[Nitro CLI] Prevent markup exception in middleware

[tobias-tengler]

Previously Spectre.Console would attempt to parse markup characters from the exception message and it might fail with the following exception:

Now we write directly to stderr.

[Copilot]

Pull request overview

This PR fixes a bug where Spectre.Console would attempt to parse markup characters from exception messages in the middleware exception handler, potentially causing markup parsing exceptions.

Changes:

• Updated exception middleware to write exception messages directly to stderr without markup parsing

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[github-actions]

🚀 Fusion Gateway Performance Results

Simple Composite Query

Constant Load (50 VUs)

Requests/sec	Error Rate
5808.08 req/s	0.00%

📊 Response Time Metrics

Min	Med	Max	Avg	P90	P95
0.78ms	7.14ms	163.01ms	8.45ms	13.13ms	18.64ms

Ramping Load (0→50→500→50 VUs)

Requests/sec	Error Rate
4629.76 req/s	0.00%

📊 Response Time Metrics

Min	Med	Max	Avg	P90	P95
0.73ms	39.01ms	265.51ms	47.94ms	106.65ms	124.16ms

Executed Query

fragment User on User {
  id
  username
  name
}

fragment Review on Review {
  id
  body
}

fragment Product on Product {
  inStock
  name
  price
  shippingEstimate
  upc
  weight
}

query TestQuery {
  topProducts(first: 5) {
    ...Product
    reviews {
      ...Review
      author {
        ...User
      }
    }
  }
}

Deep Recursion Query

Constant Load (50 VUs)

Requests/sec	Error Rate
268.82 req/s	0.00%

📊 Response Time Metrics

Min	Med	Max	Avg	P90	P95
12.81ms	173.71ms	585.76ms	180.44ms	225.49ms	250.56ms

Ramping Load (0→50→500→50 VUs)

Requests/sec	Error Rate
308.25 req/s	0.00%

📊 Response Time Metrics

Min	Med	Max	Avg	P90	P95
3.11ms	677.66ms	1701.83ms	687.46ms	1346.77ms	1471.03ms

Executed Query

fragment User on User {
  id
  username
  name
}

fragment Review on Review {
  id
  body
}

fragment Product on Product {
  inStock
  name
  price
  shippingEstimate
  upc
  weight
}

query TestQuery {
  users {
    ...User
    reviews {
      ...Review
      product {
        ...Product
        reviews {
          ...Review
          author {
            ...User
            reviews {
              ...Review
              product {
                ...Product
              }
            }
          }
        }
      }
    }
  }
  topProducts(first: 5) {
    ...Product
    reviews {
      ...Review
      author {
        ...User
        reviews {
          ...Review
          product {
            ...Product
          }
        }
      }
    }
  }
}

Variable Batching Throughput

Constant Load (50 VUs)

Requests/sec	Error Rate
23745.47 req/s	0.00%

📊 Response Time Metrics

Min	Med	Max	Avg	P90	P95
0.09ms	1.70ms	43.36ms	2.06ms	3.92ms	4.82ms

Ramping Load (0→50→500→50 VUs)

Requests/sec	Error Rate
18636.61 req/s	0.00%

📊 Response Time Metrics

Min	Med	Max	Avg	P90	P95
0.09ms	9.24ms	108.14ms	11.32ms	23.51ms	28.28ms

Executed Query

query TestQuery_8f7a46ce_2(
  $__fusion_1_upc: ID!
  $__fusion_2_price: Long!
  $__fusion_2_weight: Long!
) {
  productByUpc(upc: $__fusion_1_upc) {
    inStock
    shippingEstimate(weight: $__fusion_2_weight, price: $__fusion_2_price)
  }
}

Variables (5 sets batched in single request)

[
  { "__fusion_1_upc": "1", "__fusion_2_price": 899, "__fusion_2_weight": 100 },
  { "__fusion_1_upc": "2", "__fusion_2_price": 1299, "__fusion_2_weight": 1000 },
  { "__fusion_1_upc": "3", "__fusion_2_price": 15, "__fusion_2_weight": 20 },
  { "__fusion_1_upc": "4", "__fusion_2_price": 499, "__fusion_2_weight": 100 },
  { "__fusion_1_upc": "5", "__fusion_2_price": 1299, "__fusion_2_weight": 1000 }
]

No baseline data available for comparison.

---

Run 21172874818 • Commit 583bc04 • Tue, 20 Jan 2026 13:34:18 GMT

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 0.00%. Comparing base (ca63d0a) to head (331809f).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@     Coverage Diff      @@
##   main   #9051   +/-   ##
============================
============================

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