diff --git a/src/parser.ts b/src/parser.ts
index f6a4656..4fd7e14 100644
--- a/src/parser.ts
+++ b/src/parser.ts
@@ -3736,15 +3736,26 @@ async function runParse(
       ? { id: s.sourceId, label: s.sourceLabel, path: s.sourcePath, kind: s.sourceKind }
       : undefined,
   }))
+  // Claude is scanned through scanProjectDirs rather than parseProviderSources, so
+  // it needs the same provider-filter guard the durable-orphan loop below applies at
+  // its own level. Without it a --provider <other> run still enters scanProjectDirs
+  // with an empty dirs list, and the orphan pass there (which reads the whole cached
+  // claude section) treats every cached file as "no longer discovered" and re-injects
+  // it into the result. Note this is deliberately NOT a `claudeDirs.length > 0` check:
+  // when claude IS in scope but every transcript has been pruned from disk, that
+  // orphan pass is exactly what keeps PR-attributed spend from vanishing.
+  const claudeInScope = !providerFilter || providerFilter === 'all' || providerFilter === 'claude'
   if (claudeSources.length > 0) emitScanProgress({ kind: 'provider', provider: 'claude', state: 'start' })
   let claudeProjects: ProjectSummary[] = []
-  try {
-    claudeProjects = await scanProjectDirs(claudeDirs, seenMsgIds, diskCache, dateRange, saveProgress, readOnly)
-    if (claudeSources.length > 0) emitScanProgress({ kind: 'provider', provider: 'claude', state: 'done', files: claudeSources.length })
-  } catch (err) {
-    if (!isPermissionError(err)) throw err
-    process.stderr.write(`codeburn: skipped claude data (permission denied; grant Full Disk Access to include it)\n`)
-    emitScanProgress({ kind: 'provider', provider: 'claude', state: 'skipped' })
+  if (claudeInScope) {
+    try {
+      claudeProjects = await scanProjectDirs(claudeDirs, seenMsgIds, diskCache, dateRange, saveProgress, readOnly)
+      if (claudeSources.length > 0) emitScanProgress({ kind: 'provider', provider: 'claude', state: 'done', files: claudeSources.length })
+    } catch (err) {
+      if (!isPermissionError(err)) throw err
+      process.stderr.write(`codeburn: skipped claude data (permission denied; grant Full Disk Access to include it)\n`)
+      emitScanProgress({ kind: 'provider', provider: 'claude', state: 'skipped' })
+    }
   }
 
   const otherProjects: ProjectSummary[] = []
diff --git a/tests/parser.test.ts b/tests/parser.test.ts
index 5de2dad..211c41f 100644
--- a/tests/parser.test.ts
+++ b/tests/parser.test.ts
@@ -488,3 +488,114 @@ describe('(g) skill attribution is independent of turn category', () => {
     expect(session!.skillBreakdown['telemetry-review']?.turns).toBe(1)
   })
 })
+
+// ═══════════════════════════════════════════════════════════════════════════
+// (h) Provider filter isolates claude: a --provider <other> run must not
+//     re-surface cached claude sessions through the orphan pass, while a run
+//     that DOES include claude still preserves PR-bearing orphans.
+// ═══════════════════════════════════════════════════════════════════════════
+describe('(h) provider filter excludes claude from the orphan pass', () => {
+  const SYNTH_SOURCE = (path: string): SessionSource[] =>
+    [{ path, project: 'synth-proj', provider: 'test-synthetic' }]
+
+  // The provider lives on each parsed call, not on SessionSummary.
+  const providersOf = (projects: Awaited<ReturnType<typeof parseAllSessions>>): Set<string> =>
+    new Set(projects
+      .flatMap(p => p.sessions)
+      .flatMap(s => s.turns)
+      .flatMap(t => t.assistantCalls)
+      .map(c => c.provider))
+
+  const SYNTH_CALL: ParsedProviderCall = {
+    provider: 'test-synthetic', model: 'gpt-4o',
+    inputTokens: 10, outputTokens: 5,
+    cacheCreationInputTokens: 0, cacheReadInputTokens: 0,
+    cachedInputTokens: 0, reasoningTokens: 0, webSearchRequests: 0,
+    costUSD: 0.25, tools: [], bashCommands: [],
+    skills: [],
+    timestamp: '2026-07-18T12:00:00.000Z',
+    speed: 'standard',
+    deduplicationKey: 'synth-isolation-call',
+    userMessage: '', sessionId: 'synth-isolation-session',
+  }
+
+  // A claude transcript carrying a pr-link: `prLinks` is exactly what lets a
+  // cached entry survive the write-mode orphan gate, so it is the shape that
+  // leaks. Cost is deliberately far larger than the synthetic call's, so a leak
+  // is unmistakable rather than a rounding difference.
+  async function writeClaudeSessionWithPrLink(): Promise<string> {
+    const projectDir = join(tmpHome, '.claude', 'projects', 'leaky-app')
+    await mkdir(projectDir, { recursive: true })
+    const filePath = join(projectDir, 'session.jsonl')
+    await writeFile(filePath, [
+      JSON.stringify({
+        type: 'user', sessionId: 'claude-leak-1', timestamp: '2026-07-18T12:00:00.000Z',
+        message: { role: 'user', content: 'ship it' },
+      }),
+      JSON.stringify({
+        type: 'assistant', sessionId: 'claude-leak-1', timestamp: '2026-07-18T12:00:10.000Z',
+        message: {
+          id: 'msg-leak-1', type: 'message', role: 'assistant', model: 'claude-sonnet-4-5',
+          content: [{ type: 'text', text: 'done' }],
+          usage: { input_tokens: 900_000, output_tokens: 90_000 },
+        },
+      }),
+      JSON.stringify({
+        type: 'pr-link', sessionId: 'claude-leak-1', timestamp: '2026-07-18T12:00:20.000Z',
+        prUrl: 'https://github.com/getagentseal/codeburn/pull/1',
+      }),
+    ].join('\n') + '\n')
+    return filePath
+  }
+
+  it('does not surface cached claude sessions when filtering to another provider', async () => {
+    const synthFile = join(tmpHome, 'synth-isolation.txt')
+    await writeFile(synthFile, 'placeholder')
+    await writeClaudeSessionWithPrLink()
+
+    _synthSources = SYNTH_SOURCE(synthFile)
+    _synthYields = [SYNTH_CALL]
+
+    // Baseline: what the synthetic provider costs on its own, before anything
+    // claude-shaped has ever entered the session cache. Self-calibrating, since
+    // cost is re-derived from tokens by the pricing engine.
+    const baseline = await parseAllSessions(undefined, 'test-synthetic')
+    const synthOnlyCost = totalCost(baseline)
+    expect([...providersOf(baseline)]).toEqual(['test-synthetic'])
+    clearSessionCache()
+
+    // Warm the session cache so the claude file is persisted WITH its prLinks.
+    const all = await parseAllSessions(undefined, 'all')
+    expect(providersOf(all)).toContain('claude')
+    expect(totalCost(all)).toBeGreaterThan(synthOnlyCost)
+
+    clearSessionCache()
+
+    // Filtering to the synthetic provider must yield ONLY its own spend. Before
+    // the fix, claudeDirs was empty yet scanProjectDirs still ran, so every
+    // cached PR-bearing claude file was treated as a pruned orphan and re-added.
+    const filtered = await parseAllSessions(undefined, 'test-synthetic')
+
+    expect([...providersOf(filtered)]).toEqual(['test-synthetic'])
+    expect(totalCost(filtered)).toBeCloseTo(synthOnlyCost, 10)
+  })
+
+  it('still preserves a PR-bearing claude orphan when claude IS in scope', async () => {
+    const filePath = await writeClaudeSessionWithPrLink()
+    _synthSources = []
+    _synthYields = []
+
+    const before = await parseAllSessions(undefined, 'all')
+    const costBefore = totalCost(before)
+    expect(costBefore).toBeGreaterThan(0)
+
+    // Every claude transcript disappears from disk. Claude is still in scope, so
+    // the orphan pass must keep the PR-attributed spend alive — this is the case
+    // a naive `claudeDirs.length > 0` guard would silently break.
+    await unlink(filePath)
+    clearSessionCache()
+
+    const after = await parseAllSessions(undefined, 'all')
+    expect(totalCost(after)).toBeCloseTo(costBefore, 10)
+  })
+})