olp/docs/provider-audits/anthropic.md

Anthropic provider — version-capture artifact

• Provider key: anthropic
• Plugin file: lib/providers/anthropic.mjs
• Last capture: 2026-05-24 (D36 #15)
• Capture host: project maintainer's primary workstation (home-mac)
• Status: living artifact — re-capture at every plugin touch, or annually during the 14 May Annual Alignment Audit, whichever comes first.

This artifact closes the circular-citation finding from Round-6 (issue #15): ALIGNMENT.md § Provider Authority Pins anthropic row cites @anthropic-ai/claude-code v2.1.89 (observed at D4) without an independent transcript; the plugin header cited the observation date but pointed back to ALIGNMENT.md. This file is the in-repo transcript artifact that grounds the OLP-side claim.

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Observed claude --version

The live binary on the maintainer's workstation today is:

2.1.132 (Claude Code)

Captured by running claude --version in a non-interactive shell on 2026-05-24.

Plugin-pinned version

@anthropic-ai/claude-code v2.1.89

Source: ALIGNMENT.md § Authorities § "Provider authority pins" row anthropic ("OLP-side pin: @anthropic-ai/claude-code v2.1.89 (observed at D4 — lib/providers/anthropic.mjs header)"). This is the version observed inside the OLP-side D4 work; the plugin was authored against this version's flag surface.

Version drift note

The pinned version (v2.1.89, D4) and the live binary (v2.1.132, today) differ because the claude CLI has continued to ship updates since D4. This drift is within tolerance for the v0.1 baseline:

• The CLI flags OLP consumes — -p, --output-format=text, --no-session-persistence, --model, --debug — are all still present and semantically unchanged in v2.1.132 (verified today via claude -p --help — see "Flag surface captured today" below).
• The pin in ALIGNMENT.md is conservative by design — it names the version OLP was authored against, not the highest version known to work. Re-pinning to v2.1.132 (or whichever version is current) is the right action at the next Anthropic-plugin touch, when a reviewer can confirm no regressions.
• Re-audit recommended at: (a) next material change to lib/providers/anthropic.mjs, OR (b) 14 May 2027 Annual Alignment Audit, OR (c) the post-2026-06-15 one-shot triggered audit (ALIGNMENT.md § One-shot Triggered Audits) — whichever comes first.

Sample invocation

The Anthropic plugin spawns the CLI with this argument shape (see lib/providers/anthropic.mjs § buildClaudeArgs and _spawnAndStream):

claude -p --output-format text --no-session-persistence --model <model> [--debug]

• -p puts the CLI in non-interactive (print-and-exit) mode.
• --output-format text selects plain-text stdout. The plugin parses stdout as plain text (no NDJSON envelope).
• --no-session-persistence disables session storage so OLP remains stateless (per ADR 0001 § Non-mission — OLP is not a conversation-state store).
• --model <model> is forwarded from the IR's model field.
• --debug is added only when OLP_DEBUG_CLAUDE env is set, for development.

The prompt is written to the CLI's stdin (messagesToPrompt(ir.messages) from anthropic.mjs), not passed as a positional argument.

Flag surface captured today

Excerpt from claude -p --help on host home-mac on 2026-05-24 (v2.1.132). Only the flags relevant to OLP's invocation are reproduced; the full help is much larger.

Flag	Description (verbatim, abridged)
-p, --print	Print response and exit (useful for pipes).
--output-format <format>	Output format (only works with --print): "text" (default), "json" (single result), or "stream-json" (realtime streaming) — choices: "text", "json", "stream-json".
--no-session-persistence	Disable session persistence — sessions will not be saved to disk and cannot be resumed (only works with --print).
--model <model>	Model for the current session. Provide an alias for the latest model (e.g. 'sonnet' or 'opus') or a model's full name (e.g. 'claude-sonnet-4-6').
-d, --debug [filter]	Enable debug mode with optional category filtering (e.g., "api,hooks" or "!1p,!file").

All four load-bearing flags (-p, --output-format, --no-session-persistence, --model) are present and accept the same value formats the OLP plugin uses. The --debug flag is also present with the same semantics.

Citation cross-references

• ALIGNMENT.md § Authorities § "Provider authority pins" anthropic row — names this file as the transcript-artifact pin.
• lib/providers/anthropic.mjs header lines 1-50 — names this file as the version-capture artifact (D26 F18 follow-up).
• ADR 0001 § Mission inheritance — establishes claude -p as Authority 1 source for the anthropic plugin.
• ADR 0005 Amendment 5 (D31 F11) — clarifies the wire limitation of claude -p --output-format text w.r.t. cache_control marker delegation.

Recapture procedure

When this artifact is next refreshed (per the "Version drift note" trigger list), the maintainer should:

1. Run claude --version on the project maintainer's primary workstation.
2. Run claude -p --help and verify that -p, --output-format, --no-session-persistence, --model, and --debug are all still present with the same value formats.
3. Update the "Last capture", "Observed claude --version", and "Flag surface captured today" sections with the new values.
4. If any flag's semantic has changed (not just a version bump), file an ADR amendment on lib/providers/anthropic.mjs Authority 1 source and pin the new version in ALIGNMENT.md.
5. If claude -p --help no longer enumerates one of OLP's load-bearing flags, the plugin is broken against the new CLI — file a deletion or migration PR per ALIGNMENT.md Rule 4 (Unalignable Plugins / Fields Are Deleted).