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",[514,520,522],{"href":521},"\u002Fconcepts\u002Fvocabulary#worker","worker"," reaches Kraft through a channel of its own. This page covers the shim it calls, how each harness's permission check travels, and what changes without ",[525,526,527],"code",{},"network:",".",[530,531,533,534,537],"h2",{"id":532},"the-kraft-shim","The ",[525,535,536],{},"kraft"," shim",[510,539,540,541,544,545,547,548,551,552,555,556,559,560,563,564,566],{},"Under a ",[514,542,543],{"href":353},"network policy"," a sandboxed worker reaches Kraft through its session's own channel, the one its proxy runs on. Every such container has Kraft's ",[525,546,536],{}," shim, a ",[525,549,550],{},"sh"," and ",[525,553,554],{},"curl"," script, mounted read-only at ",[525,557,558],{},"\u002Fopt\u002Fkraft\u002Fbin"," and first on its ",[525,561,562],{},"PATH"," (the image's own ",[525,565,562],{}," after it).",[510,568,569],{},"The shim has only the verbs a worker needs, each for the worker's own item only:",[571,572,573,579,584,598,603,608],"ul",{},[574,575,576],"li",{},[525,577,578],{},"kraft item progress K",[574,580,581],{},[525,582,583],{},"kraft item reply THREAD --body ...",[574,585,586,589,590,594,595],{},[525,587,588],{},"kraft item retry",": an ",[514,591,593],{"href":592},"\u002Fconcepts\u002Fvocabulary#escalation-turn","escalation turn"," may retry its item, and a worker's own retry is answered ",[525,596,597],{},"403",[574,599,600],{},[525,601,602],{},"kraft view show|threads",[574,604,605],{},[525,606,607],{},"kraft view events [--after N] [--type T]",[574,609,610],{},[525,611,612],{},"kraft admin permission-hook HARNESS",[510,614,615,618,619,551,622,625,626,629],{},[525,616,617],{},"view events"," answers the item's history as JSON (all of it, or the part ",[525,620,621],{},"--after",[525,623,624],{},"--type"," keep). The history holds what a person wrote in a steer or a gate note, and every permission decision. There is no ",[525,627,628],{},"-f"," inside.",[510,631,632,633,636,637,640,641,645,646,649],{},"There is no ",[525,634,635],{},"kraft view diff"," or ",[525,638,639],{},"compare"," inside: Kraft reads no git in a ",[514,642,644],{"href":643},"\u002Fconcepts\u002Fvocabulary#worktree","worktree"," while a sandboxed session runs in it, and the worker has ",[525,647,648],{},"git"," itself.",[510,651,652,653,656],{},"The shim sends each call to ",[525,654,655],{},"http:\u002F\u002Fkraft"," through the proxy, which answers it in the Kraft server itself, never forwarded anywhere.",[510,658,659,660,664],{},"A call acts as the session whose channel it came in on, whatever headers or token the worker sends. It acts only on that session's own ",[514,661,663],{"href":662},"\u002Fconcepts\u002Fvocabulary#work-item","work item",": its progress, replies on its own item's threads, its own permission asks, and reads of its own item. An escalation turn may also retry that item.",[510,666,667,668,670,671,674,675,678,679,681],{},"A call to anything else is answered ",[525,669,597],{}," and recorded as a ",[525,672,673],{},"sandbox_egress_refused"," event, like a refused host. A worker's own ",[525,676,677],{},"retry"," of its item passes the channel, and the API refuses it with ",[525,680,597],{}," (\"a worker session cannot act on its own work item\"); no event is recorded for that one. No allow list entry is needed for any of this.",[530,683,685,686],{"id":684},"permission-checks-under-network","Permission checks under ",[525,687,527],{},[571,689,690,716,730],{},[574,691,692,696,697,700,701],{},[693,694,695],"strong",{},"Codex."," Its hook is the shim's ",[525,698,699],{},"admin permission-hook codex",".\n",[571,702,703,710,713],{},[574,704,705,706,709],{},"The hash Codex needs to trust the hook is asked of the image's own ",[525,707,708],{},"codex",", in a short container with no network, since Codex silently skips a hook it does not trust and runs the call.",[574,711,712],{},"When that cannot be done (the image's Codex does not start, or does not trust the hook), the task is refused.",[574,714,715],{},"When the shim gets no answer from Kraft, it prints Codex's own deny.",[574,717,718,721,722,725,726,729],{},[693,719,720],{},"Claude."," Launched with Kraft's MCP server at ",[525,723,724],{},"http:\u002F\u002Fkraft\u002Fmcp"," and no other (",[525,727,728],{},"--strict-mcp-config","), which answers its permission tool for that session alone.",[574,731,732,735],{},[693,733,734],{},"Cursor"," ignores a proxy, so it is refused under a network policy.",[530,737,739,740],{"id":738},"without-network","Without ",[525,741,527],{},[510,743,744,745,747,748,528],{},"Kraft sets up no channel to itself: the container has no ",[525,746,536],{}," command and no Kraft MCP server. Kraft does not restrict the container's network either, so do not rely on this configuration to keep a worker away from the host: see ",[514,749,477],{"href":478},[510,751,752,753,755,756,759,760,528],{},"For that reason every launch into a sandbox without ",[525,754,527],{}," is refused, whatever the harness, unless the sandbox sets ",[525,757,758],{},"unrestricted_network: true",". That key says you accept an unrestricted network and gates that are not enforced; it cannot be set together with ",[525,761,527],{},[510,763,764,765,768,769,772,773,776],{},"With it, a sandboxed Claude task is still refused before it starts (its permission tool would be missing and the CLI would exit), as is a Codex or Cursor task with a tool policy (",[525,766,767],{},"allowed_tools",", ",[525,770,771],{},"deny_tools"," or a grant other than ",[525,774,775],{},"git-commit","). For a task that does start:",[571,778,779,785,800],{},[574,780,781,782,784],{},"Prompts do not tell the worker to run ",[525,783,536],{},": it tags its commits with the task number instead of reporting progress, and says what it did about each review thread in its result.",[574,786,787,788,791,792,795,796,799],{},"No reply agent is launched for review threads: a ",[525,789,790],{},"comment"," review answers ",[525,793,794],{},"reply_agent: false",", and the item records a ",[525,797,798],{},"reply_agent_skipped"," event saying why.",[574,801,802],{},"An escalation turn cannot resume the chain itself: you retry it.",[530,804,806],{"id":805},"related","Related",[571,808,809,814,819],{},[574,810,811,813],{},[514,812,352],{"href":353},": the channel the callbacks travel on.",[574,815,816,818],{},[514,817,338],{"href":339},": what else reaches the container.",[574,820,821,823],{},[514,822,344],{"href":345},": the CPU, memory and process limits of a sandbox's container.",{"title":825,"searchDepth":826,"depth":826,"links":827},"",2,[828,830,832,834],{"id":532,"depth":826,"text":829},"The kraft shim",{"id":684,"depth":826,"text":831},"Permission checks under network:",{"id":738,"depth":826,"text":833},"Without network:",{"id":805,"depth":826,"text":806},"How a sandboxed worker reaches Kraft through a network policy's channel, which verbs it has there, and what is refused without one.","md",null,{},true,{"title":348,"description":835},"RzeUvu5bNXUqbge4hkJosz9NO55BNSPcnAZ2zmmOw90",[843,845],{"title":344,"path":345,"stem":346,"description":844,"children":-1},"The CPU, memory and process limits a sandbox sets on its container, when a limit cannot be enforced, and what Kraft does when a memory limit kills a process.",{"title":352,"path":353,"stem":354,"description":846,"children":-1},"How the hosts a sandboxed task may reach are listed, how Kraft enforces them, and what the policy does not cover.",1791801242192]