The MCP endpoint

POST /mcp is a Model Context Protocol endpoint. An agent signs in with OAuth and calls tools that create documents, revise them, and read back what humans said. A long-form plan then gets considered review instead of scrolling past in a terminal.

Set up with one prompt

A coding agent can do the whole setup for you. A project’s Connect page and the first-run wizard at /welcome/connect show a short prompt with a Copy button. Paste it into Claude Code or Codex, in the repository of the project:

Set up Loupe for this repository. Run
curl -fsSL "https://loupe.example.com/setup.md?project=<project id>"
and follow the steps it prints, in order. Use curl, not a web fetch tool.

/setup.md is public and returns Markdown steps for an agent. The steps install the CLI with /install.sh when loupe version fails, and stop on Windows, which has no build. They sign in with loupe login and bind the repository with loupe init. Then they connect the MCP server, install the skills, and check the result with loupe status. When your rule file holds worker entries under work:, the steps then ask whether each bridge worker gets its own folder. If it does, the agent adds a before command to those entries, and a teardown entry. The agent asks you when a step needs you, such as the browser approval of the sign-in. It never writes a token or a password.

The project parameter fills the project id into the commands. The page accepts only a UUID and ignores any other value. With no valid id, the steps run loupe init and ask you which project to use.

The two agents differ in two steps:

Step	Claude Code	Codex
MCP server	loupe init --mcp declares loupe mcp at user scope	codex mcp add loupe -- loupe mcp --project <project id>
Skills	The Claude Code plugin, see below	A copy of plugins/loupe/skills/ in ~/.agents/skills/

Codex gets the project id in its server declaration, and Claude Code reads it from .loupe.yaml. At the end, the agent tells you to restart it. The new session then calls project_current and names the project.

The prompt asks for curl because a web fetch tool can return a summary of the page instead of the page. An agent that follows a summary can skip a step or change a command.

Connecting through the CLI

This is the way to connect, and the setup prompt above does it for you. One sign-in serves every repository, and each repository names its own project, so a new project needs no new login.

loupe mcp connects an agent to this endpoint with no token in any file. The CLI already holds a login, so the command signs each request with it, and the project comes from the repository rather than from the credential.

Install the CLI, sign in once, and name the project in each repository:

curl -fsSL https://<your Loupe>/install.sh | sh
# or, with Homebrew: brew install ubermuda/tap/loupe
loupe login                  # a browser sign-in, once per machine
cd ~/code/my-project
loupe init                   # writes .loupe.yaml, choosing from your projects

loupe init then checks how Claude Code starts the loupe server. When nothing does, it offers to declare it for every project:

claude mcp add --scope user loupe -- loupe mcp

One declaration serves every repository. Claude Code starts the command with the repository as its working directory, and loupe mcp reads .loupe.yaml from there, so the project comes from the repository rather than from the declaration. A worktree gets it for free. A repository with no .loupe.yaml still starts the server, with no project: your login then acts on your single project, or refuses and asks which one when you own several. The refusal names loupe init as the fix.

loupe mcp reads .loupe.yaml again when the file changes, so a new project reaches the agent at its next request. A file that fails to parse keeps the last good project. A removed file sends no project, as if the repository had no file. Each change writes one line to stderr, which an agent shows as this server’s log. With --project, the command never reads the file.

When something else already answers to the name, loupe init says what it starts and offers to remove it. Removing always asks, whatever flags you passed, so a script never drops a declaration you made by hand. --mcp and --no-mcp answer the create offer without being asked.

loupe init never edits Claude Code’s configuration file. Claude Code owns it, rewrites it while it runs, and keeps its own backups beside it, so every change runs claude mcp and lets Claude Code edit its own file.

Committing the server to the repository

loupe init --mcp-json writes .mcp.json instead, so everyone who clones the repository gets the server:

{
  "mcpServers": {
    "loupe": { "command": "loupe", "args": ["mcp"] }
  }
}

Every other server in that file is kept, and so is every other top-level key. The file holds no credential, so committing it is safe. .loupe.yaml holds the project id, which is not a secret either.

Two things come with it. An agent asks you to approve the server the first time, because the file names programs to run and travels with the repository. And .mcp.json is the lowest of Claude Code’s three scopes, so a local or user declaration of the same name hides it. loupe init reports that rather than leaving you to find it.

The command adds one thing a direct HTTP connection cannot. Loupe keeps each MCP session for an hour in one web container’s cache directory, so a session ends on an idle agent, on a deploy, and on a request that reaches another container. loupe mcp then opens a new session and carries on, where a direct connection loses its Loupe tools for the rest of the agent’s run. It also waits and tries again when Loupe answers with a rate limit or a short outage during a deploy, and it gives the agent an error for that one call when the wait ends.

One sign-in is enough. loupe login asks for agent mcp projects, so the same login serves loupe bridge and loupe mcp, and it covers every project you own including ones you create later. The approval page says so before you allow it.

loupe status checks the setup. Run it in the repository. It calls project_current through the MCP server and prints the name of the project. When a rule file exists, it also checks each account of the file, as Account checks says.

Connecting by URL

A client that speaks OAuth can also connect with the endpoint URL alone, with no CLI. Prefer this where the client is not on your own machine, such as Claude reaching your instance from Anthropic’s servers. The connection then binds to one project, so a second project needs a second connection.

An MCP client that supports OAuth connects with the endpoint URL alone. You do not copy a token. Claude Code and Claude connect this way.

In Claude Code, add the server, then sign in:

claude mcp add --transport http loupe https://loupe.example.com/mcp
claude mcp login loupe

You can also run /mcp inside Claude Code and select the server. Claude Code opens the Loupe consent page in your browser. Sign in, choose the project, and select Allow.

In Claude, add a custom connector with the same URL, then connect it. Claude reaches your instance from Anthropic’s servers, so the instance must be reachable from the internet over https. An instance on a private network or behind a VPN works with Claude Code only.

The connection is bound to one project. The Connected apps section of your account settings lists it and revokes it. See Connected apps.

A client finds the sign-in in three steps:

1. POST /mcp with no token answers 401. Its WWW-Authenticate header points at /.well-known/oauth-protected-resource/mcp.
2. That document names the endpoint as the resource and Loupe as its authorization server.
3. The client identifies itself with a Client ID Metadata Document. Its client id is an https URL, and Loupe fetches that document to learn the app’s name and redirect addresses.

Loupe has no Dynamic Client Registration. A client that supports only that cannot connect by URL. Connect it through the Loupe CLI instead, above.

For a self-hosted instance:

• DEFAULT_URI must be the https URL that clients use. The resource https://<host>/mcp and the issuer are built from it.
• MCP_ALLOWED_HOSTS must contain that host.
• The web container fetches a client’s metadata document when a user connects that client. The fetch goes to public addresses only. An instance with no internet access cannot connect a new client, and every other feature works.

There is no static token

Loupe issues no static API token. No page mints one, and the server accepts none. Every connection is an OAuth sign-in, and the client refreshes it by itself.

Each sign-in needs a person at a browser once. An MCP client opens the consent page. The Loupe CLI prints a device code for a page you open. A machine where nobody can open a browser cannot get a credential, so CI and scripts cannot reach /mcp or /api.

A connection carries one scope. The mcp scope binds to the one project you pick on the consent page, so every tool call knows which project it acts on. The agent scope reaches the CLI endpoints and binds to no project. The site-review scope reaches the comments of one project, which is what the site-review widget uses. See Connected apps for the whole table and for how to revoke a connection.

403 insufficient_scope means the sign-in is valid and carries the wrong scope for that endpoint. Connect the client again with the scope the endpoint needs.

A project’s Connect page shows the command for each way on this page. The first-run wizard shows the same commands at /welcome/connect.

The Claude Code plugin

The plugin ships skills, and no MCP server. loupe login and loupe init set the server up, so nothing here holds a credential and nothing asks you for one.

claude plugin marketplace add ubermuda/loupe
claude plugin install loupe@loupe

It installs one skill for each part of working a Loupe project:

Skill	Covers
loupe:loupe-documents	Writing a document so the review UI reads well
loupe:loupe-site-review	Acting on widget comments and marking them addressed
loupe:loupe-board	Reading a board, writing a card, linking a pull request
loupe:loupe-inbox	Asking the project owner, and ending a turn on a blocking ask
loupe:loupe-workers	Reading worker runs and bridges, and stopping, resuming or cancelling a run
loupe:loupe-analysis	Running an analysis: a cost report, or a comparison of the variants of an experiment, with proposals
loupe:loupe-discovery	A read-only discovery run that writes the readiness report of a project
loupe:product-design	An interactive product design session with the owner, from a card or a one-line idea
loupe:loupe-stage-product-design	One review round on a product document
loupe:loupe-stage-tech-design	A card entering the tech design column
loupe:loupe-stage-implementation	Building an approved design into a pull request
loupe:loupe-stage-fix-round	One round of review feedback, from a fix request or run by hand
loupe:loupe-stage-merge	Merging a ready pull request, or updating one that is behind its base
loupe:loupe-stage-repair	Fixing the cause of failed work, after its retries run out

The plugin carried an MCP server until version 0.2.0, as an HTTP endpoint plus a project API token you typed at install. Two things were wrong with it. A plugin holds one set of config values per user, so that was one token across every project you work in, and an MCP credential binds to one project. And the token sat in your configuration for as long as the plugin was installed.

loupe mcp has neither problem. The project comes from .loupe.yaml in the repository, so one setup serves every project, and the credential is an OAuth login the CLI refreshes rather than a token you paste.

If you installed an older version, the plugin’s server is still declared. Remove it by reinstalling the plugin, and check with claude mcp list, which should show loupe and no plugin:loupe:loupe.

What the tools do

Roughly in the order an agent uses them:

Tool	Purpose
project_current	Report which project this connection acts on, with its id, slug and name
project_update	Change the project’s name, description, domain or search language. A new name also changes the slug
project_origins_set	Replace the list of site origins the sign-in widget may run on
readiness_guide_set	Show or hide the readiness checklist on the Workshop
readiness_get	Read the readiness checks of the project, each with its status, and the state and the runId of the latest discovery run. readiness_report_submit takes that runId. It works while the Workshop guide is hidden
discovery_start	Start a read-only discovery run on a new Backlog card. A running bridge must serve the project, the project needs a workflow with board automation on, and one run can be open at a time
readiness_report_submit	Submit the report of a discovery run: the findings, and the cards it proposes. Loupe writes the report as a document for review. When the owner approves it, each ticked proposal becomes a card in Next. A run takes one report
workflow_get	Read the workflow of the project: its template and version, the board columns with the slot of each, and each kind of work with the rules that ask for it and its checks
document_create	Submit Markdown as a new document, or as a draft with draft; returns a review URL, the language it was stored in and its status
document_revise	Submit a new version, described by what changed
document_publish	Send a draft to review, so it reaches the reviewer’s inbox
document_get / document_list	Read a document, or enumerate the project’s, with search and filters
document_get_review	Verdict, threaded comments, and answered decision blocks
document_reply_to_comment	Reply to a reviewer’s thread
document_mark_comment_addressed	Mark a thread acted on
document_highlight	Tint the passages to read first (off by default — see below)
document_rename	Change the title without minting a version
document_archive / document_unarchive	Take it out of the listing, or put it back
document_set_tags / document_set_references	Group it, or link it to sibling documents
document_set_series	Place it at a numbered position in an ordered set, or take it out of one
tag_list	The project’s existing tag vocabulary
series_list	The project’s series, each with its document count and highest position
series_rename	Rename a series; every document in it keeps its position
feedback_list	The project’s site-review feedback, each item with the card it belongs to (off with the board, see below)
feedback_mark_addressed	Mark feedback items acted on, so the next feedback_list skips them (off with the board, see below)
agent_review_submit	Submit the review of a pull request of a card, with findings on file lines. A finding has the category code (the default) or spec, a gap between the pull request and the approved design. Only a spec finding can leave out the file and the lines. A spec finding can set needsPerson when a worker cannot settle it from the design and the code alone. The fix worker then asks the owner. Only a running review worker of the card can call it. Loupe stores the review against the commit it names, and the agent-review-check forge write shows it as a check on the pull request. The result field current says whether that commit matches the last head commit that Loupe read from the forge
card_create	Put a card on the project board (off with the board, see below)
card_list	Read a page of the board, filtered by status, type, reporter or parent, with the board’s columns
board_columns	List the board’s columns, each with its slug, label, terminal flag, default flag and backlog flag, and the card types of the project
card_search	Search every card’s title and body by words, finished ones included
card_get	Read one card, with the pull requests and their stored state, the latest agent review of each pull request as agentReview, and the feedback linked to it. The carriedTo list of agentReview names each later head that Loupe made a carried check for. Its postedAt is null while that check is not posted yet
card_get_history	Read a page of one card’s history, newest first: its creation, its moves and the automation’s actions
card_update	Change a card, or move it to another column
card_run_open	Record an open interactive session on a card, and optionally move the card in the same step
card_run_close	Close the interactive run a session opened on a card, and ask the bridges for the usage of the run
artifact_list	List the stored design artifacts of the project, newest first (off with artifacts.enabled, see Artifact tools)
artifact_get	Describe one artifact: its versions, and the files of one version
artifact_read	Read one file of an artifact, as text or as an image
artifact_archive / artifact_unarchive	Take an artifact out of the list, or put it back
column_create	Add a column at the end of the board, from a label
column_update	Rename a column, or set whether it is terminal
column_reorder	Put the columns in a new order; Backlog stays first
column_delete	Delete a column, and move its cards to targetColumn
automation_settings_update	Change the board’s Automation settings
inbox_ask	Hand questions and to-dos to the project owner (off by default, see below)
inbox_search	Search every inbox item’s title and body by words, closed ones included
inbox_join	Add an open item that is already in the inbox to the session’s own ask
inbox_list	Read a page of inbox items, filtered by state, ask, session, card or document
inbox_get	Read one inbox item, with its answer and its links
inbox_withdraw	Withdraw an open item that is no longer needed, with a reason
inbox_settings_update	Turn the inbox wait switches on or off (off with the inbox)
worker_run_list	Read a page of the worker runs, newest first, filtered by state, card, work kind, bridge, harness, account, model, words or the time a run ended. Each row gives the reason the run ended, its harness and account, its usage per model, its model, its experiment and variant, and its metrics. The metrics hold the sums of the run and its timing: the tool time, the model time, the idle gaps, the subagent time, and the count, failures and longest duration of its tool calls. They also hold the host of the run: the mean CPU use, the peak memory and swap, the count of runs that overlapped it on its bridge, and whether its machine ran on battery
worker_run_get	Read one worker run in full, with every run of its series, its state changes, its output, its metrics and the commands sent to its bridge
worker_run_tool_calls	Read a page of the tool calls of one worker run, in the order the worker made them. Each call gives its tool, its start, its duration, its error flag, whether a subagent made it, and its signatures. perPage defaults to 20, with a maximum of 100
bridge_host_samples	Read a page of the host samples of the bridge that ran one worker run, oldest first, from the start of the run to its end, or to now while the run is open. Each sample gives its time, the use of each core, the memory and swap in use, the total memory, the battery charge and the power source. The samples cover the whole machine, so they cover every run on that bridge at that time. perPage defaults to 100, with a maximum of 500
metric_list	List the metrics of the worker runs and the finished cards, with the units, statistics and groups each one takes. It adds one bucket-time:<name> entry for each bucket that has time on a run of the project
metric_query	Read one metric over time, by run or by card. Each group gives a series with a total, a point per period and the rows behind it. The metric bucket-time:<name> reads the time of the main-session tool calls of a run in one bucket, in milliseconds. A name is 1 to 64 characters of a-z, 0-9, _ and -. A run with no data for any bucket has an unknown value
experiment_get	Read the comparison of one experiment: the variants, each metric with its likely range per variant and whether it gives a clear answer, and one page of the cards, with the reasons a card is left out
analysis_get	Read one analysis, with its topic, its range, the experiment that an experiment analysis compares, its model and effort, its state and reason, its cost so far and its proposals
analysis_report	Finish an analysis with its report document and at most 20 proposals, each a card or a bucket-rule
analytics_settings_get	Read the analysis settings of the project: the default model and effort, the programs with subcommands, and whether the bridge sends the full text of each tool call
analytics_settings_update	Change the analysis settings of the project. clearDefaultModel or clearDefaultEffort set to true clears the project value, so the instance default applies. An empty model or effort also clears it, and an empty list of programs clears the project list
bridge_list	List the bridges that follow the project, with their name, their push login, their heartbeat, their pause, their worker pools, their account checks and their open runs
worker_run_resume	Ask the bridges to resume up to 50 ended worker runs, each resumed or refused on its own
worker_run_stop	Ask the bridge to stop a queued or running worker run. The stop does not make the card unmanaged, so call card_hold for that
card_hold	Make a card unmanaged, by cardId or number. The workflow makes no move and starts no work on the card, and no bridge starts a worker on it, until card_release. Loupe cancels the work requests of the card that no bridge took yet. A live run goes on
card_release	Make an unmanaged card managed again. The queued runs on the card then start, and the workflow asks again for the work that the card still needs
card_pause_release	End the workflow pause of a card, by cardId or number, so the paused rule runs again with a fresh budget. It ends a pause of kind retries, work-limit, work-timeout or work-stopped. It does not end a hold, which card_release ends
bridge_command_cancel	Withdraw the resume or stop command that waits on a worker run, before its bridge reads it

Changing the project settings

project_update, project_origins_set and readiness_guide_set change the settings of the bound project, as Project settings does. inbox_settings_update changes the switches of the inbox settings page. An argument that a call omits keeps its value. On project_update, an empty description or domain clears it. A new name also changes the project slug, so a bridge rule file that names the old slug stops matching. project_origins_set replaces the whole list of allowed origins, and an empty list clears it. The tools refuse what the settings pages refuse, and the error names the argument to fix.

Staging a draft

Pass draft: true to document_create to keep a document out of review. A draft does not reach the reviewer’s inbox, and document_revise keeps it a draft. Call document_publish to send it to review. For a document that is not a draft, document_publish changes nothing and returns published: false. It refuses an archived document.

Finding a document without reading every one

document_list returns one row per document. Each row carries the description of the document’s current version, which says what the document is about. Read that instead of calling document_get on every row.

Four arguments narrow the list:

• search matches full-text terms against every document’s title and current content. Quotes and OR work as they do in a web search box. The rows come back by relevance instead of by recency.
• status keeps one state: draft, in-review, approved or changes-requested. An unknown value is refused, and the error names the accepted values.
• tag keeps the documents that carry one tag. The match ignores case and surrounding spaces. Read tag_list for the project’s vocabulary.
• series keeps the documents in one series and orders them by their position in it. The match ignores case. Read series_list for the project’s names.

The arguments combine. Archived documents stay out of every result until you pass includeArchived. Paging works the same way under a search: pass page while hasMore is true.

The language a document is searched in

Search stems words, so it must know the language a document is written in. Every document carries its own. document_create takes an optional language, and document_get reports the value back.

The value is a PostgreSQL text-search configuration name, such as english, french, german, spanish, portuguese or russian. Use simple for text of mixed or unknown language, which then matches on whole words only. An unknown name is refused, and the error lists the accepted ones.

A document that names no language takes the project’s default. You choose that default when you create the project, on the new-project form or on the first step of the first-run wizard, and it is english for every project that came before the field. The project settings screen changes it afterwards, and the change applies only to documents written after it. Every document written before this feature stays English, because that is how it was already indexed. Changing a document’s language after it exists needs a reindex, which no tool does yet.

A feedback item carries a list of anchors

feedback_list and card_get report each feedback item’s elements in an anchors list.

{
  "id": "...",
  "url": "https://staging.example.com/pricing",
  "body": "These two should sit side by side.",
  "anchors": [
    { "selector": ".plan-card", "text": "Starter", "quote": null, "quotePrefix": null, "quoteSuffix": null },
    { "selector": ".plan-note", "text": "Billed yearly per seat", "quote": "per seat", "quotePrefix": "Billed yearly ", "quoteSuffix": "" }
  ],
  "hasDrawing": false
}

An item with several anchors says something about how those elements relate, so read them together. An empty anchors list is a note about the page as a whole.

An anchor whose quote is a string points at that run of text inside its element, and quote is then the subject of the item. One whose quote is null points at the whole element. quotePrefix and quoteSuffix hold up to 32 characters of the surrounding page text; they exist so the widget can find the passage again when the same words appear twice in one element, and they are not part of what the reviewer said.

A live page has no version boundary, so a quote can stop matching. The widget then falls back to drawing the element, and the payload keeps the quote. An agent that cannot find a quote on the page should report that rather than guess which text replaced it.

A drawing is reported as a flag, not as points

A reviewer can draw freehand over the page as part of a note. feedback_list and card_get report hasDrawing and nothing more. The strokes are vector points measured against a live page, which no agent can render, so the points would cost a large payload and buy nothing.

Read hasDrawing: true as “the reviewer pointed at something the words may not name”. Act on the words. Ask the reviewer when they do not say enough, rather than guessing what the drawing meant. The reviewer’s own data export carries the points in full, under strokes in each card’s feedback in cards.json.

Two things agents get wrong

Comment ids do not survive document_revise. Re-anchoring copies a comment onto the new version and leaves the original behind, so replying after revising writes into rows nobody reads. Reply first, then revise — or revise, then re-read the review for fresh ids. See Documents and review.

A decision block’s id is permanent. Rewording its options is safe; changing its id silently discards the reviewer’s answer.

A decision reports its type. A single-choice block answers in selected and selected_index. A multi-choice block answers in selections, and reports null in selected. Each decision also reports the reviewer’s note, and updated_at for the time of the last save. Both are null while the decision has no answer, and note is also null when the reviewer picked an option and wrote no note. See Documents and review for the syntax.

What feedback_mark_addressed skips

The call never fails on an item it cannot mark. It marks the rest and returns the others under skipped, each with a reason.

Reason	Meaning
unknown	No such item on this project, or the reviewer deleted it
invalid_id	The id is not a UUID
already_addressed	An earlier pass marked it
resolved	A human signed it off, or its card finished

The reason is best-effort. The tool writes the status first, then reads the item again to learn why it skipped. Another writer can change the item between those two steps, so a reason can name the wrong status. The skip itself is always correct, because the write only touches an item that is still pending.

A card that moves into a terminal column resolves its pending and addressed feedback. So an agent that finishes a card with card_update also resolves the feedback on it. See Review feedback on a card.

Configuration

document_highlight is behind the review.highlights.enabled feature flag, seeded off. An agent tinting the passages a human should read first steers the review, which is a nudge an operator opts into rather than inherits. While it is off the tool is absent from tools/list and from the Connect page, so an agent never learns of a tool this instance would refuse — switch it on in Admin → Feature flags. A client holding a tool list from before the flag changed and calling it anyway gets a plain refusal, not a broken call.

Each board has its own columns. board_columns lists them in board order, and card_list returns the same list in columns beside its cards. The status argument of card_create, card_update and card_list takes a column slug. An unknown slug is refused, and the error lists the slugs the board has. A terminal column is where finished work goes, and a card that enters one gets a completedAt.

A card created with no status lands in Backlog, whose slug is backlog. Backlog is not drawn as a board column, and it has its own page. board_columns lists it with default and backlog both true. Renaming a column changes its slug.

column_create, column_update, column_reorder and column_delete change the columns, as Board settings does. They refuse the changes that Board settings refuses, and the error says what the agent can fix. For example, a delete of a column that holds cards needs targetColumn. automation_settings_update turns the workflow of the board on or off with enabled, as the Automation tab does. A call that omits it keeps the value.

The board has no delete tool. An agent moves a card to a terminal column; only a person removes one. card_update also refuses to change reporter, because that field records who first raised the card.

card_update reads an omitted field as “leave it alone”. pullRequestUrls is the one field where an omitted list and an empty list differ: omit it and the links stay, send [] and every link is removed.

Every card carries a number beside its cardId. The number counts from 1 inside one project, so a person can say “card 42” and an agent can name a branch after it. Two projects each have a card 1. card_get and card_update take either cardId or number, never both. A number resolves only inside the project that the connection is bound to. The other tools take no number.

A card_list or card_search row is a summary with nine fields: cardId, number, title, type, status, reporter, parentCardId, updatedAt and state. parentCardId is null for a card with no parent. state is null, or holds kind, code and since: what the card needs now on the board, which is stuck, needs-you, working or waiting. code is the key of a workflow marker. The codes session-open, waiting-on-checks and nothing-happened are new. A chip such as Unmanaged is not in state, so a card with only a chip has a null state. The full card adds reason and others to state. The board lists the codes.

A card has a type. The workflow template of the project declares the types, so each project can have its own. board_columns returns them in types, and defaultType names the type of a card that is created with no type chosen. Each entry has a key, a label, and two capabilities: children and lane. The type argument of card_create, card_update and card_list takes a key. A key that the template does not declare is refused, and the error lists the declared keys.

A type with the children capability groups other cards. Its cards are one feature that is too large for one pull request, and their child cards hold the parts. card_create and card_update take parentCardId, the id of a card of the same project. On card_update, omit it to keep the parent, pass clearParent set to true to clear it, and send an id to set it. An empty string also clears it. card_update refuses clearParent together with a parentCardId. Only a card of a type with the children capability can be a parent, and such a card cannot have a parent. A card with a parent cannot change to such a type, and a card with children keeps its type. Both tools also take laneEnabled, which says whether the board draws a lane for a card of a type with the lane capability. It defaults to true.

Both tools also take childDesign, for a child of a parent whose tech design is approved. The value inherit links the tech design of the parent. The value own moves the card to Tech design, so a call that passes own passes no status. When the owner would otherwise get the unplanned child question, card_create is refused without the choice, and so is a card_update that sets parentCardId. The call is also refused when the card has no parent, when the parent has no tech design to inherit, or when the workflow does not allow the move. A refused call changes nothing.

card_list takes parentCardId as a filter, which reads the children of one card. The full card, from card_get or from card_list with full, carries state on each entry of pullRequests, the last state Loupe read. The board lists its keys. It also carries four more keys. parent holds cardId, number, title and status, or null. laneEnabled is a boolean. children lists the children of a card with the same four keys. progress holds done and total for a card of a type with the children capability, and null for any other card. A child counts as done when it sits in a terminal column.

The full card also carries pause, the active workflow pause of the card, or null. A pause holds pauseId, kind, reason, ruleId and since. The kind is rule, retries, work-limit, work-timeout or work-stopped. card_list takes paused as a filter: true keeps the paused cards, and false keeps the cards with no pause. card_pause_release ends a pause of any kind except rule. Pass the pauseId you read, and the tool refuses with pause-changed when the active pause is a different one.

The inbox_* tools are behind the inbox.enabled feature flag, seeded off. The gate behaves the same way as the board gate: while the flag is off the tools are absent from tools/list and from the Connect page, and a client that calls one anyway gets a plain refusal.

An item is one question, review request, or to-do for the project owner. An ask is the set of items that one agent session hands over at once. inbox_ask and inbox_join take a required sessionId. A session reads it from the first set variable of $LOUPE_SESSION_ID, $CLAUDE_CODE_SESSION_ID and $CODEX_THREAD_ID. The bridge sets $LOUPE_SESSION_ID for each session it starts. One session holds at most one open ask, so a second inbox_ask from the same session adds its items to that ask. A question blocks by default; a to-do or review requires blocking: true to block. An ask with no blocking item closes at once, and its items stay open in the inbox.

inbox_list and inbox_get take an optional readerSessionId. Pass your own session id there to record that you read the answers of your closed asks. A read counts only for an item that the call returns and that a closed ask of that session holds. The first read is kept.

Loupe trusts the readerSessionId it receives, so pass only your own session id there. The sessionId argument of inbox_list is a filter and never records a read, so filtering by another session’s id leaves its answers unread.

Every item row carries origin. The value is agent for an item that an agent asked, or loupe for an automatic item. Loupe opens an automatic item with the kind wait while a card waits for a person, and closes it when the card stops waiting. An item with the kind notice states a fact of the project. A notice holds no card and takes no answer.

inbox_get also returns cardId and waits. For a wait item, cardId names the card, and waits lists each reason the card waited, current and ended, in start order. Each entry holds trigger, type, reason, documentId, versionNumber, runId, pullRequestId, headSha, pauseId, startedAt, endedAt and endReason. type is document, pull-request, worker-run or card-pause. reason is a code, such as waiting-for-review, new-commits-after-approval, blocked, gave-up, waits-for-person or the kind of a pause. It is no sentence. An id, a commit or a date that does not apply is null. endedAt and endReason are null for a current wait. endReason is resolved, card-finished, card-deleted, switched-off or dismissed. For any other kind, cardId is null and waits is empty.

Each entry of asks in inbox_get carries origin too. The sessionId of a Loupe ask is null.

inbox_join accepts an open wait item. Your ask then closes when Loupe closes the item. A bridge that started you then resumes you. inbox_withdraw refuses a wait item or a notice, because only Loupe closes it.

With readerSessionId, each inbox_list row also carries the response: options, selectedOptions, answerText, closeNote, and review. Without it, a row is the short summary, and inbox_get reads the answer.

Create a Review item with kind: "review" and exactly one reviewDocumentId or reviewPullRequestId. Read pullRequestId from card_get; it identifies a stored card link, not a code-host number. Review items take no question options, multiple, or freeText. The target document or PR card is linked automatically, alongside any context links you supply.

review carries the target, verdict, note, reviewer, submission time, and reviewed document version. It is null for other item kinds. An unanswered review has a null verdict. review.withdrawal separately records a document verdict withdrawal without changing the completed answer. PR results stay in Loupe and do not submit a code-host review.

Every card id and document id an item links to must belong to the token’s project, or the call is refused. An item closes as obsolete when every card it links to is moved into a terminal column, by a move or by a column delete. A move or a delete while the inbox is off closes no item. Only an open item can be withdrawn.

inbox_ask takes at most 20 items in one call. An item takes at most 20 options, 20 card ids, 20 document ids and a body of 20,000 characters. Each option is at most 500 characters. Its title is one line, and its options must differ from each other. The context of an ask is at most 10,000 characters, counting what earlier calls appended. A withdraw reason is at most 2,000 characters. A second call that names a different bridgeId from the one the open ask holds is refused.

MCP_ALLOWED_HOSTS is a DNS-rebinding allowlist — hostnames only, no port. It must contain the hostname agents actually use, or every call is rejected with a 403 that names the variable and echoes the host it rejected. See Environment variables.

An unauthenticated POST /mcp answers 401, not 404, with a WWW-Authenticate header that points at the protected resource metadata. A 404 means the route did not register. A 403 with a plain-text body is the rebinding guard. A 403 with insufficient_scope means the sign-in is valid and does not carry the mcp scope.