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eve

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Filesystem-first framework for durable backend AI agents that run anywhere.

github.com/vercel/eve

vercel/eve

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import{isUserMessageKind}from"#harness/messages.js";const CONTENT_ATTRIBUTE_LIMIT=32768;function contentAttribute(e){if(e===void 0)return;let t;try{t=JSON.stringify(e)}catch{return}if(t!==void 0)return textContentAttribute(t)}function genAiInputMessagesAttribute(e){if(!Array.isArray(e))return;let t=e.flatMap(e=>{if(!isRecord(e)||e.role===`system`||typeof e.role!=`string`)return[];let t=semanticParts(e.content);if(t.length===0)return[];let n=e.role===`user`&&isUserMessageKind(e.kind)?e.kind:void 0;return[n===void 0?{parts:t,role:e.role}:{kind:n,parts:t,role:e.role}]});for(let e=0;e<t.length;e+=1){let n=semanticJsonAttribute(t.slice(e));if(n!==void 0)return n}return truncateSingleSemanticMessage(t)??semanticJsonAttribute([])}function genAiSystemInstructionsAttribute(e){let t=systemPromptAttribute(e);return t===void 0?void 0:semanticJsonAttribute([{content:t,type:`text`}])}function genAiOutputMessagesAttribute(e,t){let n=semanticParts(e);return semanticJsonAttribute([{finish_reason:t===`tool-calls`?`tool_call`:t,parts:n,role:`assistant`}])}function genAiMemoryRecordsAttribute(e){return semanticJsonAttribute(e)}function toolResultsContentAttribute(e){if(e.length===0)return;let t=stringifyContent(e);if(t!==void 0&&t.length<=32768)return t;for(let t=CONTENT_ATTRIBUTE_LIMIT;t>=0;t=t>=256?Math.floor(t/2):-1){let n=stringifyContent(e.map(e=>cappedToolResult(e,t)));if(n!==void 0&&n.length<=32768)return n}}function cappedToolResult(e,t){let n={toolName:e.toolName};for(let r of[`input`,`output`,`error`]){if(!(r in e))continue;let i=e[r],a=typeof i==`string`?i:stringifyContent(i)??``;n[r]=a.length<=t?a:`${a.slice(0,t)}… [truncated]`}return n}function systemPromptAttribute(e){if(typeof e==`string`)return textContentAttribute(e);if(!isRecord(e)&&!Array.isArray(e))return;let t=Array.isArray(e)?e:[e],n=[];for(let e of t)if(isRecord(e)){if(typeof e.content==`string`)n.push(e.content);else if(Array.isArray(e.content))for(let t of e.content)isRecord(t)&&t.type===`text`&&typeof t.text==`string`&&n.push(t.text)}let r=n.join(` `).trim();return r.length===0?void 0:textContentAttribute(r)}function textContentAttribute(e){if(e.length!==0)return e.length<=32768?e:`${e.slice(0,CONTENT_ATTRIBUTE_LIMIT)}… [truncated]`}function stringifyContent(e){try{return JSON.stringify(e)}catch{return}}function semanticJsonAttribute(e){let t=stringifyContent(e);return t!==void 0&&t.length<=32768?t:void 0}function truncateSingleSemanticMessage(e){let t=e.at(-1);if(t===void 0||typeof t.role!=`string`)return;let n=semanticMessageText(t.parts),r=typeof t.kind==`string`?{kind:t.kind,role:t.role}:{role:t.role};for(let e=Math.min(n.length,CONTENT_ATTRIBUTE_LIMIT);e>0;e-=256){let t=semanticJsonAttribute([{...r,parts:[{content:`${n.slice(0,e)}… [truncated]`,type:`text`}]}]);if(t!==void 0)return t}return semanticJsonAttribute([{...r,parts:[{content:`… [truncated]`,type:`text`}]}])}function semanticMessageText(e){if(!Array.isArray(e))return``;let t=``;for(let n of e){if(!isRecord(n)||n.type!==`text`||typeof n.content!=`string`)continue;let e=t.length===0?``:` `,r=32769-t.length-e.length;if(r<=0)break;t+=e+n.content.slice(0,r)}return t}function semanticParts(e){if(typeof e==`string`)return[{content:e,type:`text`}];if(!Array.isArray(e))return[];let t=[];for(let n of e){let e=semanticPart(n);e!==void 0&&t.push(e)}return t}function semanticPart(e){if(isRecord(e)&&typeof e.type==`string`)switch(e.type){case`text`:case`reasoning`:{let t=typeof e.text==`string`?e.text:e.content;return typeof t==`string`?{content:t,type:e.type}:void 0}case`tool-call`:return{arguments:e.input,id:stringValue(e.toolCallId)??stringValue(e.callId)??null,name:e.toolName,type:`tool_call`};case`tool-result`:return{id:stringValue(e.toolCallId)??stringValue(e.callId)??null,response:toolResponse(e.output),type:`tool_call_response`};case`tool-error`:return{id:stringValue(e.toolCallId)??stringValue(e.callId)??null,response:e.error instanceof Error?e.error.message:e.error,type:`tool_call_response`};default:return{type:e.type}}}function toolResponse(e){return isRecord(e)?(e.type===`text`||e.type===`error-text`||e.type===`json`||e.type===`error-json`)&&`value`in e?e.value:e.type===`execution-denied`?{denied:!0,reason:e.reason}:e:e}function stringValue(e){return typeof e==`string`?e:void 0}function isRecord(e){return typeof e==`object`&&!!e&&!Array.isArray(e)}export{CONTENT_ATTRIBUTE_LIMIT,contentAttribute,genAiInputMessagesAttribute,genAiMemoryRecordsAttribute,genAiOutputMessagesAttribute,genAiSystemInstructionsAttribute,systemPromptAttribute,textContentAttribute,toolResultsContentAttribute};