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My version of https://github.com/vercel-labs/fx
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Zig
123456789101112131415161718192021222324252627282930313233343536373839404142const std = @import("std");
const Allocator = std.mem.Allocator;
/// Classifies command-shaped tool calls that use captured execution rather/// than a durable terminal session. Historical `run_command` records remain/// presentation-compatible even though that tool is no longer executable.pub fn isToolCall( alloc: Allocator, tool_name: []const u8, arguments_json: []const u8,) Allocator.Error!bool { if (std.mem.eql(u8, tool_name, "run_command")) return true; if (!std.mem.eql(u8, tool_name, "terminal")) return false;
var parsed = std.json.parseFromSlice(std.json.Value, alloc, arguments_json, .{}) catch |err| switch (err) { error.OutOfMemory => return error.OutOfMemory, else => return false, }; defer parsed.deinit(); if (parsed.value != .object) return false; const action = parsed.value.object.get("action") orelse return false; return action == .string and std.mem.eql(u8, action.string, "exec");}
test "captured command classification recognizes terminal exec and historical records" { const alloc = std.testing.allocator; try std.testing.expect(try isToolCall( alloc, "terminal", "{\"action\":\"exec\",\"command\":\"printf ok\"}", )); try std.testing.expect(!try isToolCall( alloc, "terminal", "{\"action\":\"start\",\"command\":\"printf ok\"}", )); try std.testing.expect(try isToolCall(alloc, "run_command", "{}")); try std.testing.expect(!try isToolCall(alloc, "read_file", "{}")); try std.testing.expect(!try isToolCall(alloc, "terminal", "not-json"));}