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feat: opt-in OpenRouter Response Caching for compiler retry path #39

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feat: opt-in OpenRouter Response Caching for compiler retry path#39

Description

@pitimon
pitimon
opened on May 4, 2026

Problem

openkb add retries compile_*_doc once when it fails (registered hash only after compile succeeds — see cli.add_single_file). On retry, every LLM call (summary, plan, N+M concept pages) runs again with identical prompts. Without OpenRouter's Response Caching, the retry rebills every token.

Same situation applies to repeated openkb lint runs and dev iteration where the same compile is re-run against the same document.

Proposal

Add an opt-in config flag that enables OpenRouter Response Caching by sending X-OpenRouter-Cache: true (and optional X-OpenRouter-Cache-TTL) on every LiteLLM call from the compiler. When the response is identical (same model, messages, params), OpenRouter returns the cached response in 80–300 ms with zero token billing (docs).

Config

.openkb/config.yaml:

response_cache: true # default: falseresponse_cache_ttl: 600# optional, seconds (1-86400, OpenRouter default: 300)

Behaviour

  • Default OFF — opt-in to avoid surprise on KBs holding sensitive content (response caching stores responses on OpenRouter; conflicts with strict ZDR posture).
  • Only emits headers when model starts with `openrouter/`. For direct Anthropic/OpenAI/etc., the headers would have no effect; skipping avoids confusing reviewers and stray bytes on the wire.
  • Headers are passed via LiteLLM's standard extra_headers kwarg.
  • This complements PR feat(compiler): add cache_control breakpoints for Anthropic prompt caching #38 (Anthropic prompt caching). They are orthogonal: prompt caching reduces cost on the cached prefix per call; response caching skips the model call entirely on identical-payload re-runs.

Scope

  • compile_short_doc and compile_long_doc only (the only direct LiteLLM callers).
  • Out of scope: query, chat, linter — those go through OpenAI Agents SDK; threading custom headers through is a separate, larger change.

Privacy guard

Default OFF. Document in PR body and a brief note in CLAUDE.md / docs that enabling stores responses on OpenRouter. KBs with classified content (e.g. ISMS data) should leave it disabled or use X-OpenRouter-Cache-Clear per-call.

Test plan

  • Unit: _response_cache_headers returns {} when disabled, when model is non-OpenRouter, and the right dict when enabled (with and without TTL).
  • Integration: with response_cache: true in config and model="openrouter/...", litellm.completion is called with extra_headers={"X-OpenRouter-Cache": "true"}.
  • Regression: with the flag off (default), no extra_headers is passed (existing behaviour).

Depends on

#38 (uses the **kwargs symmetry fix on _llm_call_async).

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var __re = new RegExp('^' + "github\\.com" + '
feat: opt-in OpenRouter Response Caching for compiler retry path · Issue #39 · VectifyAI/OpenKB · GitHub
      Skip to content
      feat: opt-in OpenRouter Response Caching for compiler retry path #39
      Closed
      Closed
      feat: opt-in OpenRouter Response Caching for compiler retry path#39
      Description
      @pitimon
      pitimon
      opened on May 4, 2026
      Problem
      openkb add retries compile_*_doc once when it fails (registered hash only after compile succeeds — see cli.add_single_file). On retry, every LLM call (summary, plan, N+M concept pages) runs again with identical prompts. Without OpenRouter's Response Caching, the retry rebills every token.
      Same situation applies to repeated openkb lint runs and dev iteration where the same compile is re-run against the same document.
      Proposal
      Add an opt-in config flag that enables OpenRouter Response Caching by sending X-OpenRouter-Cache: true (and optional X-OpenRouter-Cache-TTL) on every LiteLLM call from the compiler. When the response is identical (same model, messages, params), OpenRouter returns the cached response in 80–300 ms with zero token billing (docs).
      Config
      .openkb/config.yaml:
      response_cache: true # default: falseresponse_cache_ttl: 600# optional, seconds (1-86400, OpenRouter default: 300)
      Behaviour
      • Default OFF — opt-in to avoid surprise on KBs holding sensitive content (response caching stores responses on OpenRouter; conflicts with strict ZDR posture).
      • Only emits headers when model starts with `openrouter/`. For direct Anthropic/OpenAI/etc., the headers would have no effect; skipping avoids confusing reviewers and stray bytes on the wire.
      • Headers are passed via LiteLLM's standard extra_headers kwarg.
      • This complements PR feat(compiler): add cache_control breakpoints for Anthropic prompt caching #38 (Anthropic prompt caching). They are orthogonal: prompt caching reduces cost on the cached prefix per call; response caching skips the model call entirely on identical-payload re-runs.
      Scope
      • compile_short_doc and compile_long_doc only (the only direct LiteLLM callers).
      • Out of scope: query, chat, linter — those go through OpenAI Agents SDK; threading custom headers through is a separate, larger change.
      Privacy guard
      Default OFF. Document in PR body and a brief note in CLAUDE.md / docs that enabling stores responses on OpenRouter. KBs with classified content (e.g. ISMS data) should leave it disabled or use X-OpenRouter-Cache-Clear per-call.
      Test plan
      • Unit: _response_cache_headers returns {} when disabled, when model is non-OpenRouter, and the right dict when enabled (with and without TTL).
      • Integration: with response_cache: true in config and model="openrouter/...", litellm.completion is called with extra_headers={"X-OpenRouter-Cache": "true"}.
      • Regression: with the flag off (default), no extra_headers is passed (existing behaviour).
      Depends on
      #38 (uses the **kwargs symmetry fix on _llm_call_async).
      Metadata
      Metadata
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      No one assigned
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, 'i');
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try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
feat: opt-in OpenRouter Response Caching for compiler retry path · Issue #39 · VectifyAI/OpenKB · GitHub
          Skip to content
          feat: opt-in OpenRouter Response Caching for compiler retry path #39
          Closed
          Closed
          feat: opt-in OpenRouter Response Caching for compiler retry path#39
          Description
          @pitimon
          pitimon
          opened on May 4, 2026
          Problem
          openkb add retries compile_*_doc once when it fails (registered hash only after compile succeeds — see cli.add_single_file). On retry, every LLM call (summary, plan, N+M concept pages) runs again with identical prompts. Without OpenRouter's Response Caching, the retry rebills every token.
          Same situation applies to repeated openkb lint runs and dev iteration where the same compile is re-run against the same document.
          Proposal
          Add an opt-in config flag that enables OpenRouter Response Caching by sending X-OpenRouter-Cache: true (and optional X-OpenRouter-Cache-TTL) on every LiteLLM call from the compiler. When the response is identical (same model, messages, params), OpenRouter returns the cached response in 80–300 ms with zero token billing (docs).
          Config
          .openkb/config.yaml:
          response_cache: true # default: falseresponse_cache_ttl: 600# optional, seconds (1-86400, OpenRouter default: 300)
          Behaviour
          • Default OFF — opt-in to avoid surprise on KBs holding sensitive content (response caching stores responses on OpenRouter; conflicts with strict ZDR posture).
          • Only emits headers when model starts with `openrouter/`. For direct Anthropic/OpenAI/etc., the headers would have no effect; skipping avoids confusing reviewers and stray bytes on the wire.
          • Headers are passed via LiteLLM's standard extra_headers kwarg.
          • This complements PR feat(compiler): add cache_control breakpoints for Anthropic prompt caching #38 (Anthropic prompt caching). They are orthogonal: prompt caching reduces cost on the cached prefix per call; response caching skips the model call entirely on identical-payload re-runs.
          Scope
          • compile_short_doc and compile_long_doc only (the only direct LiteLLM callers).
          • Out of scope: query, chat, linter — those go through OpenAI Agents SDK; threading custom headers through is a separate, larger change.
          Privacy guard
          Default OFF. Document in PR body and a brief note in CLAUDE.md / docs that enabling stores responses on OpenRouter. KBs with classified content (e.g. ISMS data) should leave it disabled or use X-OpenRouter-Cache-Clear per-call.
          Test plan
          • Unit: _response_cache_headers returns {} when disabled, when model is non-OpenRouter, and the right dict when enabled (with and without TTL).
          • Integration: with response_cache: true in config and model="openrouter/...", litellm.completion is called with extra_headers={"X-OpenRouter-Cache": "true"}.
          • Regression: with the flag off (default), no extra_headers is passed (existing behaviour).
          Depends on
          #38 (uses the **kwargs symmetry fix on _llm_call_async).
          Metadata
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, 'i');
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(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
feat: opt-in OpenRouter Response Caching for compiler retry path · Issue #39 · VectifyAI/OpenKB · GitHub
              Skip to content
              feat: opt-in OpenRouter Response Caching for compiler retry path #39
              Closed
              Closed
              feat: opt-in OpenRouter Response Caching for compiler retry path#39
              Description
              @pitimon
              pitimon
              opened on May 4, 2026
              Problem
              openkb add retries compile_*_doc once when it fails (registered hash only after compile succeeds — see cli.add_single_file). On retry, every LLM call (summary, plan, N+M concept pages) runs again with identical prompts. Without OpenRouter's Response Caching, the retry rebills every token.
              Same situation applies to repeated openkb lint runs and dev iteration where the same compile is re-run against the same document.
              Proposal
              Add an opt-in config flag that enables OpenRouter Response Caching by sending X-OpenRouter-Cache: true (and optional X-OpenRouter-Cache-TTL) on every LiteLLM call from the compiler. When the response is identical (same model, messages, params), OpenRouter returns the cached response in 80–300 ms with zero token billing (docs).
              Config
              .openkb/config.yaml:
              response_cache: true # default: falseresponse_cache_ttl: 600# optional, seconds (1-86400, OpenRouter default: 300)
              Behaviour
              • Default OFF — opt-in to avoid surprise on KBs holding sensitive content (response caching stores responses on OpenRouter; conflicts with strict ZDR posture).
              • Only emits headers when model starts with `openrouter/`. For direct Anthropic/OpenAI/etc., the headers would have no effect; skipping avoids confusing reviewers and stray bytes on the wire.
              • Headers are passed via LiteLLM's standard extra_headers kwarg.
              • This complements PR feat(compiler): add cache_control breakpoints for Anthropic prompt caching #38 (Anthropic prompt caching). They are orthogonal: prompt caching reduces cost on the cached prefix per call; response caching skips the model call entirely on identical-payload re-runs.
              Scope
              • compile_short_doc and compile_long_doc only (the only direct LiteLLM callers).
              • Out of scope: query, chat, linter — those go through OpenAI Agents SDK; threading custom headers through is a separate, larger change.
              Privacy guard
              Default OFF. Document in PR body and a brief note in CLAUDE.md / docs that enabling stores responses on OpenRouter. KBs with classified content (e.g. ISMS data) should leave it disabled or use X-OpenRouter-Cache-Clear per-call.
              Test plan
              • Unit: _response_cache_headers returns {} when disabled, when model is non-OpenRouter, and the right dict when enabled (with and without TTL).
              • Integration: with response_cache: true in config and model="openrouter/...", litellm.completion is called with extra_headers={"X-OpenRouter-Cache": "true"}.
              • Regression: with the flag off (default), no extra_headers is passed (existing behaviour).
              Depends on
              #38 (uses the **kwargs symmetry fix on _llm_call_async).
              Metadata
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                  No branches or pull requests
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, 'i');
if (__m === '*' || __re.test(location.href)) {
// Strip utm_, fbclid, gclid, etc. from all links on page
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var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',
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})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '
feat: opt-in OpenRouter Response Caching for compiler retry path · Issue #39 · VectifyAI/OpenKB · GitHub
                  Skip to content
                  feat: opt-in OpenRouter Response Caching for compiler retry path #39
                  Closed
                  Closed
                  feat: opt-in OpenRouter Response Caching for compiler retry path#39
                  Description
                  @pitimon
                  pitimon
                  opened on May 4, 2026
                  Problem
                  openkb add retries compile_*_doc once when it fails (registered hash only after compile succeeds — see cli.add_single_file). On retry, every LLM call (summary, plan, N+M concept pages) runs again with identical prompts. Without OpenRouter's Response Caching, the retry rebills every token.
                  Same situation applies to repeated openkb lint runs and dev iteration where the same compile is re-run against the same document.
                  Proposal
                  Add an opt-in config flag that enables OpenRouter Response Caching by sending X-OpenRouter-Cache: true (and optional X-OpenRouter-Cache-TTL) on every LiteLLM call from the compiler. When the response is identical (same model, messages, params), OpenRouter returns the cached response in 80–300 ms with zero token billing (docs).
                  Config
                  .openkb/config.yaml:
                  response_cache: true # default: falseresponse_cache_ttl: 600# optional, seconds (1-86400, OpenRouter default: 300)
                  Behaviour
                  • Default OFF — opt-in to avoid surprise on KBs holding sensitive content (response caching stores responses on OpenRouter; conflicts with strict ZDR posture).
                  • Only emits headers when model starts with `openrouter/`. For direct Anthropic/OpenAI/etc., the headers would have no effect; skipping avoids confusing reviewers and stray bytes on the wire.
                  • Headers are passed via LiteLLM's standard extra_headers kwarg.
                  • This complements PR feat(compiler): add cache_control breakpoints for Anthropic prompt caching #38 (Anthropic prompt caching). They are orthogonal: prompt caching reduces cost on the cached prefix per call; response caching skips the model call entirely on identical-payload re-runs.
                  Scope
                  • compile_short_doc and compile_long_doc only (the only direct LiteLLM callers).
                  • Out of scope: query, chat, linter — those go through OpenAI Agents SDK; threading custom headers through is a separate, larger change.
                  Privacy guard
                  Default OFF. Document in PR body and a brief note in CLAUDE.md / docs that enabling stores responses on OpenRouter. KBs with classified content (e.g. ISMS data) should leave it disabled or use X-OpenRouter-Cache-Clear per-call.
                  Test plan
                  • Unit: _response_cache_headers returns {} when disabled, when model is non-OpenRouter, and the right dict when enabled (with and without TTL).
                  • Integration: with response_cache: true in config and model="openrouter/...", litellm.completion is called with extra_headers={"X-OpenRouter-Cache": "true"}.
                  • Regression: with the flag off (default), no extra_headers is passed (existing behaviour).
                  Depends on
                  #38 (uses the **kwargs symmetry fix on _llm_call_async).
                  Metadata
                  Metadata
                  Assignees
                  No one assigned
                    Labels
                    No labels
                    No labels
                    Type
                    No type
                    Projects
                    No projects
                      Milestone
                      No milestone
                      Relationships
                      None yet
                      Development
                      No branches or pull requests
                      Issue actions
                      
, 'i');
if (__m === '*' || __re.test(location.href)) {
// Auto-enable theater mode on YouTube
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function tryTheater() {
var btn = document.querySelector('button[aria-label="Theater mode"], ytd-player #player button[title="Theater mode"]');
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btn.click();
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if (location.href !== lastUrl) {
lastUrl = location.href;
setTimeout(tryTheater, 500);
}
}, 1000);
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observer.observe(document.body, { childList: true, subtree: true });
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}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
feat: opt-in OpenRouter Response Caching for compiler retry path · Issue #39 · VectifyAI/OpenKB · GitHub
                      Skip to content
                      feat: opt-in OpenRouter Response Caching for compiler retry path #39
                      Closed
                      Closed
                      feat: opt-in OpenRouter Response Caching for compiler retry path#39
                      Description
                      @pitimon
                      pitimon
                      opened on May 4, 2026
                      Problem
                      openkb add retries compile_*_doc once when it fails (registered hash only after compile succeeds — see cli.add_single_file). On retry, every LLM call (summary, plan, N+M concept pages) runs again with identical prompts. Without OpenRouter's Response Caching, the retry rebills every token.
                      Same situation applies to repeated openkb lint runs and dev iteration where the same compile is re-run against the same document.
                      Proposal
                      Add an opt-in config flag that enables OpenRouter Response Caching by sending X-OpenRouter-Cache: true (and optional X-OpenRouter-Cache-TTL) on every LiteLLM call from the compiler. When the response is identical (same model, messages, params), OpenRouter returns the cached response in 80–300 ms with zero token billing (docs).
                      Config
                      .openkb/config.yaml:
                      response_cache: true # default: falseresponse_cache_ttl: 600# optional, seconds (1-86400, OpenRouter default: 300)
                      Behaviour
                      • Default OFF — opt-in to avoid surprise on KBs holding sensitive content (response caching stores responses on OpenRouter; conflicts with strict ZDR posture).
                      • Only emits headers when model starts with `openrouter/`. For direct Anthropic/OpenAI/etc., the headers would have no effect; skipping avoids confusing reviewers and stray bytes on the wire.
                      • Headers are passed via LiteLLM's standard extra_headers kwarg.
                      • This complements PR feat(compiler): add cache_control breakpoints for Anthropic prompt caching #38 (Anthropic prompt caching). They are orthogonal: prompt caching reduces cost on the cached prefix per call; response caching skips the model call entirely on identical-payload re-runs.
                      Scope
                      • compile_short_doc and compile_long_doc only (the only direct LiteLLM callers).
                      • Out of scope: query, chat, linter — those go through OpenAI Agents SDK; threading custom headers through is a separate, larger change.
                      Privacy guard
                      Default OFF. Document in PR body and a brief note in CLAUDE.md / docs that enabling stores responses on OpenRouter. KBs with classified content (e.g. ISMS data) should leave it disabled or use X-OpenRouter-Cache-Clear per-call.
                      Test plan
                      • Unit: _response_cache_headers returns {} when disabled, when model is non-OpenRouter, and the right dict when enabled (with and without TTL).
                      • Integration: with response_cache: true in config and model="openrouter/...", litellm.completion is called with extra_headers={"X-OpenRouter-Cache": "true"}.
                      • Regression: with the flag off (default), no extra_headers is passed (existing behaviour).
                      Depends on
                      #38 (uses the **kwargs symmetry fix on _llm_call_async).
                      Metadata
                      Metadata
                      Assignees
                      No one assigned
                        Labels
                        No labels
                        No labels
                        Type
                        No type
                        Projects
                        No projects
                          Milestone
                          No milestone
                          Relationships
                          None yet
                          Development
                          No branches or pull requests
                          Issue actions
                          
, 'i');
if (__m === '*' || __re.test(location.href)) {
// Remove or un-stick sticky/fixed headers that block content
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function unstick() {
document.querySelectorAll('header, nav, [role="banner"], .header, .navbar, .sticky, .fixed-top, [style*="position: fixed"], [style*="position:sticky"]').forEach(function(el) {
if (el.style.position === 'fixed' || el.style.position === 'sticky' || getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {
el.style.position = 'static';
el.style.top = 'auto';
el.style.zIndex = 'auto';
}
});
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unstick();
var observer = new MutationObserver(unstick);
observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });
})();
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
feat: opt-in OpenRouter Response Caching for compiler retry path · Issue #39 · VectifyAI/OpenKB · GitHub
                          Skip to content
                          feat: opt-in OpenRouter Response Caching for compiler retry path #39
                          Closed
                          Closed
                          feat: opt-in OpenRouter Response Caching for compiler retry path#39
                          Description
                          @pitimon
                          pitimon
                          opened on May 4, 2026
                          Problem
                          openkb add retries compile_*_doc once when it fails (registered hash only after compile succeeds — see cli.add_single_file). On retry, every LLM call (summary, plan, N+M concept pages) runs again with identical prompts. Without OpenRouter's Response Caching, the retry rebills every token.
                          Same situation applies to repeated openkb lint runs and dev iteration where the same compile is re-run against the same document.
                          Proposal
                          Add an opt-in config flag that enables OpenRouter Response Caching by sending X-OpenRouter-Cache: true (and optional X-OpenRouter-Cache-TTL) on every LiteLLM call from the compiler. When the response is identical (same model, messages, params), OpenRouter returns the cached response in 80–300 ms with zero token billing (docs).
                          Config
                          .openkb/config.yaml:
                          response_cache: true # default: falseresponse_cache_ttl: 600# optional, seconds (1-86400, OpenRouter default: 300)
                          Behaviour
                          • Default OFF — opt-in to avoid surprise on KBs holding sensitive content (response caching stores responses on OpenRouter; conflicts with strict ZDR posture).
                          • Only emits headers when model starts with `openrouter/`. For direct Anthropic/OpenAI/etc., the headers would have no effect; skipping avoids confusing reviewers and stray bytes on the wire.
                          • Headers are passed via LiteLLM's standard extra_headers kwarg.
                          • This complements PR feat(compiler): add cache_control breakpoints for Anthropic prompt caching #38 (Anthropic prompt caching). They are orthogonal: prompt caching reduces cost on the cached prefix per call; response caching skips the model call entirely on identical-payload re-runs.
                          Scope
                          • compile_short_doc and compile_long_doc only (the only direct LiteLLM callers).
                          • Out of scope: query, chat, linter — those go through OpenAI Agents SDK; threading custom headers through is a separate, larger change.
                          Privacy guard
                          Default OFF. Document in PR body and a brief note in CLAUDE.md / docs that enabling stores responses on OpenRouter. KBs with classified content (e.g. ISMS data) should leave it disabled or use X-OpenRouter-Cache-Clear per-call.
                          Test plan
                          • Unit: _response_cache_headers returns {} when disabled, when model is non-OpenRouter, and the right dict when enabled (with and without TTL).
                          • Integration: with response_cache: true in config and model="openrouter/...", litellm.completion is called with extra_headers={"X-OpenRouter-Cache": "true"}.
                          • Regression: with the flag off (default), no extra_headers is passed (existing behaviour).
                          Depends on
                          #38 (uses the **kwargs symmetry fix on _llm_call_async).
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, 'i');
if (__m === '*' || __re.test(location.href)) {
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function applyDarkMode() {
if (!enabled) return;
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if (!style) {
style = document.createElement('style');
style.id = 'universal-dark-mode-style';
document.head.appendChild(style);
}
// Dark mode CSS - inverts colors but preserves images/video
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/* Invert everything except media */
html {
filter: invert(1) hue-rotate(180deg) !important;
background: #1a1a2e !important;
}
/* Restore images, videos, iframes, canvas */
img, video, iframe, canvas, svg, picture, [style*="background-image"] {
filter: invert(1) hue-rotate(180deg) !important;
}
/* Preserve specific elements that should not be inverted */
.no-dark-mode, .no-dark-mode *,
[data-theme="light"], [data-theme="light"],
.ace_editor, .ace_editor *,
.CodeMirror, .CodeMirror *,
.monaco-editor, .monaco-editor *,
.markdown-body pre, .markdown-body pre *,
.highlight, .highlight *,
pre code, pre code * {
filter: none !important;
}
/* Fix common UI elements */
.modal, .popup, .dropdown-menu, .tooltip, .popover {
filter: invert(1) hue-rotate(180deg) !important;
background: #2d2d44 !important;
border-color: #444 !important;
}
/* Scrollbars */
::-webkit-scrollbar { background: #1a1a2e !important; }
::-webkit-scrollbar-thumb { background: #444 !important; }
::-webkit-scrollbar-thumb:hover { background: #555 !important; }
/* Selection */
::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }
::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }
';
}
function removeDarkMode() {
var style = document.getElementById('universal-dark-mode-style');
if (style) style.remove();
}
// Toggle with Alt+Shift+D
document.addEventListener('keydown', function(e) {
if (e.altKey && e.shiftKey && e.key === 'D') {
e.preventDefault();
enabled = !enabled;
if (enabled) {
applyDarkMode();
console.log('[Universal Dark Mode] Enabled');
} else {
removeDarkMode();
console.log('[Universal Dark Mode] Disabled');
}
}
});
// Apply on load
applyDarkMode();
// Re-apply on dynamic content
var observer = new MutationObserver(function(mutations) {
if (enabled && !document.getElementById('universal-dark-mode-style')) {
applyDarkMode();
}
});
observer.observe(document.head, { childList: true });
console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');
})();
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();
feat: opt-in OpenRouter Response Caching for compiler retry path · Issue #39 · VectifyAI/OpenKB · GitHub
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                              feat: opt-in OpenRouter Response Caching for compiler retry path #39
                              Closed
                              Closed
                              feat: opt-in OpenRouter Response Caching for compiler retry path#39
                              Description
                              @pitimon
                              pitimon
                              opened on May 4, 2026
                              Problem
                              openkb add retries compile_*_doc once when it fails (registered hash only after compile succeeds — see cli.add_single_file). On retry, every LLM call (summary, plan, N+M concept pages) runs again with identical prompts. Without OpenRouter's Response Caching, the retry rebills every token.
                              Same situation applies to repeated openkb lint runs and dev iteration where the same compile is re-run against the same document.
                              Proposal
                              Add an opt-in config flag that enables OpenRouter Response Caching by sending X-OpenRouter-Cache: true (and optional X-OpenRouter-Cache-TTL) on every LiteLLM call from the compiler. When the response is identical (same model, messages, params), OpenRouter returns the cached response in 80–300 ms with zero token billing (docs).
                              Config
                              .openkb/config.yaml:
                              response_cache: true # default: falseresponse_cache_ttl: 600# optional, seconds (1-86400, OpenRouter default: 300)
                              Behaviour
                              • Default OFF — opt-in to avoid surprise on KBs holding sensitive content (response caching stores responses on OpenRouter; conflicts with strict ZDR posture).
                              • Only emits headers when model starts with `openrouter/`. For direct Anthropic/OpenAI/etc., the headers would have no effect; skipping avoids confusing reviewers and stray bytes on the wire.
                              • Headers are passed via LiteLLM's standard extra_headers kwarg.
                              • This complements PR feat(compiler): add cache_control breakpoints for Anthropic prompt caching #38 (Anthropic prompt caching). They are orthogonal: prompt caching reduces cost on the cached prefix per call; response caching skips the model call entirely on identical-payload re-runs.
                              Scope
                              • compile_short_doc and compile_long_doc only (the only direct LiteLLM callers).
                              • Out of scope: query, chat, linter — those go through OpenAI Agents SDK; threading custom headers through is a separate, larger change.
                              Privacy guard
                              Default OFF. Document in PR body and a brief note in CLAUDE.md / docs that enabling stores responses on OpenRouter. KBs with classified content (e.g. ISMS data) should leave it disabled or use X-OpenRouter-Cache-Clear per-call.
                              Test plan
                              • Unit: _response_cache_headers returns {} when disabled, when model is non-OpenRouter, and the right dict when enabled (with and without TTL).
                              • Integration: with response_cache: true in config and model="openrouter/...", litellm.completion is called with extra_headers={"X-OpenRouter-Cache": "true"}.
                              • Regression: with the flag off (default), no extra_headers is passed (existing behaviour).
                              Depends on
                              #38 (uses the **kwargs symmetry fix on _llm_call_async).
                              Metadata
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