Apply normalize operations. Two modes: "extract" writes agent-approved strings to Contentrain content files (source untouched), "reuse" patches source files with agent-provided replacement expressions. DRY RUN (default, dry_run:true): validates inputs, resolves conflicts, and returns a full previ...
Accepts file system path (extractions[].entries[].source.file); High parameter count (30 properties)
Part of the Contentrain MCP server. Enforce policies on this tool with Intercept, the open-source MCP proxy.
AI agents use contentrain_apply to create or modify resources in Contentrain. 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.
Without a policy, an AI agent could call contentrain_apply 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 Contentrain.
Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.
tools:
contentrain_apply:
rules:
- action: allow
rate_limit:
max: 30
window: 60See the full Contentrain policy for all 15 tools.
Agents calling write-class tools like contentrain_apply have been implicated in these attack patterns. Read the full case and prevention policy for each:
Other tools in the Write risk category across the catalogue. The same policy patterns (rate-limit, validate) apply to each.
Apply normalize operations. Two modes: "extract" writes agent-approved strings to Contentrain content files (source untouched), "reuse" patches source files with agent-provided replacement expressions. DRY RUN (default, dry_run:true): validates inputs, resolves conflicts, and returns a full preview — NO changes to disk or git. EXECUTE (dry_run:false): writes files to disk, commits to a branch, and requires branch health check to pass. Recommended workflow: always run dry_run first, review the preview, then call again with dry_run:false to execute. Normalize operations always use review workflow (never auto-merge).. It is categorised as a Write tool in the Contentrain MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Add a rule in your Intercept YAML policy under the tools section for contentrain_apply. You can allow, deny, rate-limit, or validate arguments. Then run Intercept as a proxy in front of the Contentrain MCP server.
contentrain_apply is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the contentrain_apply 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.
Set action: deny in the Intercept policy for contentrain_apply. 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.
contentrain_apply is provided by the Contentrain MCP server (@contentrain/mcp). Intercept sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Open source. One binary. Zero dependencies.
npx -y @policylayer/intercept