Function formatMcpResourceContent

packages/opencode/src/session/tools.ts:526–569

(server: string, uri: string, content: { contents: unknown })

}

function formatMcpResourceContent(server: string, uri: string, content: { contents: unknown }) {
  const items = (Array.isArray(content.contents) ? content.contents : [content.contents]).filter(isRecord)
  const text: string[] = []
  const attachments: Omit<SessionV1.FilePart, "id" | "sessionID" | "messageID">[] = []

  for (const item of items) {
    const itemUri = typeof item.uri === "string" ? item.uri : uri
    const mime = typeof item.mimeType === "string" ? item.mimeType : "application/octet-stream"
    if (typeof item.text === "string") {
      text.push(`Resource: ${itemUri}\nMIME: ${mime}\n${item.text}`)
      continue
    }
    if (typeof item.blob === "string") {
      const size = base64Size(item.blob)
      if (!SUPPORTED_MCP_RESOURCE_ATTACHMENT_MIMES.has(mime)) {
        text.push(
          `[Binary MCP resource omitted: ${itemUri} (${mime}, ${formatBytes(size)}) is not a supported attachment type]`,
        )
        continue
      }
      if (size > MAX_MCP_RESOURCE_BLOB_BYTES) {
        text.push(
          `[Binary MCP resource omitted: ${itemUri} (${mime}, ${formatBytes(size)}) exceeds ${formatBytes(MAX_MCP_RESOURCE_BLOB_BYTES)}]`,
        )
        continue
      }
      text.push(`[Binary MCP resource attached: ${itemUri} (${mime})]`)
      attachments.push({
        type: "file",
        mime,
        url: `data:${mime};base64,${item.blob}`,
        filename: itemUri,
      })
      continue
    }
    text.push(`[MCP resource content without text or blob: ${itemUri}]`)
  }

  return {
    contents: items.length,
    attachments,
    text: text.join("\n\n") || `MCP resource ${uri} from ${server} returned no contents.`,
  }
}

function base64Size(value: string) {
  const trimmed = value.replace(/\s/g, "")