Ceramic glaze chemistry: unity formulas, limit checks, substitutes, cones and potters' guides.
Connect Remote server
claude mcp add --transport http glazecalc https://glazecalcapp.com/mcp --header "Authorization: Bearer <YOUR_API_KEY>"{
"mcpServers": {
"glazecalc": {
"url": "https://glazecalcapp.com/mcp",
"headers": {
"Authorization": "Bearer <YOUR_API_KEY>"
}
}
}
}{
"servers": {
"glazecalc": {
"type": "http",
"url": "https://glazecalcapp.com/mcp",
"headers": {
"Authorization": "Bearer <YOUR_API_KEY>"
}
}
}
}Settings > Connectors > Add custom connector
URL: https://glazecalcapp.com/mcpReplace the values in angle brackets with your own. Keys stay on your machine; we never see them.
Tools 34 found in our last check
search_materialsFinds ceramic raw materials (feldspars, clays, frits, fluxes) and, if asked, colorants in Glazecalc's library by name, alias or maker. Use it to find the exact name the other tools take.
get_materialOne material from Glazecalc's library: its oxides, loss on ignition, whether it is discontinued and what replaces it, where it is sold, hazards and the data sheet it comes from.
analyze_recipeWorks out a glaze recipe's unity (Seger) formula, oxide groups, silica to alumina ratio, fired analysis, loss on ignition and calculated thermal expansion, as the Glazecalc app does. stull says where the recipe sits on Stull's chart (1912, as the recipe page draws it): silica an…
check_limitsChecks a glaze recipe for what is past a recommended limit for its firing (too much boron or alkali, too little alumina, too little or too much clay, rising expansion...) and says what the fired glaze will likely do, as the Glazecalc app does. A cone is checked in the band the r…
convert_cone_temperatureConverts between a pyrometric cone and its temperature, and between °C and °F. Orton cones run 022 to 42: Glazecalc's figure, from 022 to 15, is Orton's older chart for large cones at 150 °C an hour, and Orton's current figures (self-supporting cones at 15, 60 and 150 °C an hour…
specific_gravity_waterWorks out a glaze slurry's specific gravity (SG) from the grams 100 mL of it weighs (or takes the SG), then, for a bucket of it and a target SG, the water to add, or to pour off after the glaze settles, as the recipe page's Specific gravity and water does. The water to add needs…
suggest_substitutesFinds the discontinued or scarce materials in a recipe and the modern ones that replace them, then suggests amounts that keep the unity formula as near as the materials allow, as the Glazecalc app does. report.closeness says how near the new unity formula comes to the old, oxide…
match_from_materialsRemakes a glaze recipe from only the materials listed in "have", keeping its unity formula as near as they allow, as Match with what I have does in the Glazecalc app. report.closeness says how near the new unity formula comes to the old, oxide by oxide: close (within 0.02, or 5%…
solve_targetMakes a glaze recipe, in percent, from the materials given whose unity formula comes as near a target as they allow (Solve for a target in the Glazecalc app). The target is a unity formula (moles; the fluxes are scaled to add up to 1) or an oxide analysis (percent by weight of t…
blend_recipesWorks out the test tiles of a line blend between recipes a and b (2 to 11 steps), or of a triaxial blend when c is given too (2 to 6 rows, up to 21 tiles), as the Blends page of the Glazecalc app does. Each tile is a mix of the corner recipes, each taken as a percent of its base…
vary_materialShows what one material does to a glaze, by putting more and more of it into a base recipe (an ingredient blend or progression test: whiting 0 to 20, say, in 2 to 11 tiles). With mode "add" (the default) it goes on top of the base, so the recipe grows; with mode "replace" the sa…
compare_recipesCompares two glaze recipes side by side: for each, its recipe in percent, key unity formula figures, flux ratio (R2O against RO), silica to alumina, calculated expansion, place on Stull's chart (stull), the names of the limit cautions it has and, with a firing, whether its chemi…
search_guidesSearches Glazecalc's plain-language guides for potters (glazing from first principles, making a glaze, safe mixing, safety at home with children and pets, firing a kiln, and a companion to John Britt's free glaze course, in English only) in the language asked for, or in English…
list_recipesLists the glaze recipes saved in your Glazecalc account, newest first, optionally only those whose title or a material matches a search, or whose stated firing includes a cone or names an atmosphere or process ("which of my glazes fire at cone 10 reduction?"). Each lists its sta…
get_recipeOne recipe from your account: its materials and amounts, colorants, notes, its stated firing (firedAt: the cone scale, the low and optional high cone of the claimed range, the cones the potter has test-fired, left out when none is ticked, because a stated cone from a book is not…
list_my_materialsLists the materials you have saved in your own Glazecalc account (not the shared library), with their oxides.
get_shelfThe materials you marked as on hand in Glazecalc (the shelf that Match with what I have uses).
match_with_what_i_haveRemakes one of your recipes, or a recipe you give, from only the materials on your shelf, keeping its unity formula as near as they allow (Match with what I have). report.closeness says how near the new unity formula comes to the old, oxide by oxide, as match_from_materials does…
list_firingsLists the firing logs saved in your Glazecalc account, newest first.
get_firingOne firing log from your account: its columns (time, temperature, cone...) and rows, and its notes.
list_notesThe notes in your Glazecalc notebook, newest first, optionally only those about one record (a recipe, material or firing log id).
get_my_settingsYour Glazecalc settings that matter when talking about glazes: region, temperature scale, cones, language, weight unit, whether lead may be suggested, the limit set recipes are checked against, the currency your prices are in (never the prices), and whether changes made by assis…
create_recipeSaves a new glaze recipe in your Glazecalc account, from its base materials and amounts (the library's names, or your own materials'), with optional colorants, notes, firing band and food-surface mark. Glazecalc works out its unity formula, as the recipe page does, and answers w…
update_recipeChanges one of your saved recipes (an id from list_recipes): its title, its base materials and amounts (the unity formula is worked out again), its notes, firing band or food-surface mark. Only what is given changes. The recipe as it was is kept as an earlier version, so the per…
add_notebook_entryAdds an entry to your Glazecalc notebook (the Notebook page), with an optional title: a test result, an observation, a firing to try. With about, it is a note about one of your recipes, materials or firing logs, which list_notes finds by that record's id. Needs an access token t…
add_my_materialSaves a material of your own in your Glazecalc account (the Materials page) from its oxide analysis in weight percent, as on a data sheet, with its loss on ignition. Recipes can then use it by name. Needs an access token that can read and change your records.
update_my_materialChanges one of your own materials (an id from list_my_materials): its name, oxide analysis in weight percent, loss on ignition or notes. Only what is given changes. Recipes already saved keep their own copy of it. The material as it was is kept as an earlier version, so the pers…
add_to_shelfMarks materials as on hand (the shelf that Match with what I have uses), by the library's names or your own materials'. The shelf as it was is kept: undo_shelf_change puts it back. Needs an access token that can read and change your records.
remove_from_shelfTakes materials off the shelf of materials on hand, by name. The materials themselves stay. The shelf as it was is kept: undo_shelf_change puts it back. Needs an access token that can read and change your records.
undo_shelf_changePuts back the shelf as it was before its last change (by the website, an access token or an assistant). One step back only: a second call finds nothing to undo until the shelf changes again. Needs an access token that can read and change your records.
move_to_trashMoves one of your recipes, materials, notebook entries or firing logs to the Trash, as removing it on the website does. It can be put back from the Trash on the website for 30 days; nothing is deleted for good. A token moves at most 100 an hour, and none while the Trash is full.…
create_firing_logSaves a new firing log in your Glazecalc account (the Firing page): its title, the day, the kiln, the columns kept (time, temperature, cone, atmosphere, comments...) and a row for each reading, as the person dictated them. Add later readings with add_firing_rows. Save only what…
add_firing_rowsAdds rows to the end of one of your firing logs (an id from list_firings), in the log's own columns (get_firing gives them): the readings dictated during a firing. The rows already there stay as they are, and the log as it was is kept as an earlier version. At most 500 rows a lo…
link_firingLinks one of your recipes to a firing log it went through, as the recipe page does, and sets what came of it there: the result in the person's words (at most 500 characters), and the cone and atmosphere when they differ from the log. Linked already, it changes only what is given…
Headers
| Name | Description |
|---|---|
AuthorizationOptional, secret | Only for your own saved records, and only if your app does not connect through Glazecalc sign-in: "Bearer " and a personal access token made on your Glazecalc account page, read only or read and change. The public tools need none. |
Details
| Endpoint | https://glazecalcapp.com/mcp (Streamable HTTP) |
| First published | 3 Nov 2026 |
| Last updated | 3 Nov 2026 |
| Registry name | com.glazecalcapp/glazecalc |
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