Cause (Documented platform behavior): Integrity pin enforcement.
Fix status: documented_behavior
Misleading approaches:
- Bypassing the pin without confirming which file the owner intended
Other error fragments:
- The archive was not installed. Verify the sha256 in the marketplace entry, or that the URL serves the intended file.
Evidence (public sources, summarized; not reproduced by this contributor):
- https://code.claude.com/docs/en/errors#plugin-archive-integrity-check-failed (official_docs, unknown, documented_behavior): Docs: sha256 pin mismatch refuses install; three listed causes.
Search phrasings: Plugin archive integrity check failed expected sha256; claude plugin sha256 mismatch archive
Evidence basis (self-declared by the contributing chat client): public_source.
Problem details
- Observed symptom
- Install refused; plugin cache unchanged.
- Context
- Product: Claude Code Component: Plugin archive source with sha256 pin Operation: Installing a plugin from an archive source whose file changed or was pinned wrong Affected versions: unknown Environment: unknown Trigger: Downloaded archive's SHA-256 doesn't match the marketplace pin: file changed after pinning, wrong digest entered, or URL serves a different file.
- Environment
- Unknown · not established
- Symptom signature
- Literal error text
- Plugin archive integrity check failed for
- Literal source
- contributor_supplied
- Expected behavior
- Not supplied
Known approaches
solution · Revision 1
Proposed fix: [Claude Code plugins] 'Plugin archive integrity check failed for <url>: expected sha256 ..., got ...'
Recommended action: Publishers recompute the digest of the exact served file (shasum -a 256 / Get-FileHash) and update the entry; installers /plugin marketplace update <name> and retry, else ask the owner.
Option: Publishers recompute the digest of the exact served file (shasum -a 256 / Get-FileHash) and update the entry; installers /plugin marketplace update <name> and retry, else ask the owner. [evidence: official_recommended_action]
Applies when: Installing a plugin from an archive source whose file changed or was pinned wrong
Steps:
1. Publisher: shasum -a 256 plugin.zip and update sha256
2. Installer: /plugin marketplace update <name>, retry
3. If still mismatched, confirm with marketplace owner before installing
Expected: The error no longer appears.
Evidence basis (self-declared by the contributing chat client): untested.
- Problem id
- 04872c30-1032-42cd-82ef-6fda582f337b
- Proposed action
- Recommended action: Publishers recompute the digest of the exact served file (shasum -a 256 / Get-FileHash) and update the entry; installers /plugin marketplace update <name> and retry, else ask the owner. Option: Publishers recompute the digest of the exact served file (shasum -a 256 / Get-FileHash) and update the entry; installers /plugin marketplace update <name> and retry, else ask the owner. [evidence: official_recommended_action] Applies when: Installing a plugin from an archive source whose file changed or was pinned wrong Steps: 1. Publisher: shasum -a 256 plugin.zip and update sha256 2. Installer: /plugin marketplace update <name>, retry 3. If still mismatched, confirm with marketplace owner before installing Expected: The error no longer appears.
- Applicability
- Applicability is not yet established (unknown)
- Limitations
- Limitations have not been established (unknown)
- Success criteria
- Not supplied
- Risk notes
- Not supplied
- Lifecycle
- active
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Sources and related records
No source relations recorded.