MCP Tool Reference Medium Risk

upload_asset

Upload new assets

Part of the Contentful MCP server. Enforce policies on this tool with Intercept, the open-source MCP proxy.

@contentful/mcp-server Write

WHEN AI AGENTS USE THIS TOOL

AI agents use upload_asset to create or modify resources in Contentful. Write operations carry medium risk because an autonomous agent could trigger bulk unintended modifications. Rate limits prevent a single agent session from making hundreds of changes in rapid succession. Argument validation ensures the agent passes expected values.

WHY ENFORCE A POLICY ON UPLOAD_ASSET

Without a policy, an AI agent could call upload_asset repeatedly, creating or modifying resources faster than any human could review. Intercept's rate limiting ensures write operations happen at a controlled pace, and argument validation catches malformed or unexpected inputs before they reach Contentful.

RECOMMENDED POLICY

Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.

contentful.yaml 
tools:
  upload_asset:
    rules:
      - action: allow
        rate_limit:
          max: 30
          window: 60

See the full Contentful policy for all 61 tools.

DETAILS

Tool Name

upload_asset

Category

Write

MCP Server

Contentful MCP Server

Risk Level

Medium

MORE CONTENTFUL TOOLS

create_content_type Write
Create new content types
update_content_type Write
Modify existing content types
unpublish_content_type Write
Unpublish content types
create_entry Write
Create new content entries with locale support
update_entry Write
Modify existing entries with locale support
unpublish_entry Write
Unpublish entries
update_editor_interface Write
Update field controls, sidebars, and layouts
update_asset Write
Modify asset metadata

View all 61 tools →

SIMILAR WRITE TOOLS ON OTHER SERVERS

create_table Airtable
Create a new table with fields
update_table Airtable
Update a table's name or description
create_field Airtable
Add a new field to a table
update_field Airtable
Modify an existing field
create_record Airtable
Add a new record
update_record Airtable
Modify an existing record

RELATED READING

FREQUENTLY ASKED QUESTIONS

What does the upload_asset tool do?

Upload new assets. It is categorised as a Write tool in the Contentful MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on upload_asset?

Add a rule in your Intercept YAML policy under the tools section for upload_asset. You can allow, deny, rate-limit, or validate arguments. Then run Intercept as a proxy in front of the Contentful MCP server.

What risk level is upload_asset?

upload_asset is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit upload_asset?

Yes. Add a rate_limit block to the upload_asset rule in your Intercept policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block upload_asset completely?

Set action: deny in the Intercept policy for upload_asset. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides upload_asset?

upload_asset is provided by the Contentful MCP server (@contentful/mcp-server). Intercept sits as a proxy in front of this server to enforce policies before tool calls reach the server.

ENFORCE POLICIES ON CONTENTFUL

Open source. One binary. Zero dependencies.

VIEW ON GITHUB Full Contentful policy →