Sandbox images
Validate a blueprint
Lint blueprint YAML without saving it. Returns 200 with ok: false + structured errors for an invalid blueprint; the authoritative rejection still happens at create/update/build.
POST
/
projects
/
{projectId}
/
images
/
validate
Validate a blueprint
curl --request POST \
--url https://app.mcpjam.com/api/v1/projects/{projectId}/images/validate \
--header 'Authorization: Bearer <token>' \
--header 'Content-Type: application/json' \
--data '
{
"blueprint": "base: debian:bookworm-slim@sha256:<digest>\ninitialize:\n - name: Install tooling\n run: apt-get update && apt-get install -y git\nknowledge:\n - name: Test notes\n contents: Run `make test` before pushing.\n"
}
'import requests
url = "https://app.mcpjam.com/api/v1/projects/{projectId}/images/validate"
payload = { "blueprint": "base: debian:bookworm-slim@sha256:<digest>
initialize:
- name: Install tooling
run: apt-get update && apt-get install -y git
knowledge:
- name: Test notes
contents: Run `make test` before pushing.
" }
headers = {
"Authorization": "Bearer <token>",
"Content-Type": "application/json"
}
response = requests.post(url, json=payload, headers=headers)
print(response.text)const options = {
method: 'POST',
headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
body: JSON.stringify({
blueprint: 'base: debian:bookworm-slim@sha256:<digest>\ninitialize:\n - name: Install tooling\n run: apt-get update && apt-get install -y git\nknowledge:\n - name: Test notes\n contents: Run `make test` before pushing.\n'
})
};
fetch('https://app.mcpjam.com/api/v1/projects/{projectId}/images/validate', options)
.then(res => res.json())
.then(res => console.log(res))
.catch(err => console.error(err));<?php
$curl = curl_init();
curl_setopt_array($curl, [
CURLOPT_URL => "https://app.mcpjam.com/api/v1/projects/{projectId}/images/validate",
CURLOPT_RETURNTRANSFER => true,
CURLOPT_ENCODING => "",
CURLOPT_MAXREDIRS => 10,
CURLOPT_TIMEOUT => 30,
CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
CURLOPT_CUSTOMREQUEST => "POST",
CURLOPT_POSTFIELDS => json_encode([
'blueprint' => 'base: debian:bookworm-slim@sha256:<digest>
initialize:
- name: Install tooling
run: apt-get update && apt-get install -y git
knowledge:
- name: Test notes
contents: Run `make test` before pushing.
'
]),
CURLOPT_HTTPHEADER => [
"Authorization: Bearer <token>",
"Content-Type: application/json"
],
]);
$response = curl_exec($curl);
$err = curl_error($curl);
curl_close($curl);
if ($err) {
echo "cURL Error #:" . $err;
} else {
echo $response;
}package main
import (
"fmt"
"strings"
"net/http"
"io"
)
func main() {
url := "https://app.mcpjam.com/api/v1/projects/{projectId}/images/validate"
payload := strings.NewReader("{\n \"blueprint\": \"base: debian:bookworm-slim@sha256:<digest>\\ninitialize:\\n - name: Install tooling\\n run: apt-get update && apt-get install -y git\\nknowledge:\\n - name: Test notes\\n contents: Run `make test` before pushing.\\n\"\n}")
req, _ := http.NewRequest("POST", url, payload)
req.Header.Add("Authorization", "Bearer <token>")
req.Header.Add("Content-Type", "application/json")
res, _ := http.DefaultClient.Do(req)
defer res.Body.Close()
body, _ := io.ReadAll(res.Body)
fmt.Println(string(body))
}HttpResponse<String> response = Unirest.post("https://app.mcpjam.com/api/v1/projects/{projectId}/images/validate")
.header("Authorization", "Bearer <token>")
.header("Content-Type", "application/json")
.body("{\n \"blueprint\": \"base: debian:bookworm-slim@sha256:<digest>\\ninitialize:\\n - name: Install tooling\\n run: apt-get update && apt-get install -y git\\nknowledge:\\n - name: Test notes\\n contents: Run `make test` before pushing.\\n\"\n}")
.asString();require 'uri'
require 'net/http'
url = URI("https://app.mcpjam.com/api/v1/projects/{projectId}/images/validate")
http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true
request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n \"blueprint\": \"base: debian:bookworm-slim@sha256:<digest>\\ninitialize:\\n - name: Install tooling\\n run: apt-get update && apt-get install -y git\\nknowledge:\\n - name: Test notes\\n contents: Run `make test` before pushing.\\n\"\n}"
response = http.request(request)
puts response.read_body{
"ok": true,
"baseImageDigest": "<string>",
"errors": [
{
"path": "<string>",
"message": "<string>"
}
]
}
Authorizations
MCPJam API key (sk_…). Create one at Settings → API keys. Guest sessions cannot use the API, and API keys cannot manage other API keys.
Path Parameters
ID of the hosted project that contains the server.
Body
application/json
Blueprint YAML to lint.
Response
Lint result
- Option 1
- Option 2
Lint result. ok: true carries the resolved base digest; ok: false carries structured errors. Always returned with HTTP 200 — an invalid blueprint is a successful lint.
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Validate a blueprint
curl --request POST \
--url https://app.mcpjam.com/api/v1/projects/{projectId}/images/validate \
--header 'Authorization: Bearer <token>' \
--header 'Content-Type: application/json' \
--data '
{
"blueprint": "base: debian:bookworm-slim@sha256:<digest>\ninitialize:\n - name: Install tooling\n run: apt-get update && apt-get install -y git\nknowledge:\n - name: Test notes\n contents: Run `make test` before pushing.\n"
}
'import requests
url = "https://app.mcpjam.com/api/v1/projects/{projectId}/images/validate"
payload = { "blueprint": "base: debian:bookworm-slim@sha256:<digest>
initialize:
- name: Install tooling
run: apt-get update && apt-get install -y git
knowledge:
- name: Test notes
contents: Run `make test` before pushing.
" }
headers = {
"Authorization": "Bearer <token>",
"Content-Type": "application/json"
}
response = requests.post(url, json=payload, headers=headers)
print(response.text)const options = {
method: 'POST',
headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
body: JSON.stringify({
blueprint: 'base: debian:bookworm-slim@sha256:<digest>\ninitialize:\n - name: Install tooling\n run: apt-get update && apt-get install -y git\nknowledge:\n - name: Test notes\n contents: Run `make test` before pushing.\n'
})
};
fetch('https://app.mcpjam.com/api/v1/projects/{projectId}/images/validate', options)
.then(res => res.json())
.then(res => console.log(res))
.catch(err => console.error(err));<?php
$curl = curl_init();
curl_setopt_array($curl, [
CURLOPT_URL => "https://app.mcpjam.com/api/v1/projects/{projectId}/images/validate",
CURLOPT_RETURNTRANSFER => true,
CURLOPT_ENCODING => "",
CURLOPT_MAXREDIRS => 10,
CURLOPT_TIMEOUT => 30,
CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
CURLOPT_CUSTOMREQUEST => "POST",
CURLOPT_POSTFIELDS => json_encode([
'blueprint' => 'base: debian:bookworm-slim@sha256:<digest>
initialize:
- name: Install tooling
run: apt-get update && apt-get install -y git
knowledge:
- name: Test notes
contents: Run `make test` before pushing.
'
]),
CURLOPT_HTTPHEADER => [
"Authorization: Bearer <token>",
"Content-Type: application/json"
],
]);
$response = curl_exec($curl);
$err = curl_error($curl);
curl_close($curl);
if ($err) {
echo "cURL Error #:" . $err;
} else {
echo $response;
}package main
import (
"fmt"
"strings"
"net/http"
"io"
)
func main() {
url := "https://app.mcpjam.com/api/v1/projects/{projectId}/images/validate"
payload := strings.NewReader("{\n \"blueprint\": \"base: debian:bookworm-slim@sha256:<digest>\\ninitialize:\\n - name: Install tooling\\n run: apt-get update && apt-get install -y git\\nknowledge:\\n - name: Test notes\\n contents: Run `make test` before pushing.\\n\"\n}")
req, _ := http.NewRequest("POST", url, payload)
req.Header.Add("Authorization", "Bearer <token>")
req.Header.Add("Content-Type", "application/json")
res, _ := http.DefaultClient.Do(req)
defer res.Body.Close()
body, _ := io.ReadAll(res.Body)
fmt.Println(string(body))
}HttpResponse<String> response = Unirest.post("https://app.mcpjam.com/api/v1/projects/{projectId}/images/validate")
.header("Authorization", "Bearer <token>")
.header("Content-Type", "application/json")
.body("{\n \"blueprint\": \"base: debian:bookworm-slim@sha256:<digest>\\ninitialize:\\n - name: Install tooling\\n run: apt-get update && apt-get install -y git\\nknowledge:\\n - name: Test notes\\n contents: Run `make test` before pushing.\\n\"\n}")
.asString();require 'uri'
require 'net/http'
url = URI("https://app.mcpjam.com/api/v1/projects/{projectId}/images/validate")
http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true
request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n \"blueprint\": \"base: debian:bookworm-slim@sha256:<digest>\\ninitialize:\\n - name: Install tooling\\n run: apt-get update && apt-get install -y git\\nknowledge:\\n - name: Test notes\\n contents: Run `make test` before pushing.\\n\"\n}"
response = http.request(request)
puts response.read_body{
"ok": true,
"baseImageDigest": "<string>",
"errors": [
{
"path": "<string>",
"message": "<string>"
}
]
}

