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-- subagents/luatool.lua: sandboxing plus the session-scoped asynchronous
-- workflow API exposed to model-authored Lua.
local fake = require("spec.fake_ext")
local jobs = require("subagents.jobs")
local luatool = require("subagents.luatool")
local workflow = require("subagents.workflow")
local uv = require("luv")
local function has(text, needle)
assert(type(text) == "string", "expected a string, got " .. type(text))
assert(text:find(needle, 1, true), "expected to find " .. needle .. " in:\n" .. tostring(text))
end
local function profile_set()
local set = { list = {}, by_name = {}, warnings = {} }
for _, name in ipairs({ "alpha", "beta" }) do
local profile = { name = name, description = name, body = "You are " .. name .. ".\n" }
set.list[#set.list + 1] = profile
set.by_name[name] = profile
end
return set
end
local function pump(id)
for _ = 1, 2000 do
uv.run("nowait")
local record = workflow.workflows[id]
if record and record.status ~= "running" then return record end
uv.sleep(1)
end
error("workflow did not settle: " .. tostring(id), 0)
end
local function with_host(fn)
local handle = fake.install()
local ok, err = pcall(fn, handle, profile_set())
pcall(jobs.close_all)
handle.restore()
if not ok then error(err, 0) end
end
return {
{ "the guest environment has no filesystem, process, or module access", function()
local env = luatool.build_env()
for _, name in ipairs({
"os", "io", "debug", "package", "require", "load", "loadstring", "dofile",
"loadfile", "coroutine", "setmetatable", "getmetatable", "rawset", "rawget",
"collectgarbage", "arg", "pcall", "xpcall",
}) do
assert(env[name] == nil, "the guest can reach " .. name)
end
assert(env._G == env)
assert(type(env.subagents.workflow) == "function")
assert(type(env.subagents.workflows) == "table")
assert(env.string.dump == nil and env.string ~= string)
assert(env.print() == nil)
end },
{ "the string metatable stays reachable and harmless", function()
local env = luatool.build_env()
assert(type(("").dump) == "function")
assert(env.load == nil and env.loadstring == nil)
end },
{ "source is required and ordinary source values return directly", function()
with_host(function(_, profiles)
assert(luatool.handle({ source = "return 42" }, profiles) == "42")
has(luatool.handle({}, profiles), "Error: source is required")
has(luatool.handle({ source = "return (" }, profiles), "Error: source did not compile")
has(luatool.handle({ source = "error('nope')" }, profiles), "Error: source failed to run")
end)
end },
{ "a workflow returns an id immediately then records named results", function()
with_host(function(handle, profiles)
handle.queue_for("alpha", { id = "0198-a", output = "alpha output" })
handle.queue_for("beta", { id = "0198-b", output = "beta output" })
local id = luatool.handle({ source = [[
return subagents.workflow(function(ctx)
local a = ctx:agent{name="research", agent="alpha", prompt="research"}
local b = ctx:agent{name="review", agent="beta", prompt="review"}
local results = ctx:await({a, b}, "all")
return results[1].output .. " + " .. results[2].output
end)
]] }, profiles, { tool_call_id = "lua-call" })
has(id, "workflow-")
assert(workflow.workflows[id].status == "running")
assert(#handle.spawns == 0, "the callback starts after the tool returns")
local record = pump(id)
assert(record.status == "completed", tostring(record.error))
assert(record.result == "alpha output + beta output", tostring(record.result))
assert(#record.agents == 2)
assert(record.agents.research.output == "alpha output")
assert(record.agents[2].name == "review")
assert(record.agents.review.status == "completed")
assert(#handle.submissions == 1, "completion wakes the primary once")
has(handle.submissions[1], id)
assert(handle.emitted[1] == "agent_submission", "the host pipeline is explicitly woken")
end)
end },
{ "a later Lua call inspects workflows and records are read-only", function()
with_host(function(_, profiles)
local id = luatool.handle({ source = [[
return subagents.workflow(function(ctx) return "done" end)
]] }, profiles)
pump(id)
local query = string.format(
"local w=subagents.workflows[%q]; return w.status .. '|' .. w.result", id)
assert(luatool.handle({ source = query }, profiles) == "completed|done")
local mutation = string.format(
"subagents.workflows[%q].status='forged'; return 'bad'", id)
has(luatool.handle({ source = mutation }, profiles), "read-only")
assert(workflow.workflows[id].status == "completed")
end)
end },
{ "completed agent output is inspectable while its workflow still runs", function()
with_host(function(handle, profiles)
handle.queue_for("alpha", { output = "early" })
handle.queue_for("beta", { output = "late", settle = 100000 })
local id = luatool.handle({ source = [[
return subagents.workflow(function(ctx)
local first = ctx:agent{name="first", agent="alpha", prompt="first"}:await()
local second = ctx:agent{name="second", agent="beta", prompt="second"}:await()
return first.output .. second.output
end)
]] }, profiles)
for _ = 1, 100 do
uv.run("nowait")
local w = workflow.workflows[id]
if w.agents.first and w.agents.first.status == "completed" and w.agents.second then break end
end
local w = workflow.workflows[id]
assert(w.status == "running")
assert(w.agents.first.output == "early")
assert(w.agents.second.status == "running")
local query = string.format(
"local w=subagents.workflows[%q]; return w.agents.first.output .. '|' .. w.status", id)
assert(luatool.handle({ source = query }, profiles) == "early|running")
local iterated = {}
for name, agent in pairs(w.agents) do iterated[#iterated + 1] = name .. ":" .. agent.status end
assert(iterated[1] == "first:completed" and iterated[2] == "second:running")
workflow.cancel_all(true)
jobs.cancel_all()
pump(id)
end)
end },
{ "agent names are required and unique within a workflow", function()
with_host(function(handle, profiles)
local id = luatool.handle({ source = [[
return subagents.workflow(function(ctx)
ctx:agent{name="same", agent="alpha", prompt="one"}
ctx:agent{name="same", agent="beta", prompt="two"}
return "unreachable"
end)
]] }, profiles)
local record = pump(id)
assert(record.status == "failed")
has(record.error, "duplicate workflow agent name 'same'")
assert(#handle.spawns == 1, "the duplicate is rejected before spawning")
local missing = luatool.handle({ source = [[
return subagents.workflow(function(ctx)
ctx:agent{agent="alpha", prompt="one"}
return "unreachable"
end)
]] }, profiles)
has(pump(missing).error, "requires a non-empty unique `name`")
end)
end },
{ "callback errors and non-string returns fail the workflow", function()
with_host(function(_, profiles)
local bad_type = luatool.handle({ source = [[
return subagents.workflow(function(ctx) return {"no"} end)
]] }, profiles)
local record = pump(bad_type)
assert(record.status == "failed")
has(record.error, "must return a string")
local raised = luatool.handle({ source = [[
return subagents.workflow(function(ctx) error("boom") end)
]] }, profiles)
has(pump(raised).error, "boom")
end)
end },
{ "inline profiles are scoped to workflows started by one call", function()
with_host(function(handle, profiles)
handle.queue_for("local", { output = "local output" })
local source = [[
return subagents.workflow(function(ctx)
local result = ctx:agent{name="work", agent="local", prompt="inspect"}:await()
return result.output
end)
]]
local id = luatool.handle({
source = source,
agents = { { name = "local", system_prompt = "Be local." } },
}, profiles)
assert(pump(id).result == "local output")
assert(handle.spawns[1].system_messages[2].text == "Be local.")
local missing = luatool.handle({ source = source }, profiles)
has(pump(missing).error, "unknown agent 'local'")
assert(#handle.spawns == 1)
end)
end },
{ "the instruction and job budgets apply to background workflows", function()
with_host(function(handle, profiles)
local runaway = luatool.handle({ source = [[
return subagents.workflow(function(ctx)
local n=0; while true do n=n+1 end
end)
]] }, profiles)
has(pump(runaway).error, "instruction budget exceeded")
local source = string.format([[
return subagents.workflow(function(ctx)
for index=1,%d do
ctx:agent{name="job-"..index, agent="alpha", prompt="spam"}
end
return "unreachable"
end)
]], luatool.max_jobs + 1)
local capped = luatool.handle({ source = source }, profiles)
has(pump(capped).error, "job limit exceeded")
assert(#handle.runs == luatool.max_jobs)
end)
end },
}
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