diff --git a/cli/build/register.ts b/cli/build/register.ts
index c1b71c96..674eda27 100644
--- a/cli/build/register.ts
+++ b/cli/build/register.ts
@@ -762,6 +762,10 @@ export const registerBuild = (program: Command) => {
           const entryFile = fileArgIsDirectFile
             ? resolvedFileArgPath
             : transpileEntrypoint
+          const isRealTsEntrypoint = Boolean(
+            entryFile &&
+              (entryFile.endsWith(".ts") || entryFile.endsWith(".tsx")),
+          )
           if (!entryFile) {
             if (
               hasConfiguredIncludeBoardFiles &&
@@ -776,6 +780,12 @@ export const registerBuild = (program: Command) => {
               )
               exitBuild(1, "transpile entry file not found")
             }
+          } else if (!isRealTsEntrypoint && !transpileExplicitlyRequested) {
+            console.log(
+              hasConfiguredIncludeBoardFiles
+                ? "Skipping transpilation because includeBoardFiles is configured and no library entrypoint was found."
+                : "Skipping transpilation because entrypoint is not a TypeScript file.",
+            )
           } else {
             const transpileSuccess = await transpileFile({
               input: entryFile,
diff --git a/lib/shared/get-entrypoint.ts b/lib/shared/get-entrypoint.ts
index c2858b38..761b62af 100644
--- a/lib/shared/get-entrypoint.ts
+++ b/lib/shared/get-entrypoint.ts
@@ -82,6 +82,58 @@ const findEntrypointsRecursively = (
   return results
 }
 
+const findCircuitJsonFiles = (
+  dir: string,
+  projectDir: string,
+  maxDepth: number = MAX_SEARCH_DEPTH,
+): string[] => {
+  if (maxDepth <= 0 || !isValidDirectory(dir, projectDir)) {
+    return []
+  }
+
+  const results: string[] = []
+
+  try {
+    const entries = fs.readdirSync(dir, { withFileTypes: true })
+
+    for (const entry of entries) {
+      if (results.length >= MAX_RESULTS) break
+
+      if (
+        entry.isFile() &&
+        (entry.name === "circuit.json" || entry.name.endsWith(".circuit.json"))
+      ) {
+        const filePath = path.resolve(dir, entry.name)
+        if (isValidDirectory(filePath, projectDir)) {
+          results.push(filePath)
+        }
+      }
+    }
+
+    for (const entry of entries) {
+      if (results.length >= MAX_RESULTS) break
+
+      if (
+        entry.isDirectory() &&
+        !entry.name.startsWith(".") &&
+        entry.name !== "node_modules" &&
+        entry.name !== "dist"
+      ) {
+        const subdirPath = path.resolve(dir, entry.name)
+        if (isValidDirectory(subdirPath, projectDir)) {
+          results.push(
+            ...findCircuitJsonFiles(subdirPath, projectDir, maxDepth - 1),
+          )
+        }
+      }
+    }
+  } catch {
+    return []
+  }
+
+  return results
+}
+
 const validateProjectDir = (projectDir: string): string => {
   const resolvedDir = path.resolve(projectDir)
   if (!fs.existsSync(resolvedDir)) {
@@ -202,6 +254,19 @@ export const getEntrypoint = async ({
       }
     }
 
+    // No entrypoint found - check for circuit.json files as implicit entrypoints
+    // This allows `tsci push` to work the same as `tsci dev` which supports circuit.json files
+    const circuitJsonFiles = findCircuitJsonFiles(
+      validatedProjectDir,
+      validatedProjectDir,
+    ).sort()
+
+    if (circuitJsonFiles.length > 0) {
+      const chosenFile = path.relative(validatedProjectDir, circuitJsonFiles[0])
+      onSuccess(`Using circuit.json as implicit entrypoint: '${chosenFile}'`)
+      return circuitJsonFiles[0]
+    }
+
     onError(
       kleur.red(
         "No entrypoint found. Run 'tsci init' to bootstrap a basic project or specify a file with 'tsci push <file>'",
diff --git a/tests/get-entrypoint.test.ts b/tests/get-entrypoint.test.ts
index 28ee40c5..ff30ef7d 100644
--- a/tests/get-entrypoint.test.ts
+++ b/tests/get-entrypoint.test.ts
@@ -519,3 +519,49 @@ test("getEntrypoint warns when multiple common locations exist", async () => {
   expect(warnings[0]).toContain("Choosing 'index.tsx'")
   expect(warnings[0]).toContain("'src/index.tsx'")
 })
+
+test("getEntrypoint returns circuit.json as implicit entrypoint when no tsx/ts files exist", async () => {
+  const { tmpDir } = await getCliTestFixture()
+
+  // Create only a circuit.json file, no tsx/ts entrypoints
+  await fs.writeFile(
+    path.join(tmpDir, "prebuilt.circuit.json"),
+    JSON.stringify([{ type: "source_component", name: "U1" }]),
+  )
+
+  let onSuccessMessage = ""
+  const entrypoint = await getEntrypoint({
+    projectDir: tmpDir,
+    onSuccess: (msg) => {
+      onSuccessMessage = msg
+    },
+  })
+
+  expect(entrypoint).not.toBeNull()
+  expect(entrypoint).toBe(path.join(tmpDir, "prebuilt.circuit.json"))
+  expect(onSuccessMessage).toContain(
+    "Using circuit.json as implicit entrypoint",
+  )
+})
+
+test("getEntrypoint prefers tsx entrypoint over circuit.json", async () => {
+  const { tmpDir } = await getCliTestFixture()
+
+  // Create both a circuit.json and an index.tsx
+  await fs.writeFile(
+    path.join(tmpDir, "prebuilt.circuit.json"),
+    JSON.stringify([{ type: "source_component", name: "U1" }]),
+  )
+  await fs.writeFile(
+    path.join(tmpDir, "index.tsx"),
+    'export default () => <board width="10mm" height="10mm"></board>',
+  )
+
+  const entrypoint = await getEntrypoint({
+    projectDir: tmpDir,
+  })
+
+  // Should prefer the tsx file since it comes first in ALLOWED_ENTRYPOINT_NAMES
+  expect(entrypoint).not.toBeNull()
+  expect(entrypoint).toBe(path.join(tmpDir, "index.tsx"))
+})