eve
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Filesystem-first framework for durable backend AI agents that run anywhere.
3 lines (2 loc) • 4.88 kB
JavaScript
import{validateHarnessModelMessages}from"#harness/messages.js";import{formatAvailableSkillsSection}from"#execution/skills/instructions.js";const DEFAULT_ROOT_MAX_INPUT_TOKENS_PER_SESSION=4e7;function createCompactionConfig(e={}){let t=e.thresholdPercent??.9,n={recentWindowSize:10,threshold:e.contextWindowTokens===void 0?1e5:Math.max(1,Math.floor(e.contextWindowTokens*t)),thresholdPercent:t};return e.lastKnownInputTokens===void 0?n:{...n,lastKnownInputTokens:e.lastKnownInputTokens,lastKnownPromptMessageCount:e.lastKnownPromptMessageCount}}function createSession(e){let{turnAgent:t}=e,n=createSessionToolDefinitions(t),r={agent:createSessionAgent(t,createSessionSystemPrompt(t),n),compaction:createCompactionConfig({contextWindowTokens:t.model?.contextWindowTokens,thresholdPercent:e.compactionOverrides?.thresholdPercent}),continuationToken:e.continuationToken,history:[...t.initialMessages??[]],sessionId:e.sessionId};return e.rootSessionId!==void 0&&(r.rootSessionId=e.rootSessionId),r.limits=resolveSessionLimits(e),e.outputSchema!==void 0&&(r.outputSchema=e.outputSchema),e.taskId!==void 0&&(r.taskId=e.taskId),e.workflowMaxSubagents!==void 0&&(r.workflowMaxSubagents=e.workflowMaxSubagents),r}function createSessionAgent(e,t,n){let r={compactionModelReference:e.compactionModel,reasoning:e.reasoning,system:t,tools:n};if(e.model!==void 0)return{...r,modelReference:e.model};if(e.dynamicModel!==void 0)return{...r,dynamicModel:!0};throw Error(`Cannot create a session before dynamic subagent config is selected.`)}function refreshSessionFromTurnAgent(e){return{...e.session,agent:createSessionAgent(e.turnAgent,createSessionSystemPrompt(e.turnAgent),createSessionToolDefinitions(e.turnAgent)),compaction:createCompactionConfig({contextWindowTokens:e.turnAgent.model?.contextWindowTokens,lastKnownInputTokens:e.session.compaction.lastKnownInputTokens,lastKnownPromptMessageCount:e.session.compaction.lastKnownPromptMessageCount,thresholdPercent:e.compactionOverrides?.thresholdPercent})}}function createSessionSystemPrompt(e){let t=formatAvailableSkillsSection(e.availableSkills??[]);return(t===null?e.instructions:[...e.instructions,t]).join(`
`)}function mintSubagentContinuationToken(e){return`subagent:${e??crypto.randomUUID()}`}function projectToDurableSession(e){let t={agent:{system:e.agent.system},continuationToken:e.continuationToken,history:e.history,sessionId:e.sessionId};return(e.compaction.lastKnownInputTokens!==void 0||e.compaction.lastKnownPromptMessageCount!==void 0)&&(t.compaction={lastKnownInputTokens:e.compaction.lastKnownInputTokens,lastKnownPromptMessageCount:e.compaction.lastKnownPromptMessageCount}),e.rootSessionId!==void 0&&(t.rootSessionId=e.rootSessionId),e.limits!==void 0&&(t.limits=e.limits),e.outputSchema!==void 0&&(t.outputSchema=e.outputSchema),e.sandboxState!==void 0&&(t.sandboxState=e.sandboxState),e.state!==void 0&&(t.state=e.state),e.taskId!==void 0&&(t.taskId=e.taskId),e.workflowMaxSubagents!==void 0&&(t.workflowMaxSubagents=e.workflowMaxSubagents),t}function hydrateDurableSession(e){let{durable:t,turnAgent:n}=e,r=createSessionToolDefinitions(n),i={agent:createSessionAgent(n,t.agent.system,r),compaction:createCompactionConfig({contextWindowTokens:n.model?.contextWindowTokens,lastKnownInputTokens:t.compaction?.lastKnownInputTokens,lastKnownPromptMessageCount:t.compaction?.lastKnownPromptMessageCount,thresholdPercent:e.compactionOverrides?.thresholdPercent}),continuationToken:t.continuationToken,history:validateHarnessModelMessages(t.history),sessionId:t.sessionId};return t.rootSessionId!==void 0&&(i.rootSessionId=t.rootSessionId),t.limits!==void 0&&(i.limits=t.limits),t.outputSchema!==void 0&&(i.outputSchema=t.outputSchema),t.sandboxState!==void 0&&(i.sandboxState=t.sandboxState),t.state!==void 0&&(i.state=t.state),t.taskId!==void 0&&(i.taskId=t.taskId),t.workflowMaxSubagents!==void 0&&(i.workflowMaxSubagents=t.workflowMaxSubagents),i}function createSessionToolDefinitions(e){return e.tools.map(e=>({description:e.description??``,inputSchema:e.inputSchema,name:e.name,outputSchema:e.outputSchema}))}function resolveSessionLimits(e){let t=e.rootSessionId!==void 0,n=resolveSessionTokenLimit({authored:e.limits?.maxInputTokensPerSession,fallback:t?void 0:DEFAULT_ROOT_MAX_INPUT_TOKENS_PER_SESSION}),r=resolveSessionTokenLimit({authored:e.limits?.maxOutputTokensPerSession,fallback:void 0}),i=resolveSessionTokenLimit({authored:e.limits?.maxTokenCostUsdPerSession,fallback:void 0}),a={};return n!==void 0&&(a.maxInputTokensPerSession=n),r!==void 0&&(a.maxOutputTokensPerSession=r),i!==void 0&&(a.maxTokenCostUsdPerSession=i),a}function resolveSessionTokenLimit(e){return e.authored===!1?void 0:e.authored??e.fallback}export{DEFAULT_ROOT_MAX_INPUT_TOKENS_PER_SESSION,createCompactionConfig,createSession,hydrateDurableSession,mintSubagentContinuationToken,projectToDurableSession,refreshSessionFromTurnAgent};