pg.ddx.io: the PostgreSQL community's memory MCP

START HERE for a question about PostgreSQL. Searches every mailing list (inbox narrows it) with hybrid keyword + semantic ranking and returns cited passages that fit token_budget (default 4000, max 32000): one passage per thread, each the author's own words (quotes, signature and patch removed, cut at ~1200 chars) with url, inbox, message_id, from and date. found=false with a reason when the archi

Run timeline for one animal. Filterable by branch and start cutoff; ordered newest first.

Animals run by one owner: list, branches each tracks, last status, first_seen_at and elapsed days since first observation.

Show the commit history that modified a symbol's file, filtered to the symbol's line range.

Browse threads within a specific date range. Useful for exploring what was discussed during a particular time period.

Most recent :entry/last-build-at observation across all entries. Use to detect a stalled cfbot scraper.

No parameter schema on file.

High-level buildfarm health: animal count, recent run counts, currently-failing animals, top owners, OS / branch breakdown, and freshness.

No parameter schema on file.

Check whether a pull request has been merged upstream. Returns the latest patch series head commit and any merge information.

Get code indexing statistics: files indexed, symbol counts by kind and language, edge count, community count.

Get a directory-level overview of the codebase showing file counts and symbol counts per directory.

Buildfarm results for one PostgreSQL commit: every animal that built it, with branch, status (passed/failed/flapping), the failing stage and the log url, plus a {passed, failed, flapping, unknown} rollup. commit_sha is a SHA (>= 7 hex) or a branch, tag or major version (17, 9.6) for the commit it points at. Cite the commit SHA and the log urls.

Everything linked to one commit: subject, author and date with its sha, the mail thread its Discussion: link names (participants resolved to people and organizations), the commitfest entry if tracked, and Discord mentions. For postgres also first_releases (per branch the change landed on: branch, sha, release e.g. 14.23 or null when unreleased, first_version incl. betas, shipped=false when it was

Overview of all indexed commitfests: count by status, top contributors (entries authored), distinct people / commitfests / entries totals.

No parameter schema on file.

Summary of contribution counts per release: unique people, distinct commits, role breakdown (count(DISTINCT commit_sha) per role, canonical authoritative repos only), and revert-commit count. Powers the /community hero strip.

Detect which symbols changed between two commits by comparing file content hashes.

Discussion / Closes / Fixes / Backpatch-through trailers attached to one commit. Returns the raw trailer text and any URL extracted. For the messages those links resolve to, plus the committers announcement and messages citing the SHA, use git_search (mail_refs on each result).

Get embedding coverage statistics: how many messages have embeddings, which model was used, and when embeddings were last generated.

Repository branches tracked for a commitfest entry. Joins commitfest.entry_repos with ag_repositories so callers see repo name + branch_name + is_authoritative.

Status changes for a commitfest entry across commitfests. The relational table doesn't carry an audit log, so we approximate the patch's lifeline by joining on shared :entry/thread-message-id (precise) and falling back to title-prefix substring (weak).

Animals that failed on a branch within the time window bounded by two commit SHAs. The window is defined by the earliest started_at observed for either SHA on that branch — not by git topological order, since the buildfarm tables don't carry commit ordering.

Find raw contribution rows for one person: git commit SHAs / buildfarm animals tagged with a role + release. Useful for drill-down on a contributor's recent work.

Find functions/methods with zero incoming call graph edges (potentially unused code).

Find commitfest entries where the given person is an author. Looks up by email (exact) or by name (substring, case-sensitive).

Find commitfest entries linked to a pgsql-hackers thread by Message-ID. (Returns empty until the mailing-list cross-reference scrape lands; the index attribute :entry/thread-message-id is in the schema.)

Cross-domain feed: recent failed buildfarm runs for a named animal, plus commitfest entries with cfbot :failing rollups whose tracked branches overlap the animal's. Note: buildfarm runs commit SHAs and cfbot runs cf/<id> branches, so this verb correlates by branch overlap and time window — not by direct schema join.

Commitfest entries whose latest cfbot build fails on at least one platform: cf_id, title, entry_status and commitfest_number. entry_status filters (default the active reviewable statuses, e.g. needs-review, ready-for-committer); platform narrows to one CI platform; limit caps the list. Cite https://commitfest.postgresql.org/patch/<cf_id>/.

Most recent failing buildfarm runs across the entire fleet. Filterable by branch and start cutoff. Use to answer 'what is broken right now?'

Green patches stuck in review: entries whose builds pass on every platform yet whose :entry/last-updated is older than N days. Useful for the 'why isn't this committed yet?' question.

Patches that pass on some platforms but not others. Example: passing on linux but failing on macos -> portability bug.

Search for a regex pattern in code symbol bodies. Uses trigram indexes for acceleration.

Entries cfbot reports as no longer applying to master tip (:entry/applies-cleanly is false). These need an author rebase.

Find mailing list messages related to a commit, topic, or PR. A postgres commit SHA (7-40 hex) returns the mail that refers to that commit (match_mode commit): its Discussion: threads first, then the committers announcement, then messages citing the hash, each with how_it_refers. Anything else searches subject and Message-ID fields via case-insensitive substring; if that returns no hits and an emb

Find messages similar to a given message using its embedding vector. Useful for finding related discussions or duplicate threads.

Profile of one buildfarm animal: hardware/OS/compiler/owner, branches tracked, last build status, plus the last 20 runs (any branch).

The content of one attachment of a mail message (a patch, a log, a test case), chosen by 1-based index or a filename substring, as listed in get_message/get_thread attachments. Text attachments come back as decoded text (a .patch is ready to read or git apply), binary ones as base64 with encoding=base64; size is the decoded byte count. Cite the message as https://postgr.es/m/<message_id>.

Find messages by a specific author, optionally filtered by date range. Uses the f: (from) search prefix.

Find all symbols that the given symbol calls/references (forward call graph).

Reverse call graph: the symbols that call or reference qualified_name (from search_symbols), each with its file and lines, like git grep -w <name> restricted to call sites. HEAD only; macro expansion and function pointers are not followed. limit caps the list. Read a caller with git_show_file at its line.

Get a single commitfest with entries grouped by status and the top contributors (authors with the most entries).

List Louvain community clusters detected in the call graph. Communities group related symbols by functional area.

Get details and member symbols for a specific community.

A contributor's profile by email (exact) or name (substring): canonical name, page hash, totals and per-release counts by role (authored, reviewed, committed, reported, ...), the 5 latest credited commits (commit_sha = the git SHA, roles = every role they had in it), and buildfarm animals they own. People who hid their page are excluded from name lookups. For what they did recently use whats_new.

Show all past mailing list submissions by a contributor (matched by email address or name).

Get transitive dependents: all symbols in the blast radius if this symbol changes.

One PostgreSQL documentation page as text: path (e.g. "brin.html" or "sql-createtable.html") and optional version ("17", "current"; default the latest). Returns its url, path and stored text (body) with fetched_at. Use search_docs to find the path. Cite the returned url.

One commitfest entry by cf_id (the number in commitfest.postgresql.org/patch/<cf_id>/): title, status, commitfest, authors, reviewers, committer, its mail threads and branches. Read the thread with get_thread; cfbot state with find_failing_patches. Cite https://commitfest.postgresql.org/patch/<cf_id>/.

Trace execution flow paths through the call graph from entry points.

Analyze the impact of modifying a symbol: risk level, blast radius, affected communities and execution flows.

Get metadata for an inbox (name, addresses, message count, last activity)

Return aggregate statistics about an inbox: message counts by time period, top authors, and activity trends.

Per-inbox summary: total messages, top 10 posters, thread count, date range, and lifetime average messages/day (total messages divided by the days spanned by the archive).

One mail message by Message-ID: headers, in_reply_to/references, decoded body text (by default the author's own words: quotes, signature and inline patch removed; full_text=true for everything, quotes included), attachments [{index, filename, content_type, size}] and has_patch. Never raw MIME: get_attachment returns an attachment's content, get_raw_message the RFC 822 source. Finds the list itself

Get email headers as structured key/value pairs. Returns all headers or a specific header by name.

Discover cross-references in a message. Returns explicit References/In-Reply-To headers plus any Message-IDs found in the body text, with archive lookup for each.

Return messages newer than a given article number cursor, enabling agents to poll for new messages without re-scanning. Use after=0 for the first call, then use the returned last_article_num as the cursor for subsequent calls.

Get the git branches created from a patch series. Shows what branches were applied from email patches for code intelligence analysis.

Build matrix for one entry: per-platform/config status, log URL, observation time, applies-cleanly flag, rollup.

Get patch submission history for a forge pull request URL. Returns all iterations submitted to the mailing list.

Get the complete raw RFC 822 email bytes for a message. Useful for agents that need to parse headers/structure themselves or forward messages.

Get commit frequency analysis and sync statistics for a repository. Returns median commit interval, recommended poll frequency, and recent fetch log.

Per-repository summary: total commits, top 10 contributors, branches, language breakdown (from indexed symbols), and a sampled most-touched-paths list.

Get the function/method signature and doc comment for a symbol.

Detail for a single source by name, the same row list_sources returns. Returns kind, item_count, last_update, next_sync, freshness_status, and description.

Get full details for a code symbol by its qualified name, including source code, signature, documentation, and file location.

Find test symbols that reference the given symbol.

A mail thread, found by any Message-ID in it, oldest first. Each message: from, to, cc, date, message_id, decoded body text (by default the author's own words: quoted replies, signature and inline patch removed; full_text=true for the whole decoded text; never raw MIME), attachments [{index, filename, content_type, size}] and has_patch. Paged: 20 messages per call (limit max 500; offset/next_offse

Cross-reference graph for an entire thread. Collects all Message-IDs referenced in body text across all messages in the thread and resolves which other threads they point to.

Get revision history for a wiki page.

One wiki.postgresql.org page by title: its latest revision content with author and date. Titles are as on the wiki ("Don't Do This", "Todo"). Use search_wiki to find a title, get_wiki_history for older revisions. Cite https://wiki.postgresql.org/wiki/<title>.

Show commit activity over time, bucketed by period. Useful for understanding development pace and trends.

Get commit statistics per author: total commits, first and last commit dates. Ranked by commit count.

Identify files with the fewest distinct authors (bus factor risk). Files modified by only one person are knowledge silos.

Identify the most frequently modified files in the repository. High-churn files may indicate hotspots or unstable code.

Find files that are frequently changed together. Logical coupling can reveal hidden dependencies between components.

Aggregate file churn by directory to find the most actively changed areas of the codebase.

File version history, not a per-line blame: the commits that changed a file on the history of a commit (like git log <rev> -- <path>), newest first, each with sha, commit_id, author, date, summary and status (added/modified/deleted). Renames are not followed. Up to limit commits (default 100, max 1000); has_more says there are older ones.

Two modes: (1) commit-range mode — pass base_branch and head_branch to get the list of commits unique to head_branch (set difference base..head), optionally filtered by author/message/path; (2) content-diff mode — pass from_commit and to_commit to compute file-level unified diffs between two specific commits.

Commit history like git log, newest first, filtered by path (commits touching a file), author (substring), since/until (YYYY-MM-DD or RFC 3339) and branch (any branch, tag or major version such as 17 or 9.6; default the indexed default branch). Each commit: sha (40-hex, cite it), commit_id, message (subject for a branch log), author and dates. limit default 50, max 200; offset pages; has_more. r

Search postgres commit messages (or file paths with search_in=paths) by keywords, newest first (all words must appear, case-insensitive; like git log -i --grep with every word). Each commit: sha (40-hex, cite it), commit_id, message, author, date, people credited, and mail_refs: up to 5 messages that refer to it {inbox, message_id, subject, url, how_it_refers: discussion-trailer, committers-anno

Read a file at any commit, branch, tag or major version (like git show <rev>:<path>), from the git clone. commit takes a SHA (>= 7 hex), branch, tag, 17 or 9.6, <ref>~N or a commit_id; default HEAD; an unknown name or path is an error, never a silent HEAD. Returns at most 2000 lines per call: start_line/end_line pick the range, total_lines gives the length and cut=true says more follow. Lines ar

One-shot historical context for CI: given content (a diff, file path, symbol, commit subject, or feature name), return the most relevant default-branch commits, the associated mailing-list discussion (message links), and the tracked people involved (community page links). Read-only; composes git history + list search.

Mailing-list search, keyword (BM25 over the authors' own words) and semantic (embeddings) blended per thread, over every list unless inbox names one or more. Returns up to limit threads (default 20, max 50), best first, each its best message: inbox, message_id, subject, from, date, thread_id, fused_score (0-1), similarity and a short excerpt of the author's own words. Like a ranked `git log --grep

Combined keyword + semantic code search using Reciprocal Rank Fusion. Requires embeddings to be generated.

List PostgreSQL buildfarm animals. Filterable by OS, branch tracked, last build status, or owner. Failing animals are returned first (sort key: last_status='failed' DESC, name ASC).

List tracked branches for a repository, including head commit and default branch status.

List PostgreSQL commitfests indexed in the mentat triple store. Each commitfest carries a status (:open / :in-progress / :closed) and an entry count grouped by status.

List PostgreSQL community contributors aggregated across git trailers (Reviewed-by, Tested-by, etc.), commit author/committer headers, and buildfarm animal owners. Sorted by total contributions descending. Filterable by release / role / source.

List monitored Discord channels with message counts.

No parameter schema on file.

List available documentation versions with page counts.

No parameter schema on file.

List commitfest entries (proposed patch series). Filterable by status, commitfest number, or topic; paginated.

List all configured agora mailboxes with name, message_count, latest_message_date, latest_import_date, listid (when known) and description. Optional min_messages filter; limit/offset are accepted for forward compatibility.

List bridge-configured projects linking a forge repository to a mailing list inbox.

No parameter schema on file.

List recent messages from an inbox

List all registered git repositories with name, branch, commit_count, file_count, indexed-symbol_count, latest_commit, last_fetched_at, and import_state. Optional min_commits and branch filters; limit/offset accepted for forward compatibility.

Every source behind this server with its kind (inbox, repository, docs, wiki, discord), item count, last update and freshness (fresh/stale): the 56 mailing lists, the git repositories, the documentation releases, the wiki and Discord. Use it to learn the inbox and repository names other tools accept and how current each is. kind filters; min_items drops small sources.

Browse recent threads (topic-level view). Returns thread summaries with message counts, date ranges, and latest message metadata.

Rolling window of commitfest entries updated in the last N days. Returns the entries plus a status histogram. Uses the relational commitfest.entries table for predictable latency.

Full-text search of commitfest entries (title first, then author/reviewer/committer names), in the current commitfest by default, or commitfests="all" (back to 2014) or a comma list of numbers. Websearch syntax: "phrase", -term, or. Each result: cf_id, title, status, commitfest(s), people, last update, the commitfest.postgresql.org patch url and the pg.ddx.io thread link. limit default 20, max 50.

Top contributors per role for one release. Scope: canonical authoritative repos only (ag_repositories.is_authoritative = TRUE). Returns top 20 per role across authored / reviewed / tested / reported / committed (per-role distinct-commit counts).

Get detailed statistics for a git repository including commit count, file count, branch, and import state.

Keyword search of mailing-list messages (BM25 over subject, sender and the authors' own words), every list unless inbox narrows it. Operators in query: s:/intitle: subject, f:/from: sender, b:/intext: body, after:/before:/d:2024-01..2025-01 dates, site:<list>, filetype:patch, link:<url glob>, /regex/. Returns messages best first (limit default 50, max 200; offset pages; collapse_threads=true keeps

Full-text search across mailing list messages using POSIX regex patterns. Supports edit-distance fuzzy matching via the k parameter (0 = exact regex, >=1 = up to k insertions/deletions/substitutions per match). Same prefix syntax as search: s:subject f:from t:to d:2024-01..2025-01 b:body_text

Unified search across all document sources (docs, wiki, and email). Returns results ranked by relevance. Search operators (site:, after:, before:, from:, link:, /regex/ ...) are applied per source; operators and warnings say what the query used, and skipped names each source the query left out and why. With define:<term> it also returns definition, the same card search_docs returns.

Find PostgreSQL Discord discussions semantically related to a query. Returns only the channel, approximate date range, and participants of relevant conversations — never message content or links (per the Discord community agreement).

Full-text search of the PostgreSQL documentation (websearch syntax: "phrase", -term, or), title matches first. Searches the current release unless version (one, e.g. "17") or versions (several) is given; a page matching in several selected versions is one result listing each version and its URL. Returns title, path, url, the versions it matched and a snippet. With define:<term> in query (define:MV

Find patch series by parsing [PATCH v2 3/7]-style subject prefixes. Returns structured patch metadata including version, sequence, total, and series grouping.

Find C functions, macros, types and variables by name in the indexed source (HEAD): BM25 on names, then fuzzy and body matches. Filter by kind (function, struct, macro, ...), language, repository. Each result: qualified_name, name, kind, language, file, start_line and end_line. Like ctags/git grep -w for definitions. Follow with get_callers, or git_show_file with start_line/end_line to read th

Full-text search (websearch syntax) of wiki.postgresql.org. By default searches each page's current text; history=true searches every revision and returns, per page, the latest matching revision (rev_id, revision_url, author, comment, timestamp, is_current) and how many matched; since/until bound the revision dates. Read a page with get_wiki_page; cite its wiki url. Search operators apply (intitle

Search messages on every list (or the lists in inbox) by semantic similarity using vector embeddings; each result names its inbox. Returns messages most similar in meaning to the query text. Requires embeddings to be generated first (see embedding_status). Each result carries an 'excerpt': the author's own words, quoted text and signatures removed.

Search code symbols by semantic similarity using vector embeddings. Requires embeddings.

List all code symbols defined in a file, ordered by line number.

Regular-expression search of the CURRENT source only (HEAD of master for postgres, the default branch elsewhere), like git grep -E with grep's line semantics: ^ and $ anchor at line starts and ends, . does not cross lines. PostgreSQL regex syntax (\s, \w, (?i) work). path_glob narrows by SQL LIKE pattern ("src/backend/%.c"), repository by name. Returns up to max_results files (default 50, max 50

Literal-text search of the CURRENT source only (HEAD of master for postgres, the default branch elsewhere), like git grep -F (regex characters are escaped; case_insensitive=true for -i). Returns up to max_results files (default 50, max 500), each with repo_name, file_path, line_no and snippet (its first matching line). For any other commit, branch, tag, major version or date, for every match wit

Find occurrences of a literal in current (HEAD) source, restricted to a syntactic kind: "strings" (inside double quotes), "comments" (after // or /*), or "all".

PostgreSQL community events in a date window: conferences, PGDays, meetups, online events, Call for Papers and registration deadlines, conference talks (with speakers and their pg.ddx.io person hash), Talking Postgres episodes, release dates and commitfests. Same data as the iCalendar feeds at https://pg.ddx.io/calendars (community event listings from the PostgreSQL Event Calendar, curated by Andr

List every pg.ddx.io calendar feed (iCalendar URLs) with event counts: all events, regions, countries, conference series, the PostgreSQL release cycle, teams and organisations.

No parameter schema on file.

Combine several pg.ddx.io calendar feeds into ONE subscription. Give feed paths or URLs as listed by calendar_feeds (e.g. events/region/europe, series/pgconf-eu, teams/committers, people/<8hex>, https://pg.ddx.io/cal/orgs/edb.ics; 1-200). Returns the combined feed's hash, canonical feed list, https url and webcal url. The same selection always yields the same URL.

What relates to one stored item, and what happened to it. ref: a Message-ID or message URL, a commit SHA or URL, a docs URL or page.html, a wiki URL or title, a commitfest URL, CVE-YYYY-NNNNN, or feature:<words> (matched to commitfest titles and to the subjects of the postgres commits that introduce it; ref.entries_used and ref.commits_used say which; a name nothing matches gives empty results, no

Catch up: everything a person or group did, and where they were named, in a window, newest first per kind (mail grouped by thread). who: a name (fuzzy; close matches return ambiguous [{name, hash}]), email, hash:<8 hex>, team:<slug>, org:<name>, new:<window>, a phrase ('the core team'), or a list. since/until: ISO date, today, 2w/14d/1m, pg19 (a release's development window), all; default 14 days.

Search the postgres source at any commit, branch, tag or date (or across history), from the code-history index: every line of every commit, byte-exact. A literal by default; match=regex for a PostgreSQL regex (^ and $ are per line; \b \< \> as in grep), match=identifier for any of snake_case/CamelCase/UPPER spellings. File sets agree with git grep -l at the same commit. Results name the resolved

Read a file of the postgres source at any commit, branch, tag or date from the code-history index: numbered lines, at most 2000 per call (page with start_line/end_line), byte-exact to git. Says total_lines and complete; binary files return their metadata only.

List the files of the postgres source under a directory at any commit, branch, tag or date (code-history index), with line counts; depth folds deeper paths into directories with file counts; glob filters paths.

Per-line blame of a postgres file at any commit (code-history index): the commit that wrote each line, as git blame with git's default diff. ignore_revs (default true) passes through the pgindent/reformat commits of .git-blame-ignore-revs when they replaced lines one-for-one; reverse adds the commit that removed each line later on the version's branch. At most 2000 lines per call; commits lists

One postgres commit from the code-history index: message, parsed trailers (names only), Discussion threads (links to the archived thread on /m/), back-patch siblings on other branches, first_releases (per branch the change landed on: sha, release such as 14.23, first_version incl. betas, shipped=false when reverted before that release; null release = not yet released), reverted_by and reverts, fil

Search postgres commits (code-history index), newest first, like git log: range (a rev, or A..B; default the newest release branch), message (regex, case-insensitive), author (regex over author, committer and Author/Co-authored-by/Reviewed-by trailers), paths, since/until (YYYY-MM-DD), changed_lines (a regex an added or removed line matches, as git log -G) and occurrences (a string whose count in