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fix(mcp): repair bcb_focus, make the public contract honest, rewrite the landing - #61
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Three defects found by probing the live public MCP at openfindata.com.br. 1. Unknown arguments were accepted silently. Calling bcb_series with `n=3` (a natural guess for `last_n`) returned 10 values and isError=None, so an agent got a wrong answer with no signal. All 10 tools now use z.strictObject, which emits additionalProperties:false and rejects the call with "Unrecognized key". 2. tesouro_siconfi(report=entes) returned 504,955 characters in one response, roughly 126k tokens, enough to blow most agent context windows. It now filters by uf/esfera/q (accent-insensitive) and returns a bounded envelope with total_matched/returned/limit/truncated, so truncation is visible. Default limit 100 brings the same call down to about 9k characters. The same envelope covers rreo/rgf, which could silently cut at 2000 rows. 3. bcb_ptax returned a bare [] for weekends, holidays, future dates and before the ~13h BRT publication, all indistinguishable. Day and period queries now return a consistent envelope, and an empty one carries a reason field: non_business_day, not_published_yet, future_date or no_quote_for_date. Also adds public/llms.txt and rewrites the landing page to explain what MCP is for readers who do not already know, with concrete example questions, a tool table and explicit limits. Drops the "pip install openfindata" line, which was false: the package is not on PyPI under that name or findata-br. Verified against a local wrangler dev: 10/10 tools strict, unknown key rejected, last_n=3 still returns 3, entes 504,955 -> 9,019 chars, accent insensitive lookup resolves Varzea Grande, and all four PTAX reasons fire correctly. Worker suite 29/29. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
… tests
bcb_focus was broken on every path in production. `URLSearchParams`
serialises a space as `+`, and BCB's Olinda OData gateway does not decode
`+` inside a query option, so `$orderby=Data desc` arrived as `Data+desc`
and Olinda answered 400. Every branch of the tool sends that `$orderby`,
so all five paths failed. `lib/http.ts` now re-encodes those spaces as
`%20` in a `buildUrl` helper. Verified against the live gateway: literal
space and `%20` return 200, `+` returns 400.
BCB's SGS gateway answers HTTP 200 with an HTML error page when it is
degraded. The worker surfaced the raw parser message
("Unexpected token '<'"), which tells an agent nothing. `parseJsonBody`
now names the condition and quotes the first bytes.
Follow-ups from the MCP Trust review:
- MT-1: document the Worker response contract in docs/MCP_SURFACE.md and
flag the divergence from the Python surface.
- MT-2: cover the envelope, the accent-insensitive filter and the PTAX
empty-day reasons in tests (29 -> 44 passing).
- MT-3: `brtNow`/`emptyDayReason` move to lib/ptaxDay.ts and take an
injectable clock, so the reasons are testable without wall time.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
…anding The landing page contract test requires these three disclosures and the rewritten page had dropped them. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Adversarial review (GPT-6 Astra xhigh, cross-family) found three real
defects in the previous commits.
1. `truncated: false` could certify an incomplete result. `paginate`
dropped SICONFI's `hasMore` when it hit the page cap, so a report cut
short by `MAX_PAGES_REPORT = 1` still reported an exact `total_matched`
and `truncated: false`. It now returns `{rows, complete}`, and the
envelope carries `upstream_complete`. `truncated` is true whenever the
response was cut to `limit` OR the upstream was not exhausted.
2. `limit` accepted up to 6000, which rebuilt the ~500 KB payload this
branch set out to bound, and the hint told the agent to raise it.
`limit` is capped at 2000 and the hint now points at the filters.
3. An empty PTAX range returned a bare envelope with no `reason`, while
the tool description promised one whenever `count` is 0. Ranges now
resolve to `no_quotes_in_range`; a range is not classified with a
single day's diagnosis.
Also from the review: `parseJsonBody` raised `UpstreamLimitError`, which
was the wrong class and dropped the cause. It raises `UpstreamFormatError`
with `{cause}`. And the pre-13h PTAX note asserted a cause the clock
cannot establish, so it now suggests rather than states, and mentions the
holiday case.
node:test 44 -> 48 passing.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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| Check name | Status | Explanation | Resolution |
|---|---|---|---|
| Docstring Coverage |  |
Docstring coverage is 43.75% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 16 functions across 6 files. (4 skipped: … | Write docstrings for the functions missing them to satisfy the coverage threshold. |
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Check name Status Explanation Description Check Check skipped - CodeRabbit’s high-level summary is enabled. Title check The title accurately summarizes the main changes: repairing bcb_focus, clarifying the public MCP contract, and rewriting the landing page. Linked Issues check Check skipped because no linked issues were found for this pull request. Out of Scope Changes check Check skipped because no linked issues were found for this pull request.
Full details: Docstring Coverage
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Explanation
Docstring coverage is 43.75% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 16 functions across 6 files. (4 skipped: 4 unsupported.)
Resolution
Write docstrings for the functions missing them to satisfy the coverage threshold.
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Actionable comments posted: 4
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Inline comments:
Review comments at @workers/mcp/public/index.html:
- Line 240: Update the `tesouro_siconfi` description to say results are limited
and may be incomplete, without implying callers can fetch another page; direct
callers to narrow `entes` using its filters.
- Line 185: Update the connection instructions under the “Claude Desktop, Claude
Code, Cursor e similares” heading so the JSON URL entry includes the HTTP
transport type for Claude Code, and provide separate URL-entry steps for Claude
Desktop’s custom-connector interface. Apply the same transport-type update to
the matching URL-only example in llms.txt.
Review comments at @workers/mcp/public/llms.txt:
- Around line 33-34: Update the pagination guidance in the llms.txt response
documentation to explain that increasing `limit` cannot recover pages beyond the
upstream fetch cap and that `limit` is capped at 2000. Document
`upstream_complete`, and clarify that `total_matched` is not a global total when
it is false.
Review comments at @workers/mcp/src/server.ts:
- Around line 50-53: Update the `bcb_ptax` tool description to list
`no_quotes_in_range` as the reason for an empty range query, distinguishing it
from the existing date-query reasons while preserving the empty-list behavior.
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📒 Files selected for processing: 10
docs/MCP_SURFACE.mdworkers/mcp/package.jsonworkers/mcp/public/index.htmlworkers/mcp/public/llms.txtworkers/mcp/src/lib/http.tsworkers/mcp/src/lib/ptaxDay.tsworkers/mcp/src/server.tsworkers/mcp/src/tools/bcb.tsworkers/mcp/src/tools/contract.test.tsworkers/mcp/src/tools/tesouro.ts
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…nt setup From CodeRabbit review on #61. All four were real. - `bcb_ptax` can return `no_quotes_in_range`, which the tool description did not list. An agent reads that description as the contract, so it got a value the contract denied. Now split by day and range. - The landing and llms.txt called long responses "paginada". There is no page or offset argument, so that told readers to continue through results they cannot reach. They are bounded, not paginated. - Neither file documented `upstream_complete`, added in the previous commit, nor said that raising `limit` cannot recover rows the upstream never delivered. - The connection JSON omitted `"type": "http"`, so Claude Code treats the entry as a local server and ignores the URL. Claude Desktop does not take a remote server from that JSON at all; it needs the custom connector screen. Both documented separately. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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Por que
Testei o MCP público em produção tool por tool. Quatro defeitos reais, todos confirmados contra o servidor ao vivo.
bcb_focusquebrado em todos os 5 caminhosupstream 400n=3+ param inventado → resposta normalUnrecognized key: "n", 10/10 tools comadditionalProperties:falsereport=entes= 504.955 chars (~126k tokens)uf/esfera/q[]{count, cotacoes, reason, note}O caso do
bcb_focusURLSearchParamsserializa espaço como+. O gateway OData da Olinda (BCB) não decodifica+dentro de uma query option, então$orderby=Data descchegava comoData+desce voltava 400. Todos os ramos do tool mandam esse$orderby, então o tool inteiro estava morto em produção.Verificado direto contra a Olinda:
buildUrlemlib/http.tsreencoda esses espaços como%20.Review adversarial
Cross-family (GPT-6 Astra xhigh, via wrapper). Achou três defeitos reais nos meus próprios commits, todos corrigidos neste PR:
truncated: falsecertificava resultado incompleto.paginatedescartava ohasMoredo SICONFI ao bater o cap de páginas, então um relatório cortado porMAX_PAGES_REPORT = 1ainda reportavatotal_matchedexato etruncated: false. Agora o envelope carregaupstream_complete, etruncatedé verdadeiro se a resposta foi cortada ou o upstream não foi esgotado.limitaceitava até 6000, o que reconstruía exatamente o payload de ~500 KB que o PR existe para limitar, e ohintainda mandava o agente aumentar olimit. Cap em 2000, hint aponta para os filtros.reason, apesar da descrição do tool prometer um sempre quecountfor 0. Agora resolve parano_quotes_in_range(um range não pode ser diagnosticado com o motivo de um único dia).Verificação
scripts/ship/preflight.sh: ruff format, ruff check, mypy --strict (91 arquivos), pytest 369 passed.npm testno worker: 29 → 48 assertions.wrangler devdepois de cada refactor.Landing page
Reescrita para o público que vai receber isso (ligas de mercado financeiro, não devs sênior): o que é MCP, perguntas de exemplo, tabela das 10 tools, o que o serviço não faz, limites. Removida a linha falsa
pip install openfindata(o pacote não existe no PyPI). Novopublic/llms.txtpara descoberta.Fora de escopo
bcb_seriesestá falhando por outage do upstream: o SGS do BCB responde HTTP 200 com página HTML de erro para toda série, e leva ~20s (o timeout do worker é 15s). Não é regressão deste branch, reproduzido igual em produção. O PR melhora o sintoma (parseJsonBodynomeia a condição em vez de vazarUnexpected token '<'), mas não conserta o BCB.mcp_app.py(mesmos nomes de tool, contratos diferentes) está documentada emdocs/MCP_SURFACE.md, não resolvida.🤖 Generated with Claude Code
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