diff --git a/AGENTS.md b/AGENTS.md
index a7894f2a2..2c53e16aa 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -80,3 +80,11 @@ Test fixture provides:
 ## Runtime
 
 The CLI entrypoint (`cli/entrypoint.js`) selects between Bun and tsx as the TypeScript runner, preferring Bun when available. This allows hot-reload during development while maintaining Node.js compatibility.
+# bump 1778256007
+# bump 1778299207
+# bump 1778342407
+# bump 1778385607
+# bump 1778515208
+# bump 1778558407
+# bump 1778601608
+# bump 1778644807
diff --git a/cli/build/register.ts b/cli/build/register.ts
index ffc7b8397..436abbf44 100644
--- a/cli/build/register.ts
+++ b/cli/build/register.ts
@@ -732,7 +732,16 @@ export const registerBuild = (program: Command) => {
           const entryFile = fileArgIsDirectFile
             ? resolvedFileArgPath
             : transpileEntrypoint
-          if (!entryFile) {
+          const isRealTsEntrypoint = Boolean(
+            entryFile &&
+              (entryFile.endsWith(".ts") || entryFile.endsWith(".tsx")),
+          )
+          if (
+            !entryFile ||
+            (hasConfiguredIncludeBoardFiles &&
+              !transpileExplicitlyRequested &&
+              !isRealTsEntrypoint)
+          ) {
             if (
               hasConfiguredIncludeBoardFiles &&
               !transpileExplicitlyRequested
diff --git a/lib/shared/get-entrypoint.ts b/lib/shared/get-entrypoint.ts
index c2858b38d..770cce979 100644
--- a/lib/shared/get-entrypoint.ts
+++ b/lib/shared/get-entrypoint.ts
@@ -1,5 +1,6 @@
 import * as fs from "node:fs"
 import * as path from "node:path"
+import { globbySync } from "globby"
 import { loadProjectConfig } from "lib/project-config"
 import kleur from "kleur"
 
@@ -202,6 +203,27 @@ 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 = globbySync(
+      ["**/*.circuit.json", "**/circuit.json"],
+      {
+        cwd: validatedProjectDir,
+        ignore: ["**/node_modules/**", "**/dist/**"],
+      },
+    )
+      .map((f) => path.resolve(validatedProjectDir, f))
+      .filter(
+        (f) => fs.existsSync(f) && isValidDirectory(f, 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 28ee40c54..ff30ef7de 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"))
+})