bots.st/valem
valem
Compile and run deterministic reactive state models
2886 ms
answered our call
- State
- Answered
- Protocol
- MCP 2025-06-18
- Tools listed
- 35
- Answered
- 3 of the last 3 calls
How to reach it
- MCP, HTTP
https://valem.run/mcp
What it can do
| Tool | What it says it does |
|---|---|
convert_spreadsheet | Compile an uploaded .xlsx workbook's OWN formulas into a ready ModelSpec — deterministic transpilation (Excel formula language -> JSONata), never an LLM call: every number the compiled spec computes is checked to exactly match what the source workbook itself computed. One worksheet, one header-row… |
create_model | Create a new model from a declarative ModelSpec. The spec carries the JSON schema plus derivations (computed fields), constraints (invariants), and optional effects. Returns the created id. Fails (isError) on an invalid spec. If the requested id is already taken, a numeric postfix (-2, -3, …) is… |
delete_model | Remove a model from the registry. Fails (isError) if the model does not exist. |
download_blob | Fetch a blob's bytes by id, base64-encoded in the result. Pass 'modelId' to fetch a blob referenced by a specific model (access-scoped); omit it for a direct store fetch. Large blobs may exceed the result-size limit — this channel suits small binaries only. |
dry_run | Compile a candidate ModelSpec in an ISOLATED throwaway runtime, apply optional sample mutations, and return the resulting merged state (base + derived) — WITHOUT registering it in the live registry. Use this to preview the full reactive cascade of a draft spec. |
eval_expression | Evaluate a single JSONata expression against a sample input document and return the computed value, or the exact compile/eval error. Write the expr exactly as in a derivation/constraint 'expr': bare dot-paths, no leading $ (e.g. "loan.amount * loan.annualRate / 1200"). Use this to verify an… |
evolve_spec | Apply an incremental SpecEvolution diff to a model, preserving live state. Returns the new version. Fails (isError) if the evolved spec is invalid, if expectedVersion no longer matches, or if a schema change would strand existing state. Prefer targeted diffs (upsertSchemaNodes/upsertSchemaDefs… |
explain | Explain why a field is what it is: returns the recent derivation/constraint trace records for a path from the in-memory ring buffer (inputs, expression, result). For a constraint use the synthetic path "$constraint:<id>". Trace records can be bulky — pass 'limit' to return only the most recent N. |
explain_value | Explain how a value in a Valem card was computed: the formula, the values it read and the inputs it ultimately comes from, as Valem's engine has them for the given inputs. Use it when the user asks why a number is what it is. Pass the specHash and current inputs from the latest render_model result… |
get_audit | Query a model's durable, append-only audit trail (newest-first): one record per committed reactive cycle (mutations, derivedUpdated, traces, flaggedConstraints, dispatchedEffects, source, sequence). This is the queryable superset of get_history/explain — it survives the in-memory ring buffer… |
get_domain_guidance | Get vetted instructions for the hard modelling shapes this domain involves (progressive tax/fee charges, per-period schedules, classification, date math, group-by, …). Read the model description in ANY language, pick the matching topic ids, and call this BEFORE authoring the spec — then follow… |
get_effective_schema | Get the effective JSON Schema for a field: the static schema overlaid with LIVE meta-derived constraints (current min/max/required/…). Check this BEFORE writing a value to learn what the reactive pipeline will accept, instead of discovering an invalid mutation only by trying it and getting a… |
get_field | Get the value of a single field by its JSON Path address (e.g. "$.order.total"). Evaluates a LAZY derivation on demand. |
get_history | List the ISO-8601 timestamps of a model's committed mutations (most recent 100). |
get_library | List the JSONata functions and values a model's library exports — what an expression in this model may call, with signature, arity and originating layer. Call it before writing an expression so you reuse the model's existing vocabulary instead of re-deriving it. Returns null when the model… |
get_model_info | Get summary info for a model: id, version, and derivation/meta/constraint/effect counts. |
get_spec | Get the full stored ModelSpec JSON for a model. |
get_state | Get a model's merged state (base fields plus all computed derived fields). On a large model this is the biggest context cost — narrow it: pass 'paths' to project only specific subtrees (canonical addresses, each spliced back into a pruned document at its address), and/or 'depth' to cap nesting… |
get_view | Evaluate a model's embedded view definition against current state and return the resolved component tree. Pass an optional 'viewId' for a named view; omit for the default view. |
list_models | List the ids of all currently registered Valem models (alphabetical). |
mutate | Apply field mutations to a model and run the reactive pipeline (derivations recompute, constraints enforce, effects dispatch). 'mutations' is a flat map keyed by canonical JSON Path address, e.g. {"$.order.qty": 3}. A ROLLBACK constraint violation returns isError with the structured list of… |
pair_browser | Pair this MCP session with a browser tab on the hosted Valem sandbox so both drive the same live model session. Mints a pairing on first call (or resumes an existing not-yet-approved one) and waits up to a minute for the developer to approve it. Returns {status:"paired"|"already_paired"… |
patch_model | Apply an RFC 6902 JSON Patch document to a model and run the reactive pipeline. Unlike 'mutate' (a flat address→value map), a patch expresses array insert/remove/move and test/copy ops, e.g. [{"op":"add","path":"/order/items/-","value":{...}}, {"op":"remove","path":"/order/items/0"}]. 'path'… |
render_model | Show the user a Valem model as an interactive card they can edit in the chat: a form whose computed fields update on every change, checked by a deterministic engine. Use it when the user asks for a calculator, quote, budget, planner, pricing or any model with inputs and computed results. Write a… |
restore | Restore a model's state from a snapshot previously returned by 'snapshot' (pass it back verbatim as 'snapshot'). Overwrites the model's current base state. The snapshot must be for the same model. |
search_document | Deterministic, LLM-free search over an uploaded PDF/DOCX: ranks the document's pages/sections against your query (term-overlap, no embedding model, no network call) and returns the top matches with page/section citations and verbatim quotes. Cost is bounded by topK, never by document length — use… |
show_model | Show the user one of this server's models (created with create_model) as an interactive card in the chat. Every edit the user makes in the card is a mutate on the model, so get_state and explain see it. Use it after create_model or evolve_spec when the user should see or try the model. The model… |
snapshot | Capture an immutable point-in-time snapshot of a model's state (base document + derived/meta caches). A natural safety step before a risky evolve_spec: keep the returned snapshot and, if the change goes wrong, hand it back to 'restore' to roll the state back. |
test_spec | Run a spec's embedded test cases (or ad-hoc given->expect cases) through the real reactive pipeline in a throwaway runtime, returning pass/fail plus per-field failures (path, expected, actual). Use this to certify domain behavior before create_model / promotion. |
upload_blob | Store binary content (base64-encoded in 'data') in the content-addressed blob store and get back a BlobRef {$blobId, $mediaType, $bytes} to embed in a model's binary field. Storage is content-addressed (SHA-256), so uploading identical bytes returns the same $blobId. |
valem_card_edit | Called by the Valem card when the user edits a stored model. Not for direct use: call mutate instead. |
valem_recompute | Called by the Valem card when the user edits an input. Not for direct use: call render_model instead. |
valem_spec_guide | How to write a Valem ModelSpec that render_model accepts: sections, path notation, JSONata rules, view components and common mistakes. Call this once before writing your first spec in a conversation. |
validate_spec | Validate a ModelSpec WITHOUT creating it: returns a 'valid' flag plus structured findings (errors + warnings, each with a location and message). Use this to iterate on a draft — fix the reported errors, re-validate — before committing with create_model. |
verify_audit | Verify the tamper-evidence hash chain of a model's durable audit trail. Returns {valid, recordsChecked, firstBrokenSequence, detail}; a false 'valid' points at the first altered/reordered/deleted record. (Embedded mode has no hash chain and reports valid.) |
In its maker's words
Valem - Deterministic reactive state models. Create your own calculators/forms with AI
- Website
- valem.run
- Source
- github.com/vlad-public-code/org.json-kula.valem
- Publisher
- vlad-public-code
- Listed from
- the official MCP Registry as
io.github.vlad-public-code/valem - Version
- 1.0.0, updated 22 Aug 2026
- Kinds of work
- AI models and agent tools, Documents and files, Writing and translation
The domain it lives on
- valem.run
- registered 5 Aug 2026 (3 months ago), at NAMECHEAP INC, its home page is a working site
From our own crawl of domain names: registry records and the home page as our crawler last saw it.
Every call we made
| When | What happened | Time |
|---|---|---|
| Answered | 2886 ms | |
| Answered | 2550 ms | |
| Answered | 811 ms |
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