Runs the TypeScript compiler and returns structured diagnostics (file, line, column, code, message). Note: In compact mode, diagnostics are trimmed to file, line, and code — column and message fields are omitted to save tokens.
Risk signalsAccepts file system path (path) · High parameter count (11 properties)
Part of the Build server.
Free to start. No card required.
AI agents use tsc to create or modify resources in Build. 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 tsc repeatedly, creating or modifying resources faster than any human could review. PolicyLayer's rate limiting ensures write operations happen at a controlled pace, and argument validation catches malformed or unexpected inputs before they reach Build.
Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.
{
"version": "1",
"default": "deny",
"tools": {
"tsc": {
"limits": [
{
"counter": "tsc_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}See the full Build policy for all 9 tools.
These attack patterns abuse exactly the kind of access tsc gives an agent. Each links to the full case and the policy that stops it:
Other write tools across the catalogue. The same approach applies to each: rate-limit and validate the arguments.
Runs the TypeScript compiler and returns structured diagnostics (file, line, column, code, message). Note: In compact mode, diagnostics are trimmed to file, line, and code — column and message fields are omitted to save tokens.. It is categorised as a Write tool in the Build MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Build MCP server in PolicyLayer and add a rule for tsc: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Build. Nothing to install.
tsc 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 tsc rule in your PolicyLayer 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 PolicyLayer policy for tsc. 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.
tsc is provided by the Build MCP server (@paretools/build). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 9 Build tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
4,600+ MCP servers and 31,000+ tools scanned and risk-classified.