Searching code with Sourcegraph

Sourcegraph Code Search Skill

This skill enables autonomous code searching across repositories using the Sourcegraph CLI (src command).

When to Invoke This Skill

Use this skill when you need to:

• Research how features are implemented across codebases
• Find examples of API usage, patterns, or libraries
• Locate specific code patterns (functions, classes, imports)
• Analyze code across repositories (not just local files)
• Search commit history or diffs for changes
• Find security issues or credential leaks
• Understand architecture by searching for patterns
• Answer "where is X used?" questions across projects

Do NOT use for local file searches - use Grep/Glob instead.

Quick Start

Basic Search Syntax

src search 'PATTERN'              # Simple text search
src search -json 'PATTERN'        # JSON output for parsing
src search 'repo:REGEX PATTERN'   # Search specific repos
src search 'lang:go PATTERN'      # Search Go files only

Common Search Patterns

1. Find function/method implementations

src search 'lang:go func handleRequest'
src search 'lang:python def authenticate'

2. Search in specific repository

src search 'repo:github.com/org/repo$ TODO'
src search 'repo:sourcegraph/sourcegraph auth'

3. Search specific file types

src search 'file:\.go$ context.Context'
src search 'file:schema.graphql type User'

4. Search with multiple filters

src search 'repo:kubernetes lang:go file:test fmt.Errorf'
src search 'repo:react lang:typescript useState'

5. Search commit diffs/history

src search 'type:diff repo:myorg/ password'
src search 'type:commit author:username refactor'

6. Use boolean operators

src search 'repo:kubernetes (mutex OR lock) lang:go'
src search 'repo:react useState AND useEffect'
src search 'TODO -file:test'

Workflow

When invoked to search code:

1. Understand the search goal

   • What are we looking for?
   • Which repositories/languages?
   • What filters would narrow results?

2. Construct the query

   • Start with the search pattern
   • Add filters: repo:, lang:, file:
   • Use operators: AND, OR, NOT, -
   • Set pattern type if needed: patternType:regexp

3. Execute the search

   src search 'your query here'
   # Or for programmatic parsing:
   src search -json 'your query here'
   

4. Parse and analyze results

   • Extract relevant matches
   • Identify patterns or answers
   • Note repositories/files for further investigation

5. Refine if needed

   • Too many results? Add more filters
   • Too few? Broaden the search
   • Wrong results? Adjust pattern or filters

Key Filters (Quick Reference)

Pattern Types

• Literal (default): Exact text matching
• Regexp: Use patternType:regexp for regex (RE2 syntax)
• Structural: Use patternType:structural for syntax-aware matching

CLI Flags

• -json: Output results as JSON (for parsing)
• -stream: Stream results as they arrive
• -display N: Limit displayed results (with -stream)
• --: Separate flags from query (for queries starting with -)

Important Notes

Negation in Queries

Queries starting with negation need -- separator:

src search -- '-repo:foo/bar error'

Output Control

• Use -json for programmatic parsing
• Default output is formatted for terminal (with colors)
• Set NO_COLOR=t to disable colors
• Set COLOR=t to force colors when piping

Search Scope

• Sourcegraph searches across configured repositories
• Default excludes: fork:no archived:no
• Include with: fork:yes or archived:yes

Examples by Use Case

Finding Implementation Examples

# How do people handle authentication in Go?
src search 'lang:go repo:.*auth.* middleware'

# React hooks usage
src search 'lang:typescript repo:facebook/react use.*Hook'

Security Auditing

# Find hardcoded credentials
src search 'patternType:regexp (password|secret|api_key)\s*=\s*["'][^"']+["']'

# Exposed private keys
src search 'type:diff BEGIN.*PRIVATE KEY'

API Research

# How is this library used?
src search 'lang:python import requests'

# Find all GraphQL mutations
src search 'file:\.graphql$ type Mutation'

Refactoring Research

# Find deprecated API usage
src search 'repo:myorg/ oldDeprecatedFunction'

# Find TODO comments in non-test files
src search 'TODO -file:test -file:spec'

Advanced Features

For comprehensive syntax reference, pattern types, and advanced operators, see reference.md.

For more practical examples and complex query patterns, see examples.md.

Troubleshooting

No results?

• Check repository access/permissions
• Verify repository is indexed by Sourcegraph
• Try broader search terms
• Remove restrictive filters

Too many results?

• Add more specific filters
• Use lang: to narrow by language
• Use repo: with regex for specific repositories
• Combine with file: for specific paths

Syntax errors?

• Check regex syntax (RE2 format)
• Quote the entire query
• Use -- before queries starting with -
• Verify filter names are correct

Integration with Other Tools

After finding results with Sourcegraph:

• Use Read tool to examine specific files locally
• Use Grep for more detailed local searching
• Use Bash for git operations on repositories
• Use WebFetch to access repository URLs

Best Practices

1. Start broad, then narrow: Begin with simple patterns, add filters incrementally
2. Use appropriate pattern types: Literal for exact matches, regexp for patterns
3. Combine filters effectively: repo: + lang: + file: for precision
4. Parse JSON for programmatic analysis: Use -json when processing results
5. Respect quotas and limits: Sourcegraph may have rate limits or result limits
6. Cache insights: Remember patterns that work for future searches

Performance Tips

• Specific repo: filters are faster than broad searches
• Language filters (lang:) significantly narrow scope
• File filters (file:) reduce search surface
• Use count: to limit results when you just need examples
• Streaming (-stream) is better for large result sets

Reference Files

• reference.md: Complete syntax documentation, all filters, operators, pattern types
• examples.md: Practical search patterns organized by use case