CodeSampleX

Sample

go.uber.org/zap v1.13.0: New

Verified sample for golang go.uber.org/zap v1.13.0: New. The contract ran on go 1.26 · linux debian/x64 · docker and passed: zap.New initializes a Logger…

sha256:99cd4465f6bcf9b7d6fcfd28ad766124910bfed61a9095acaed5b5e0619d33e6

This network offers one thing: a sample that builds. It ran the sample in a sandbox and kept the signed receipt. It grades nothing and warrants nothing — whether the same code builds where you are is not something it measured. How many distinct signing keys filed a passing contract receipt. One is the author alone; more than one means somebody else built it too. A key is self-generated with nothing registered behind it, so it counts keys, not people. MIT-0

Execution evidence

The declared environment and the signed runs are kept apart, so you can see exactly what this sample ran and where.

Evidence basis
Signed contract pass
Verification receipts
1
Signing keys that built it
1
Declared environment linux 24 · ubuntu · glibc 2.39 x64 go

Verification-run environments

Environment Contract Stages Run
go 1.26 · linux debian/x64 · docker ed25519:c1973797be207ac4 PASS compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS
CONTAINER_RUN · golang@1golang:1.26@sha256:e30143be198a…		 2026-09-15

Case

HOW
Goal
verify go.uber.org/zap.New in pkg:golang/go.uber.org/zap@v1.13.0
Packages
Symbols
  • go.uber.org/zap.New
Created
2026-09-15T23:06:46Z

Contract

  1. zap.New initializes a Logger with base zap.Fields that are included in every emitted log entry
  2. zap.New with zap.Hooks executes registered callbacks on each logged entry
  3. zap.New with zap.AddCaller records caller file and line location for logged entries
  4. zap.New with nil core returns a safe no-op logger that does not panic on log calls

Files

  • PROMPT.md
  • csx.json
  • go.mod
  • go.sum
  • sample.go
  • spec.json
  • test/contract.go

Download the source artifact (tar.gz)

Source

PROMPT.md
Clean-room public code sample — generation instructions

Write a brand-new, minimal, self-contained code sample in this clean-room directory.
Do not copy, paraphrase, or reference any existing project source. Work only from this spec.

A csx.json manifest scaffold already exists. Do not recreate it from memory. Preserve its case.goal, packages and symbols; fill its empty case.contract with exact assertions and correct its environment, commands and verifierAdapter for the files you generate.

Goal: verify go.uber.org/zap.New in pkg:golang/go.uber.org/zap@v1.13.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/go.uber.org/zap@v1.13.0
Demonstrate these symbols/APIs:
  - go.uber.org/zap.New

Rules:
  - One focused purpose; the smallest project that proves the goal.
  - Include a contract test (test/contract.*) that runs OFFLINE and exits 0 exactly when the goal behavior works.
  - Pin every dependency with a lockfile so resolution is reproducible.
  - No secrets, credentials, or tokens. No real URLs (only example.com or localhost). No absolute paths.
  - No personal names, emails, company names, or project identifiers of any kind.
  - No binaries and no generated output (node_modules, dist, target, venv, .git, .env).
  - Keep it under 200 files and 256KB packed.
csx.json
{"case":{"caseId":"case:sha256:85f05ade5dfb65721411b1f7cbe51e0bb31fefd79d41a19c34bc95c2e214b47e","contract":["zap.New initializes a Logger with base zap.Fields that are included in every emitted log entry","zap.New with zap.Hooks executes registered callbacks on each logged entry","zap.New with zap.AddCaller records caller file and line location for logged entries","zap.New with nil core returns a safe no-op logger that does not panic on log calls"],"goal":"verify go.uber.org/zap.New in pkg:golang/go.uber.org/zap@v1.13.0","kind":"HOW","packages":["pkg:golang/go.uber.org/zap@v1.13.0"],"schemaVersion":1,"symbols":["go.uber.org/zap.New"]},"contractCommand":["go","run","./test"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"golang","libc":"glibc","libcVersion":"2.39","os":"linux","osVersionBucket":"24","packageManager":"go","schemaVersion":1},"license":"MIT-0","packages":["pkg:golang/go.uber.org/zap@v1.13.0"],"schemaVersion":1,"subject":"pkg:golang/go.uber.org/zap@v1.13.0","symbols":["go.uber.org/zap.New"],"verifierAdapter":"golang@1"}
go.mod
module sample

go 1.22.0

require go.uber.org/zap v1.13.0

require (
	github.com/BurntSushi/toml v0.3.1 // indirect
	go.uber.org/atomic v1.5.0 // indirect
	go.uber.org/multierr v1.3.0 // indirect
	go.uber.org/tools v0.0.0-20190618225709-2cfd321de3ee // indirect
	golang.org/x/lint v0.0.0-20190930215403-16217165b5de // indirect
	golang.org/x/tools v0.0.0-20191029190741-b9c20aec41a5 // indirect
	honnef.co/go/tools v0.0.1-2019.2.3 // indirect
)
go.sum
github.com/BurntSushi/toml v0.3.1 h1:WXkYYl6Yr3qBf1K79EBnL4mak0OimBfB0XUf9Vl28OQ=
github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/google/renameio v0.1.0/go.mod h1:KWCgfxg9yswjAJkECMjeO8J8rahYeXnNhOm40UhjYkI=
github.com/kisielk/gotool v1.0.0/go.mod h1:XhKaO+MFFWcvkIS/tQcRk01m1F5IRFswLeQ+oQHNcck=
github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORNo=
github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
github.com/pkg/errors v0.8.1 h1:iURUrRGxPUNPdy5/HRSm+Yj6okJ6UtLINN0Q9M4+h3I=
github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
github.com/rogpeppe/go-internal v1.3.0/go.mod h1:M8bDsm7K2OlrFYOpmOWEs/qY81heoFRclV5y23lUDJ4=
github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
github.com/stretchr/testify v1.4.0 h1:2E4SXV/wtOkTonXsotYi4li6zVWxYlZuYNCXe9XRJyk=
github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81PSLYec5m4=
go.uber.org/atomic v1.5.0 h1:OI5t8sDa1Or+q8AeE+yKeB/SDYioSHAgcVljj9JIETY=
go.uber.org/atomic v1.5.0/go.mod h1:sABNBOSYdrvTF6hTgEIbc7YasKWGhgEQZyfxyTvoXHQ=
go.uber.org/multierr v1.3.0 h1:sFPn2GLc3poCkfrpIXGhBD2X0CMIo4Q/zSULXrj/+uc=
go.uber.org/multierr v1.3.0/go.mod h1:VgVr7evmIr6uPjLBxg28wmKNXyqE9akIJ5XnfpiKl+4=
go.uber.org/tools v0.0.0-20190618225709-2cfd321de3ee h1:0mgffUl7nfd+FpvXMVz4IDEaUSmT1ysygQC7qYo7sG4=
go.uber.org/tools v0.0.0-20190618225709-2cfd321de3ee/go.mod h1:vJERXedbb3MVM5f9Ejo0C68/HhF8uaILCdgjnY+goOA=
go.uber.org/zap v1.13.0 h1:nR6NoDBgAf67s68NhaXbsojM+2gxp3S1hWkHDl27pVU=
go.uber.org/zap v1.13.0/go.mod h1:zwrFLgMcdUuIBviXEYEH1YKNaOBnKXsx2IPda5bBwHM=
golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
golang.org/x/crypto v0.0.0-20190510104115-cbcb75029529/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
golang.org/x/lint v0.0.0-20190930215403-16217165b5de h1:5hukYrvBGR8/eNkX5mdUezrA6JiaEZDtJb9Ei+1LlBs=
golang.org/x/lint v0.0.0-20190930215403-16217165b5de/go.mod h1:6SW0HCj/g11FgYtHlgUYUwCkIfeOF89ocIRzGO/8vkc=
golang.org/x/mod v0.0.0-20190513183733-4bf6d317e70e/go.mod h1:mXi4GBBbnImb6dmsKGUJ2LatrhH/nqhxcFungHvyanc=
golang.org/x/net v0.0.0-20190311183353-d8887717615a/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
golang.org/x/tools v0.0.0-20190311212946-11955173bddd/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
golang.org/x/tools v0.0.0-20190621195816-6e04913cbbac/go.mod h1:/rFqwRUd4F7ZHNgwSSTFct+R/Kf4OFW1sUzUTQQTgfc=
golang.org/x/tools v0.0.0-20191029041327-9cc4af7d6b2c/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
golang.org/x/tools v0.0.0-20191029190741-b9c20aec41a5 h1:hKsoRgsbwY1NafxrwTs+k64bikrLBkAgPir1TNCj3Zs=
golang.org/x/tools v0.0.0-20191029190741-b9c20aec41a5/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
honnef.co/go/tools v0.0.1-2019.2.3 h1:3JgtbtFHMiCmsznwGVTUWbgGov+pVqnlf1dEJTNAXeM=
honnef.co/go/tools v0.0.1-2019.2.3/go.mod h1:a3bituU0lyd329TUQxRnasdCoJDkEUEAqEt0JzvZhAg=
sample.go
package sample

import (
	"go.uber.org/zap"
	"go.uber.org/zap/zapcore"
)

// NewLogger constructs a zap.Logger wrapping the core with optional settings.
func NewLogger(core zapcore.Core, options ...zap.Option) *zap.Logger {
	return zap.New(core, options...)
}

// NewLoggerWithHook constructs a zap.Logger with an attached entry hook.
func NewLoggerWithHook(core zapcore.Core, hook func(zapcore.Entry) error, options ...zap.Option) *zap.Logger {
	opts := append([]zap.Option{zap.Hooks(hook)}, options...)
	return zap.New(core, opts...)
}
spec.json
{
  "schemaVersion": 1,
  "goal": "verify go.uber.org/zap.New in pkg:golang/go.uber.org/zap@v1.13.0",
  "kind": "HOW",
  "packages": [
    "pkg:golang/go.uber.org/zap@v1.13.0"
  ],
  "symbols": [
    "go.uber.org/zap.New"
  ]
}
test/contract.go
package main

import (
	"fmt"
	"os"

	"sample"

	"go.uber.org/zap"
	"go.uber.org/zap/zapcore"
	"go.uber.org/zap/zaptest/observer"
)

func main() {
	// 1. zap.New initializes a Logger with base zap.Fields that are included in every emitted log entry
	core1, logs1 := observer.New(zapcore.InfoLevel)
	logger1 := sample.NewLogger(core1, zap.Fields(zap.String("service", "auth-service")))
	logger1.Info("user login", zap.String("user", "alice"))

	entries1 := logs1.All()
	if len(entries1) != 1 {
		fmt.Fprintf(os.Stderr, "contract failed: expected 1 log entry, got %d\n", len(entries1))
		os.Exit(1)
	}
	ctx1 := entries1[0].ContextMap()
	if ctx1["service"] != "auth-service" {
		fmt.Fprintf(os.Stderr, "contract failed: missing or invalid 'service' field: %#v\n", ctx1)
		os.Exit(1)
	}
	if ctx1["user"] != "alice" {
		fmt.Fprintf(os.Stderr, "contract failed: missing or invalid 'user' field: %#v\n", ctx1)
		os.Exit(1)
	}

	// 2. zap.New with zap.Hooks executes registered callbacks on each logged entry
	core2, _ := observer.New(zapcore.InfoLevel)
	var hookedMessages []string
	hook := func(entry zapcore.Entry) error {
		hookedMessages = append(hookedMessages, entry.Message)
		return nil
	}
	logger2 := sample.NewLoggerWithHook(core2, hook)
	logger2.Info("first event")
	logger2.Info("second event")
	if len(hookedMessages) != 2 || hookedMessages[0] != "first event" || hookedMessages[1] != "second event" {
		fmt.Fprintf(os.Stderr, "contract failed: hook was not called properly: %#v\n", hookedMessages)
		os.Exit(1)
	}

	// 3. zap.New with zap.AddCaller records caller file and line location for logged entries
	core3, logs3 := observer.New(zapcore.InfoLevel)
	logger3 := sample.NewLogger(core3, zap.AddCaller())
	logger3.Info("caller test")
	entries3 := logs3.All()
	if len(entries3) != 1 {
		fmt.Fprintf(os.Stderr, "contract failed: expected 1 log entry, got %d\n", len(entries3))
		os.Exit(1)
	}
	if !entries3[0].Caller.Defined {
		fmt.Fprintf(os.Stderr, "contract failed: caller is not defined\n")
		os.Exit(1)
	}
	if entries3[0].Caller.File == "" || entries3[0].Caller.Line == 0 {
		fmt.Fprintf(os.Stderr, "contract failed: caller file or line empty: %#v\n", entries3[0].Caller)
		os.Exit(1)
	}

	// 4. zap.New with nil core returns a safe no-op logger that does not panic on log calls
	logger4 := sample.NewLogger(nil)
	if logger4 == nil {
		fmt.Fprintf(os.Stderr, "contract failed: zap.New(nil) returned nil logger\n")
		os.Exit(1)
	}
	logger4.Debug("nop debug")
	logger4.Info("nop info")
	logger4.Warn("nop warn")
	logger4.Error("nop error")

	fmt.Println("PASS")
}

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