> ## Documentation Index > Fetch the complete documentation index at: https://docs.interchange.io/llms.txt > Use this file to discover all available pages before exploring further. # Library > The material, responses, and reusable slides your Merchandising Agent uses to sell your inventory. ## Overview The **Library** is everything you sell with, including the proposals you sent. It gives your storefront one place for media kits, decks, one-sheets, case studies, audience cards, spec sheets, seasonal calendars, and responses. [Product marketing](/v2/storefront/product-marketing/overview) becomes the Library: the Material and selling points you already keep there remain available here. This seller Library is not the advertiser creative library that buyers use for campaign creatives. Your Library contains seller Material, responses, and Library requests; it does not contain an advertiser's campaign creative. Before a proposal can use Library material, the selected wholesale product must also be complete: it needs a channel, a canonical URL-free format, and a priced option with currency and delivery type. Product pricing belongs in the product or rate-card flow, never in reusable Library material. If a proposal ends in `needs_clarification`, read the product's request-independent `composerCompleteness.missing` facts and repair them before retrying. The selected pricing option must also match the RFP currency. The Library is not where every seller record belongs. An RFP is a record of demand and stays in the [demand inbox](/v2/storefront/demand-inbox). Pricing lives in your rate cards. Policy lives in [AI Business Rules](/v2/setup/seller-pages#business-rules--what-you-accept). Since 2026-09-07, the Library is available to every seller. ## Responses and pairs A response can stand on its own in the Library, or it can be paired with the brief it answered. A **pair** holds that brief, the response, your commentary, and the commercial outcome recorded for the exchange. Use **Attach what we sent** on a demand-inbox row to file a response and create the pair without a separate linking step. Your grade and feedback are commentary on the pair. When you **endorse** a pair, you mark its response as a good answer to that brief. An endorsed pair is an evaluation case: rerun the brief and compare the result with the endorsed response. The outcome on the pair remains the record of what happened commercially. A response without a brief is standalone. It is a shape example, not an eval. The Library shows whether a response is paired or standalone. ## Reusable slides Uploaded decks, one-sheets, and spreadsheets yield reusable slides, pages, or sheets. Each starts as not reusable and can stay in the Library as a historical record without being available to add to a response. Only individual slides, pages, or sheets can be made reusable; a whole document or structural container cannot. Every reusable unit is checked for pricing. A unit with pricing is marked and cannot be made reusable until the figure is replaced with a rate-card value. Figures in reusable slides are layout, never prices: the value that renders comes from the rate card. This keeps a stale or buyer-specific number out of a response. When a reusable slide appears in a response, it is a Library block with its source named. You can turn Library blocks on or off and reorder them before sending. ## Add material Select **Add material** at the top of the Materials section in the Library to upload a PDF, PowerPoint (`.pptx`), Excel (`.xlsx`), CSV, PNG, JPEG, GIF, or WebP file. The Library checks the file type before it starts the private upload, then processes the new Material and shows its pages or slides here. A file type the Library cannot read is refused before it is uploaded. Uploaded decks and one-sheets show their reusable units after processing. A unit with pricing is marked and stays unavailable for reuse; clean units can be toggled reusable from the Library. ## How your agent uses the Library **Shaped by** is seller-facing provenance. On your Proposal Pass and the HTML, PDF, and PPTX previews you review, it names the endorsed example your agent followed from your own demand-inbox records, with its brief subject, pair id, endorsement date, and one sentence on why it fit. It is never included in what a buyer receives. If no endorsed pair fits, it says so and composes from Library material instead. Pairs are evidence from one buyer relationship. For a different buyer, the agent receives only the structure-only shape projection: its allowlisted block kinds, roles, and order. It does not receive the other buyer's name, contacts, brief, budget, negotiated rates, commentary, or response text. A pair follows its brief's retention. If the brief is deleted or a buyer asks for deletion, the pair and its shape projection stop shaping later responses. An earlier response keeps only a tombstone with the pair id and date, not its content. ## Library requests A **library request** records a gap the agent found while composing, such as a case study for a channel or vertical the Library does not cover. The response states the honest absence instead of inventing a block. **Add material** is the direct path when you have material to add. You can also drop a file into Murph chat, or close a specific Library request by uploading the missing file from that request. An uploaded file can provide reusable-slide candidates. Material you dictate to Murph is marked as your word rather than a document and feeds composed blocks; it does not become a slide. The request records which path closed it. ## Related Review demand, attach what you sent, and endorse a pair. Add Material and inspect its units.