reason')
done

The response may include a pause_turn stop reason, which indicates that the API paused a long-running Skill operation. You can provide the response back as-is in a subsequent request to let Claude continue its turn, or modify the content if you wish to interrupt the conversation and provide additional guidance.

Using Multiple Skills

Combine multiple Skills in a single request to handle complex workflows:

response = client.beta.messages.create(
    model="claude-sonnet-4-5-20250929",
    max_tokens=4096,
    betas=["code-execution-2025-08-25", "skills-2025-10-02"],
    container={
        "skills": [
            {
                "type": "anthropic",
                "skill_id": "xlsx",
                "version": "latest"
            },
            {
                "type": "anthropic",
                "skill_id": "pptx",
                "version": "latest"
            },
            {
                "type": "custom",
                "skill_id": "skill_01AbCdEfGhIjKlMnOpQrStUv",
                "version": "latest"
            }
        ]
    },
    messages=[{
        "role": "user",
        "content": "Analyze sales data and create a presentation"
    }],
    tools=[{
        "type": "code_execution_20250825",
        "name": "code_execution"
    }]
)

const response = await client.beta.messages.create({
  model: 'claude-sonnet-4-5-20250929',
  max_tokens: 4096,
  betas: ['code-execution-2025-08-25', 'skills-2025-10-02'],
  container: {
    skills: [
      {
        type: 'anthropic',
        skill_id: 'xlsx',
        version: 'latest'
      },
      {
        type: 'anthropic',
        skill_id: 'pptx',
        version: 'latest'
      },
      {
        type: 'custom',
        skill_id: 'skill_01AbCdEfGhIjKlMnOpQrStUv',
        version: 'latest'
      }
    ]
  },
  messages: [{
    role: 'user',
    content: 'Analyze sales data and create a presentation'
  }],
  tools: [{
    type: 'code_execution_20250825',
    name: 'code_execution'
  }]
});

curl https://api.anthropic.com/v1/messages \
  -H "x-api-key: $ANTHROPIC_API_KEY" \
  -H "anthropic-version: 2023-06-01" \
  -H "anthropic-beta: code-execution-2025-08-25,skills-2025-10-02" \
  -H "content-type: application/json" \
  -d '{
    "model": "claude-sonnet-4-5-20250929",
    "max_tokens": 4096,
    "container": {
      "skills": [
        {
          "type": "anthropic",
          "skill_id": "xlsx",
          "version": "latest"
        },
        {
          "type": "anthropic",
          "skill_id": "pptx",
          "version": "latest"
        },
        {
          "type": "custom",
          "skill_id": "skill_01AbCdEfGhIjKlMnOpQrStUv",
          "version": "latest"
        }
      ]
    },
    "messages": [{
      "role": "user",
      "content": "Analyze sales data and create a presentation"
    }],
    "tools": [{
      "type": "code_execution_20250825",
      "name": "code_execution"
    }]
  }'

Managing Custom Skills

Creating a Skill

Upload your custom Skill to make it available in your workspace. You can upload using either a directory path or individual file objects.

import anthropic

client = anthropic.Anthropic()

# Option 1: Using files_from_dir helper (Python only, recommended)
from anthropic.lib import files_from_dir

skill = client.beta.skills.create(
    display_title="Financial Analysis",
    files=files_from_dir("/path/to/financial_analysis_skill"),
    betas=["skills-2025-10-02"]
)

# Option 2: Using a zip file
skill = client.beta.skills.create(
    display_title="Financial Analysis",
    files=[("skill.zip", open("financial_analysis_skill.zip", "rb"))],
    betas=["skills-2025-10-02"]
)

# Option 3: Using file tuples (filename, file_content, mime_type)
skill = client.beta.skills.create(
    display_title="Financial Analysis",
    files=[
        ("financial_skill/SKILL.md", open("financial_skill/SKILL.md", "rb"), "text/markdown"),
        ("financial_skill/analyze.py", open("financial_skill/analyze.py", "rb"), "text/x-python"),
    ],
    betas=["skills-2025-10-02"]
)

print(f"Created skill: {skill.id}")
print(f"Latest version: {skill.latest_version}")

import Anthropic, { toFile } from '@anthropic-ai/sdk';
import fs from 'fs';

const client = new Anthropic();

// Option 1: Using a zip file
const skill = await client.beta.skills.create({
  displayTitle: 'Financial Analysis',
  files: [
    await toFile(
      fs.createReadStream('financial_analysis_skill.zip'),
      'skill.zip'
    )
  ],
  betas: ['skills-2025-10-02']
});

// Option 2: Using individual file objects
const skill = await client.beta.skills.create({
  displayTitle: 'Financial Analysis',
  files: [
    await toFile(
      fs.createReadStream('financial_skill/SKILL.md'),
      'financial_skill/SKILL.md',
      { type: 'text/markdown' }
    ),
    await toFile(
      fs.createReadStream('financial_skill/analyze.py'),
      'financial_skill/analyze.py',
      { type: 'text/x-python' }
    ),
  ],
  betas: ['skills-2025-10-02']
});

console.log(`Created skill: ${skill.id}`);
console.log(`Latest version: ${skill.latest_version}`);

curl -X POST "https://api.anthropic.com/v1/skills" \
  -H "x-api-key: $ANTHROPIC_API_KEY" \
  -H "anthropic-version: 2023-06-01" \
  -H "anthropic-beta: skills-2025-10-02" \
  -F "display_title=Financial Analysis" \
  -F "files[]=@financial_skill/SKILL.md;filename=financial_skill/SKILL.md" \
  -F "files[]=@financial_skill/analyze.py;filename=financial_skill/analyze.py"

Requirements:

Must include a SKILL.md file at the top level
All files must specify a common root directory in their paths
Total upload size must be under 8MB
YAML frontmatter requirements:
- name: Maximum 64 characters, lowercase letters/numbers/hyphens only, no XML tags, no reserved words (“anthropic”, “claude”)
- description: Maximum 1024 characters, non-empty, no XML tags

For complete request/response schemas, see the Create Skill API reference.

Listing Skills

Retrieve all Skills available to your workspace, including both Anthropic pre-built Skills and your custom Skills. Use the source parameter to filter by skill type:

# List all Skills
skills = client.beta.skills.list(
    betas=["skills-2025-10-02"]
)

for skill in skills.data:
    print(f"{skill.id}: {skill.display_title} (source: {skill.source})")

# List only custom Skills
custom_skills = client.beta.skills.list(
    source="custom",
    betas=["skills-2025-10-02"]
)

// List all Skills
const skills = await client.beta.skills.list({
  betas: ['skills-2025-10-02']
});

for (const skill of skills.data) {
  console.log(`${skill.id}: ${skill.display_title} (source: ${skill.source})`);
}

// List only custom Skills
const customSkills = await client.beta.skills.list({
  source: 'custom',
  betas: ['skills-2025-10-02']
});

# List all Skills
curl "https://api.anthropic.com/v1/skills" \
  -H "x-api-key: $ANTHROPIC_API_KEY" \
  -H "anthropic-version: 2023-06-01" \
  -H "anthropic-beta: skills-2025-10-02"

# List only custom Skills
curl "https://api.anthropic.com/v1/skills?source=custom" \
  -H "x-api-key: $ANTHROPIC_API_KEY" \
  -H "anthropic-version: 2023-06-01" \
  -H "anthropic-beta: skills-2025-10-02"

See the List Skills API reference for pagination and filtering options.

Retrieving a Skill

Get details about a specific Skill:

skill = client.beta.skills.retrieve(
    skill_id="skill_01AbCdEfGhIjKlMnOpQrStUv",
    betas=["skills-2025-10-02"]
)

print(f"Skill: {skill.display_title}")
print(f"Latest version: {skill.latest_version}")
print(f"Created: {skill.created_at}")

const skill = await client.beta.skills.retrieve(
  'skill_01AbCdEfGhIjKlMnOpQrStUv',
  { betas: ['skills-2025-10-02'] }
);

console.log(`Skill: ${skill.display_title}`);
console.log(`Latest version: ${skill.latest_version}`);
console.log(`Created: ${skill.created_at}`);

curl "https://api.anthropic.com/v1/skills/skill_01AbCdEfGhIjKlMnOpQrStUv" \
  -H "x-api-key: $ANTHROPIC_API_KEY" \
  -H "anthropic-version: 2023-06-01" \
  -H "anthropic-beta: skills-2025-10-02"

Deleting a Skill

To delete a Skill, you must first delete all its versions:

# Step 1: Delete all versions
versions = client.beta.skills.versions.list(
    skill_id="skill_01AbCdEfGhIjKlMnOpQrStUv",
    betas=["skills-2025-10-02"]
)

for version in versions.data:
    client.beta.skills.versions.delete(
        skill_id="skill_01AbCdEfGhIjKlMnOpQrStUv",
        version=version.version,
        betas=["skills-2025-10-02"]
    )

# Step 2: Delete the Skill
client.beta.skills.delete(
    skill_id="skill_01AbCdEfGhIjKlMnOpQrStUv",
    betas=["skills-2025-10-02"]
)

// Step 1: Delete all versions
const versions = await client.beta.skills.versions.list(
  'skill_01AbCdEfGhIjKlMnOpQrStUv',
  { betas: ['skills-2025-10-02'] }
);

for (const version of versions.data) {
  await client.beta.skills.versions.delete(
    'skill_01AbCdEfGhIjKlMnOpQrStUv',
    version.version,
    { betas: ['skills-2025-10-02'] }
  );
}

// Step 2: Delete the Skill
await client.beta.skills.delete(
  'skill_01AbCdEfGhIjKlMnOpQrStUv',
  { betas: ['skills-2025-10-02'] }
);

# Delete all versions first, then delete the Skill
curl -X DELETE "https://api.anthropic.com/v1/skills/skill_01AbCdEfGhIjKlMnOpQrStUv" \
  -H "x-api-key: $ANTHROPIC_API_KEY" \
  -H "anthropic-version: 2023-06-01" \
  -H "anthropic-beta: skills-2025-10-02"

Attempting to delete a Skill with existing versions will return a 400 error.

Versioning

Skills support versioning to manage updates safely: Anthropic-Managed Skills:

Versions use date format: 20251013
New versions released as updates are made
Specify exact versions for stability

Custom Skills:

Auto-generated epoch timestamps: 1759178010641129
Use "latest" to always get the most recent version
Create new versions when updating Skill files

# Create a new version
from anthropic.lib import files_from_dir

new_version = client.beta.skills.versions.create(
    skill_id="skill_01AbCdEfGhIjKlMnOpQrStUv",
    files=files_from_dir("/path/to/updated_skill"),
    betas=["skills-2025-10-02"]
)

# Use specific version
response = client.beta.messages.create(
    model="claude-sonnet-4-5-20250929",
    max_tokens=4096,
    betas=["code-execution-2025-08-25", "skills-2025-10-02"],
    container={
        "skills": [{
            "type": "custom",
            "skill_id": "skill_01AbCdEfGhIjKlMnOpQrStUv",
            "version": new_version.version
        }]
    },
    messages=[{"role": "user", "content": "Use updated Skill"}],
    tools=[{"type": "code_execution_20250825", "name": "code_execution"}]
)

# Use latest version
response = client.beta.messages.create(
    model="claude-sonnet-4-5-20250929",
    max_tokens=4096,
    betas=["code-execution-2025-08-25", "skills-2025-10-02"],
    container={
        "skills": [{
            "type": "custom",
            "skill_id": "skill_01AbCdEfGhIjKlMnOpQrStUv",
            "version": "latest"
        }]
    },
    messages=[{"role": "user", "content": "Use latest Skill version"}],
    tools=[{"type": "code_execution_20250825", "name": "code_execution"}]
)

// Create a new version using a zip file
const fs = require('fs');

const newVersion = await client.beta.skills.versions.create(
  'skill_01AbCdEfGhIjKlMnOpQrStUv',
  {
    files: [
      fs.createReadStream('updated_skill.zip')
    ],
    betas: ['skills-2025-10-02']
  }
);

// Use specific version
const response = await client.beta.messages.create({
  model: 'claude-sonnet-4-5-20250929',
  max_tokens: 4096,
  betas: ['code-execution-2025-08-25', 'skills-2025-10-02'],
  container: {
    skills: [{
      type: 'custom',
      skill_id: 'skill_01AbCdEfGhIjKlMnOpQrStUv',
      version: newVersion.version
    }]
  },
  messages: [{role: 'user', content: 'Use updated Skill'}],
  tools: [{type: 'code_execution_20250825', name: 'code_execution'}]
});

// Use latest version
const response = await client.beta.messages.create({
  model: 'claude-sonnet-4-5-20250929',
  max_tokens: 4096,
  betas: ['code-execution-2025-08-25', 'skills-2025-10-02'],
  container: {
    skills: [{
      type: 'custom',
      skill_id: 'skill_01AbCdEfGhIjKlMnOpQrStUv',
      version: 'latest'
    }]
  },
  messages: [{role: 'user', content: 'Use latest Skill version'}],
  tools: [{type: 'code_execution_20250825', name: 'code_execution'}]
});

# Create a new version
NEW_VERSION=$(curl -X POST "https://api.anthropic.com/v1/skills/skill_01AbCdEfGhIjKlMnOpQrStUv/versions" \
  -H "x-api-key: $ANTHROPIC_API_KEY" \
  -H "anthropic-version: 2023-06-01" \
  -H "anthropic-beta: skills-2025-10-02" \
  -F "files[]=@updated_skill/SKILL.md;filename=updated_skill/SKILL.md")

VERSION_NUMBER=$(echo "$NEW_VERSION" | jq -r '.version')

# Use specific version
curl https://api.anthropic.com/v1/messages \
  -H "x-api-key: $ANTHROPIC_API_KEY" \
  -H "anthropic-version: 2023-06-01" \
  -H "anthropic-beta: code-execution-2025-08-25,skills-2025-10-02" \
  -H "content-type: application/json" \
  -d "{
    \"model\": \"claude-sonnet-4-5-20250929\",
    \"max_tokens\": 4096,
    \"container\": {
      \"skills\": [{
        \"type\": \"custom\",
        \"skill_id\": \"skill_01AbCdEfGhIjKlMnOpQrStUv\",
        \"version\": \"$VERSION_NUMBER\"
      }]
    },
    \"messages\": [{\"role\": \"user\", \"content\": \"Use updated Skill\"}],
    \"tools\": [{\"type\": \"code_execution_20250825\", \"name\": \"code_execution\"}]
  }"

# Use latest version
curl https://api.anthropic.com/v1/messages \
  -H "x-api-key: $ANTHROPIC_API_KEY" \
  -H "anthropic-version: 2023-06-01" \
  -H "anthropic-beta: code-execution-2025-08-25,skills-2025-10-02" \
  -H "content-type: application/json" \
  -d '{
    "model": "claude-sonnet-4-5-20250929",
    "max_tokens": 4096,
    "container": {
      "skills": [{
        "type": "custom",
        "skill_id": "skill_01AbCdEfGhIjKlMnOpQrStUv",
        "version": "latest"
      }]
    },
    "messages": [{"role": "user", "content": "Use latest Skill version"}],
    "tools": [{"type": "code_execution_20250825", "name": "code_execution"}]
  }'

See the Create Skill Version API reference for complete details.

How Skills Are Loaded

When you specify Skills in a container:

Metadata Discovery: Claude sees metadata for each Skill (name, description) in the system prompt
File Loading: Skill files are copied into the container at /skills/{directory}/
Automatic Use: Claude automatically loads and uses Skills when relevant to your request
Composition: Multiple Skills compose together for complex workflows

The progressive disclosure architecture ensures efficient context usage—Claude only loads full Skill instructions when needed.

Use Cases

Organizational Skills

Brand & Communications

Apply company-specific formatting (colors, fonts, layouts) to documents
Generate communications following organizational templates
Ensure consistent brand guidelines across all outputs

Project Management

Structure notes with company-specific formats (OKRs, decision logs)
Generate tasks following team conventions
Create standardized meeting recaps and status updates

Business Operations

Create company-standard reports, proposals, and analyses
Execute company-specific analytical procedures
Generate financial models following organizational templates

Personal Skills

Content Creation

Custom document templates
Specialized formatting and styling
Domain-specific content generation

Data Analysis

Custom data processing pipelines
Specialized visualization templates
Industry-specific analytical methods

Development & Automation

Code generation templates
Testing frameworks
Deployment workflows

Example: Financial Modeling

Combine Excel and custom DCF analysis Skills:

# Create custom DCF analysis Skill
from anthropic.lib import files_from_dir

dcf_skill = client.beta.skills.create(
    display_title="DCF Analysis",
    files=files_from_dir("/path/to/dcf_skill"),
    betas=["skills-2025-10-02"]
)

# Use with Excel to create financial model
response = client.beta.messages.create(
    model="claude-sonnet-4-5-20250929",
    max_tokens=4096,
    betas=["code-execution-2025-08-25", "skills-2025-10-02"],
    container={
        "skills": [
            {"type": "anthropic", "skill_id": "xlsx", "version": "latest"},
            {"type": "custom", "skill_id": dcf_skill.id, "version": "latest"}
        ]
    },
    messages=[{
        "role": "user",
        "content": "Build a DCF valuation model for a SaaS company with the attached financials"
    }],
    tools=[{"type": "code_execution_20250825", "name": "code_execution"}]
)

// Create custom DCF analysis Skill
import { toFile } from '@anthropic-ai/sdk';
import fs from 'fs';

const dcfSkill = await client.beta.skills.create({
  displayTitle: 'DCF Analysis',
  files: [
    await toFile(fs.createReadStream('dcf_skill.zip'), 'skill.zip')
  ],
  betas: ['skills-2025-10-02']
});

// Use with Excel to create financial model
const response = await client.beta.messages.create({
  model: 'claude-sonnet-4-5-20250929',
  max_tokens: 4096,
  betas: ['code-execution-2025-08-25', 'skills-2025-10-02'],
  container: {
    skills: [
      {type: 'anthropic', skill_id: 'xlsx', version: 'latest'},
      {type: 'custom', skill_id: dcfSkill.id, version: 'latest'}
    ]
  },
  messages: [{
    role: 'user',
    content: 'Build a DCF valuation model for a SaaS company with the attached financials'
  }],
  tools: [{type: 'code_execution_20250825', name: 'code_execution'}]
});

# Create custom DCF analysis Skill
DCF_SKILL=$(curl -X POST "https://api.anthropic.com/v1/skills" \
  -H "x-api-key: $ANTHROPIC_API_KEY" \
  -H "anthropic-version: 2023-06-01" \
  -H "anthropic-beta: skills-2025-10-02" \
  -F "display_title=DCF Analysis" \
  -F "files[]=@dcf_skill/SKILL.md;filename=dcf_skill/SKILL.md")

DCF_SKILL_ID=$(echo "$DCF_SKILL" | jq -r '.id')

# Use with Excel to create financial model
curl https://api.anthropic.com/v1/messages \
  -H "x-api-key: $ANTHROPIC_API_KEY" \
  -H "anthropic-version: 2023-06-01" \
  -H "anthropic-beta: code-execution-2025-08-25,skills-2025-10-02" \
  -H "content-type: application/json" \
  -d "{
    \"model\": \"claude-sonnet-4-5-20250929\",
    \"max_tokens\": 4096,
    \"container\": {
      \"skills\": [
        {
          \"type\": \"anthropic\",
          \"skill_id\": \"xlsx\",
          \"version\": \"latest\"
        },
        {
          \"type\": \"custom\",
          \"skill_id\": \"$DCF_SKILL_ID\",
          \"version\": \"latest\"
        }
      ]
    },
    \"messages\": [{
      \"role\": \"user\",
      \"content\": \"Build a DCF valuation model for a SaaS company with the attached financials\"
    }],
    \"tools\": [{
      \"type\": \"code_execution_20250825\",
      \"name\": \"code_execution\"
    }]
  }"

Limits and Constraints

Request Limits

Maximum Skills per request: 8
Maximum Skill upload size: 8MB (all files combined)
YAML frontmatter requirements:
- name: Maximum 64 characters, lowercase letters/numbers/hyphens only, no XML tags, no reserved words
- description: Maximum 1024 characters, non-empty, no XML tags

Environment Constraints

Skills run in the code execution container with these limitations:

No network access - Cannot make external API calls
No runtime package installation - Only pre-installed packages available
Isolated environment - Each request gets a fresh container

See the code execution tool documentation for available packages.

Best Practices

When to Use Multiple Skills

Combine Skills when tasks involve multiple document types or domains: Good use cases:

Data analysis (Excel) + presentation creation (PowerPoint)
Report generation (Word) + export to PDF
Custom domain logic + document generation

Avoid:

Including unused Skills (impacts performance)

Version Management Strategy

For production:

# Pin to specific versions for stability
container={
    "skills": [{
        "type": "custom",
        "skill_id": "skill_01AbCdEfGhIjKlMnOpQrStUv",
        "version": "1759178010641129"  # Specific version
    }]
}

For development:

# Use latest for active development
container={
    "skills": [{
        "type": "custom",
        "skill_id": "skill_01AbCdEfGhIjKlMnOpQrStUv",
        "version": "latest"  # Always get newest
    }]
}

Prompt Caching Considerations

When using prompt caching, note that changing the Skills list in your container will break the cache:

# First request creates cache
response1 = client.beta.messages.create(
    model="claude-sonnet-4-5-20250929",
    max_tokens=4096,
    betas=["code-execution-2025-08-25", "skills-2025-10-02", "prompt-caching-2024-07-31"],
    container={
        "skills": [
            {"type": "anthropic", "skill_id": "xlsx", "version": "latest"}
        ]
    },
    messages=[{"role": "user", "content": "Analyze sales data"}],
    tools=[{"type": "code_execution_20250825", "name": "code_execution"}]
)

# Adding/removing Skills breaks cache
response2 = client.beta.messages.create(
    model="claude-sonnet-4-5-20250929",
    max_tokens=4096,
    betas=["code-execution-2025-08-25", "skills-2025-10-02", "prompt-caching-2024-07-31"],
    container={
        "skills": [
            {"type": "anthropic", "skill_id": "xlsx", "version": "latest"},
            {"type": "anthropic", "skill_id": "pptx", "version": "latest"}  # Cache miss
        ]
    },
    messages=[{"role": "user", "content": "Create a presentation"}],
    tools=[{"type": "code_execution_20250825", "name": "code_execution"}]
)

// First request creates cache
const response1 = await client.beta.messages.create({
  model: 'claude-sonnet-4-5-20250929',
  max_tokens: 4096,
  betas: ['code-execution-2025-08-25', 'skills-2025-10-02', 'prompt-caching-2024-07-31'],
  container: {
    skills: [
      {type: 'anthropic', skill_id: 'xlsx', version: 'latest'}
    ]
  },
  messages: [{role: 'user', content: 'Analyze sales data'}],
  tools: [{type: 'code_execution_20250825', name: 'code_execution'}]
});

// Adding/removing Skills breaks cache
const response2 = await client.beta.messages.create({
  model: 'claude-sonnet-4-5-20250929',
  max_tokens: 4096,
  betas: ['code-execution-2025-08-25', 'skills-2025-10-02', 'prompt-caching-2024-07-31'],
  container: {
    skills: [
      {type: 'anthropic', skill_id: 'xlsx', version: 'latest'},
      {type: 'anthropic', skill_id: 'pptx', version: 'latest'}  // Cache miss
    ]
  },
  messages: [{role: 'user', content: 'Create a presentation'}],
  tools: [{type: 'code_execution_20250825', name: 'code_execution'}]
});

# First request creates cache
curl https://api.anthropic.com/v1/messages \
  -H "x-api-key: $ANTHROPIC_API_KEY" \
  -H "anthropic-version: 2023-06-01" \
  -H "anthropic-beta: code-execution-2025-08-25,skills-2025-10-02,prompt-caching-2024-07-31" \
  -H "content-type: application/json" \
  -d '{
    "model": "claude-sonnet-4-5-20250929",
    "max_tokens": 4096,
    "container": {
      "skills": [
        {"type": "anthropic", "skill_id": "xlsx", "version": "latest"}
      ]
    },
    "messages": [{"role": "user", "content": "Analyze sales data"}],
    "tools": [{"type": "code_execution_20250825", "name": "code_execution"}]
  }'

# Adding/removing Skills breaks cache
curl https://api.anthropic.com/v1/messages \
  -H "x-api-key: $ANTHROPIC_API_KEY" \
  -H "anthropic-version: 2023-06-01" \
  -H "anthropic-beta: code-execution-2025-08-25,skills-2025-10-02,prompt-caching-2024-07-31" \
  -H "content-type: application/json" \
  -d '{
    "model": "claude-sonnet-4-5-20250929",
    "max_tokens": 4096,
    "container": {
      "skills": [
        {"type": "anthropic", "skill_id": "xlsx", "version": "latest"},
        {"type": "anthropic", "skill_id": "pptx", "version": "latest"}
      ]
    },
    "messages": [{"role": "user", "content": "Create a presentation"}],
    "tools": [{"type": "code_execution_20250825", "name": "code_execution"}]
  }'

For best caching performance, keep your Skills list consistent across requests.

Error Handling

Handle Skill-related errors gracefully:

try:
    response = client.beta.messages.create(
        model="claude-sonnet-4-5-20250929",
        max_tokens=4096,
        betas=["code-execution-2025-08-25", "skills-2025-10-02"],
        container={
            "skills": [
                {"type": "custom", "skill_id": "skill_01AbCdEfGhIjKlMnOpQrStUv", "version": "latest"}
            ]
        },
        messages=[{"role": "user", "content": "Process data"}],
        tools=[{"type": "code_execution_20250825", "name": "code_execution"}]
    )
except anthropic.BadRequestError as e:
    if "skill" in str(e):
        print(f"Skill error: {e}")
        # Handle skill-specific errors
    else:
        raise

try {
  const response = await client.beta.messages.create({
    model: 'claude-sonnet-4-5-20250929',
    max_tokens: 4096,
    betas: ['code-execution-2025-08-25', 'skills-2025-10-02'],
    container: {
      skills: [
        {type: 'custom', skill_id: 'skill_01AbCdEfGhIjKlMnOpQrStUv', version: 'latest'}
      ]
    },
    messages: [{role: 'user', content: 'Process data'}],
    tools: [{type: 'code_execution_20250825', name: 'code_execution'}]
  });
} catch (error) {
  if (error instanceof Anthropic.BadRequestError && error.message.includes('skill')) {
    console.error(`Skill error: ${error.message}`);
    // Handle skill-specific errors
  } else {
    throw error;
  }
}

Next Steps

API Reference

Complete API reference with all endpoints

Authoring Guide

Best practices for writing effective Skills

Code Execution Tool

Learn about the code execution environment

Product Guide

Account

Help

Using skills with the api

Using Agent Skills with the API

Quick Links

Get started with Agent Skills

Create Custom Skills

Overview

Using Skills

Prerequisites

Using Skills in Messages

Container Parameter

Downloading Generated Files

Multi-Turn Conversations

Long-Running Operations

Using Multiple Skills

Managing Custom Skills

Creating a Skill

Listing Skills

Retrieving a Skill

Deleting a Skill

Versioning

How Skills Are Loaded

Use Cases

Organizational Skills

Personal Skills

Example: Financial Modeling

Limits and Constraints

Request Limits

Environment Constraints

Best Practices

When to Use Multiple Skills

Version Management Strategy

Prompt Caching Considerations

Error Handling

Next Steps

API Reference

Authoring Guide

Code Execution Tool

​Using Agent Skills with the API

​Quick Links

Get started with Agent Skills

Create Custom Skills

​Overview

​Using Skills

​Prerequisites

​Using Skills in Messages

​Container Parameter

​Downloading Generated Files

​Multi-Turn Conversations

​Long-Running Operations

​Using Multiple Skills

​Managing Custom Skills

​Creating a Skill

​Listing Skills

​Retrieving a Skill

​Deleting a Skill

​Versioning

​How Skills Are Loaded

​Use Cases

​Organizational Skills

​Personal Skills

​Example: Financial Modeling

​Limits and Constraints

​Request Limits

​Environment Constraints

​Best Practices

​When to Use Multiple Skills

​Version Management Strategy

​Prompt Caching Considerations

​Error Handling

​Next Steps

API Reference

Authoring Guide

Code Execution Tool

Using Agent Skills with the API

Quick Links

Overview

Using Skills

Prerequisites

Using Skills in Messages

Container Parameter

Downloading Generated Files

Multi-Turn Conversations

Long-Running Operations

Using Multiple Skills

Managing Custom Skills

Creating a Skill

Listing Skills

Retrieving a Skill

Deleting a Skill

Versioning

How Skills Are Loaded

Use Cases

Organizational Skills

Personal Skills

Example: Financial Modeling

Limits and Constraints

Request Limits

Environment Constraints

Best Practices

When to Use Multiple Skills

Version Management Strategy

Prompt Caching Considerations

Error Handling

Next Steps