Adds a lifecycle hook to .claude/settings.json. Hooks run shell commands in response to Claude Code events — format code after writes, lint changes, block dangerous commands, etc. Supported events: • PreToolCall: Before a tool executes (use to block or validate) • PostToolCall: After a tool execu...
Risk signalsAccepts freeform code/query input (command)
Part of the Ccboot server.
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AI agents use ccboot_create_hook to create or modify resources in Ccboot. 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 ccboot_create_hook 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 Ccboot.
Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.
{
"version": "1",
"default": "deny",
"tools": {
"ccboot_create_hook": {
"limits": [
{
"counter": "ccboot_create_hook_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}See the full Ccboot policy for all 16 tools.
These attack patterns abuse exactly the kind of access ccboot_create_hook 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.
Adds a lifecycle hook to .claude/settings.json. Hooks run shell commands in response to Claude Code events — format code after writes, lint changes, block dangerous commands, etc. Supported events: • PreToolCall: Before a tool executes (use to block or validate) • PostToolCall: After a tool executes (use to format, lint, test) • Notification: On status notifications • Stop: When Claude stops generating • SubagentStop: When a subagent stops • PreCompact: Before context compaction • PostCompact: After context compaction • SessionStart: When a new session begins Environment variables available: $TOOL_INPUT_COMMAND, $TOOL_INPUT_FILE_PATH, etc. Examples: ccboot_create_hook({ event: "PostToolCall", matcher: "Write|Edit", command: 'npx prettier --write "$TOOL_INPUT_FILE_PATH"', exit_behavior: "notify", description: "Format on write" }) ccboot_create_hook({ event: "PreToolCall", matcher: "Bash", command: 'echo "$TOOL_INPUT_COMMAND" | grep -qE "rm -rf|DROP TABLE" && exit 1', exit_behavior: "block", description: "Block dangerous commands" }) Returns: Hook details, updated settings path. Idempotent: Re-running with same command+matcher updates the existing hook.. It is categorised as a Write tool in the Ccboot MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Ccboot MCP server in PolicyLayer and add a rule for ccboot_create_hook: 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 Ccboot. Nothing to install.
ccboot_create_hook 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 ccboot_create_hook 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 ccboot_create_hook. 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.
ccboot_create_hook is provided by the Ccboot MCP server (ccboot-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 16 Ccboot tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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