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+<!-- m-wiki: type=concept slug=scm-variable-scope topic=build base-sha=28f54cf7bef9 generated-at=2026-05-12T00:00:00+00:00 sources=[] -->
+
+> Generated 2026-05-12 at base-sha 28f54cf7bef9. Type: concept. 0 sources.
+
+# SCM Variable Scope
+
+The `scm` variable is only available inside consumer Jenkinsfiles, not inside `vars/` or `src/` of the shared library. Referencing it in library code causes a runtime `MissingPropertyException`.
+
+## Where it applies in this repo
+
+`vars/eksCICD.groovy` and all files under `src/com/meesho/`
+
+## Why `scm` is unavailable
+
+The `scm` variable (branch, remote URL, credentials) is injected by the GitHub Branch Source plugin into **consumer Jenkinsfiles** at the time they are loaded by Jenkins. Library code (everything under `vars/` and `src/`) is a separate classloader context — the plugin does not inject `scm` there.
+
+Attempting to access `scm.branches` or `scm.userRemoteConfigs` from library code will throw:
+
+```
+MissingPropertyException: No such property: scm for class: groovy.lang.Binding
+```
+
+## Correct alternatives
+
+Inside library code, use the Jenkins-injected environment variables instead:
+
+| Need | Use instead of `scm.*` |
+|------|------------------------|
+| Branch name | `env.BRANCH_NAME` |
+| Repository URL | `env.GIT_URL` |
+| PR number | `env.CHANGE_ID` |
+| PR source branch | `env.CHANGE_BRANCH` |
+| PR target branch | `env.CHANGE_TARGET` |
+
+All of these are set by the GitHub Branch Source plugin before library code runs.
+
+## Related
+
+- [Entry points](../02-ENTRYPOINTS.md) — where this constraint applies
+- [Environment mapping](../05-ENVIRONMENT-MAPPING.md) — `env.CHANGE_ID` is the PR-build detector
+
+## Sources
+
+(no raw/ sources)
+
+## Notes
+
+<!-- Anything below is human-owned. wiki-init never reads or modifies content under this heading. -->
+
+---
+
+[← Wiki index](../../index.md)
+
+<!-- atomic: keep this page ≤600 words. New scope → new concept page that builds on this one. Do not append paragraphs here. -->